Actual source code: section.c
1: /*
2: This file contains routines for basic section object implementation.
3: */
5: #include <petsc/private/sectionimpl.h>
6: #include <petscsf.h>
8: PetscClassId PETSC_SECTION_CLASSID;
10: /*@
11: PetscSectionCreate - Allocates a `PetscSection` and sets the map contents to the default.
13: Collective
15: Input Parameters:
16: + comm - the MPI communicator
17: - s - pointer to the section
19: Level: beginner
21: Notes:
22: Typical calling sequence
23: .vb
24: PetscSectionCreate(MPI_Comm,PetscSection *);!
25: PetscSectionSetNumFields(PetscSection, numFields);
26: PetscSectionSetChart(PetscSection,low,high);
27: PetscSectionSetDof(PetscSection,point,numdof);
28: PetscSectionSetUp(PetscSection);
29: PetscSectionGetOffset(PetscSection,point,PetscInt *);
30: PetscSectionDestroy(PetscSection);
31: .ve
33: The `PetscSection` object and methods are intended to be used in the PETSc `Vec` and `Mat` implementations. The indices returned by the `PetscSection` are appropriate for the kind of `Vec` it is associated with. For example, if the vector being indexed is a local vector, we call the section a local section. If the section indexes a global vector, we call it a global section. For parallel vectors, like global vectors, we use negative indices to indicate dofs owned by other processes.
35: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetChart()`, `PetscSectionDestroy()`, `PetscSectionCreateGlobalSection()`
36: @*/
37: PetscErrorCode PetscSectionCreate(MPI_Comm comm, PetscSection *s)
38: {
39: PetscFunctionBegin;
40: PetscAssertPointer(s, 2);
41: PetscCall(ISInitializePackage());
43: PetscCall(PetscHeaderCreate(*s, PETSC_SECTION_CLASSID, "PetscSection", "Section", "IS", comm, PetscSectionDestroy, PetscSectionView));
44: (*s)->pStart = -1;
45: (*s)->pEnd = -1;
46: (*s)->perm = NULL;
47: (*s)->pointMajor = PETSC_TRUE;
48: (*s)->includesConstraints = PETSC_TRUE;
49: (*s)->atlasDof = NULL;
50: (*s)->atlasOff = NULL;
51: (*s)->bc = NULL;
52: (*s)->bcIndices = NULL;
53: (*s)->setup = PETSC_FALSE;
54: (*s)->numFields = 0;
55: (*s)->fieldNames = NULL;
56: (*s)->field = NULL;
57: (*s)->useFieldOff = PETSC_FALSE;
58: (*s)->compNames = NULL;
59: (*s)->clObj = NULL;
60: (*s)->clHash = NULL;
61: (*s)->clSection = NULL;
62: (*s)->clPoints = NULL;
63: PetscCall(PetscSectionInvalidateMaxDof_Internal(*s));
64: PetscFunctionReturn(PETSC_SUCCESS);
65: }
67: /*@
68: PetscSectionCopy - Creates a shallow (if possible) copy of the `PetscSection`
70: Collective
72: Input Parameter:
73: . section - the `PetscSection`
75: Output Parameter:
76: . newSection - the copy
78: Level: intermediate
80: Developer Notes:
81: What exactly does shallow mean in this context?
83: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionDestroy()`
84: @*/
85: PetscErrorCode PetscSectionCopy(PetscSection section, PetscSection newSection)
86: {
87: PetscFunctionBegin;
90: PetscCall(PetscSectionCopy_Internal(section, newSection, NULL));
91: PetscFunctionReturn(PETSC_SUCCESS);
92: }
94: PetscErrorCode PetscSectionCopy_Internal(PetscSection section, PetscSection newSection, PetscBT constrained_dofs)
95: {
96: PetscSectionSym sym;
97: IS perm;
98: PetscInt numFields, f, c, pStart, pEnd, p;
100: PetscFunctionBegin;
103: PetscCall(PetscSectionReset(newSection));
104: PetscCall(PetscSectionGetNumFields(section, &numFields));
105: if (numFields) PetscCall(PetscSectionSetNumFields(newSection, numFields));
106: for (f = 0; f < numFields; ++f) {
107: const char *fieldName = NULL, *compName = NULL;
108: PetscInt numComp = 0;
110: PetscCall(PetscSectionGetFieldName(section, f, &fieldName));
111: PetscCall(PetscSectionSetFieldName(newSection, f, fieldName));
112: PetscCall(PetscSectionGetFieldComponents(section, f, &numComp));
113: PetscCall(PetscSectionSetFieldComponents(newSection, f, numComp));
114: for (c = 0; c < numComp; ++c) {
115: PetscCall(PetscSectionGetComponentName(section, f, c, &compName));
116: PetscCall(PetscSectionSetComponentName(newSection, f, c, compName));
117: }
118: PetscCall(PetscSectionGetFieldSym(section, f, &sym));
119: PetscCall(PetscSectionSetFieldSym(newSection, f, sym));
120: }
121: PetscCall(PetscSectionGetChart(section, &pStart, &pEnd));
122: PetscCall(PetscSectionSetChart(newSection, pStart, pEnd));
123: PetscCall(PetscSectionGetPermutation(section, &perm));
124: PetscCall(PetscSectionSetPermutation(newSection, perm));
125: PetscCall(PetscSectionGetSym(section, &sym));
126: PetscCall(PetscSectionSetSym(newSection, sym));
127: for (p = pStart; p < pEnd; ++p) {
128: PetscInt dof, cdof, fcdof = 0;
129: PetscBool force_constrained = (PetscBool)(constrained_dofs && PetscBTLookup(constrained_dofs, p - pStart));
131: PetscCall(PetscSectionGetDof(section, p, &dof));
132: PetscCall(PetscSectionSetDof(newSection, p, dof));
133: if (force_constrained) cdof = dof;
134: else PetscCall(PetscSectionGetConstraintDof(section, p, &cdof));
135: if (cdof) PetscCall(PetscSectionSetConstraintDof(newSection, p, cdof));
136: for (f = 0; f < numFields; ++f) {
137: PetscCall(PetscSectionGetFieldDof(section, p, f, &dof));
138: PetscCall(PetscSectionSetFieldDof(newSection, p, f, dof));
139: if (cdof) {
140: if (force_constrained) fcdof = dof;
141: else PetscCall(PetscSectionGetFieldConstraintDof(section, p, f, &fcdof));
142: if (fcdof) PetscCall(PetscSectionSetFieldConstraintDof(newSection, p, f, fcdof));
143: }
144: }
145: }
146: PetscCall(PetscSectionSetUp(newSection));
147: for (p = pStart; p < pEnd; ++p) {
148: PetscInt off, cdof, fcdof = 0;
149: const PetscInt *cInd;
150: PetscBool force_constrained = (PetscBool)(constrained_dofs && PetscBTLookup(constrained_dofs, p - pStart));
152: /* Must set offsets in case they do not agree with the prefix sums */
153: PetscCall(PetscSectionGetOffset(section, p, &off));
154: PetscCall(PetscSectionSetOffset(newSection, p, off));
155: PetscCall(PetscSectionGetConstraintDof(newSection, p, &cdof));
156: if (cdof) {
157: if (force_constrained) cInd = NULL;
158: else PetscCall(PetscSectionGetConstraintIndices(section, p, &cInd));
159: PetscCall(PetscSectionSetConstraintIndices(newSection, p, cInd));
160: for (f = 0; f < numFields; ++f) {
161: PetscCall(PetscSectionGetFieldOffset(section, p, f, &off));
162: PetscCall(PetscSectionSetFieldOffset(newSection, p, f, off));
163: PetscCall(PetscSectionGetFieldConstraintDof(newSection, p, f, &fcdof));
164: if (fcdof) {
165: if (force_constrained) cInd = NULL;
166: else PetscCall(PetscSectionGetFieldConstraintIndices(section, p, f, &cInd));
167: PetscCall(PetscSectionSetFieldConstraintIndices(newSection, p, f, cInd));
168: }
169: }
170: }
171: }
172: PetscFunctionReturn(PETSC_SUCCESS);
173: }
175: /*@
176: PetscSectionClone - Creates a shallow (if possible) copy of the `PetscSection`
178: Collective
180: Input Parameter:
181: . section - the `PetscSection`
183: Output Parameter:
184: . newSection - the copy
186: Level: beginner
188: Developer Notes:
189: With standard PETSc terminology this should be called `PetscSectionDuplicate()`
191: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionDestroy()`, `PetscSectionCopy()`
192: @*/
193: PetscErrorCode PetscSectionClone(PetscSection section, PetscSection *newSection)
194: {
195: PetscFunctionBegin;
197: PetscAssertPointer(newSection, 2);
198: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)section), newSection));
199: PetscCall(PetscSectionCopy(section, *newSection));
200: PetscFunctionReturn(PETSC_SUCCESS);
201: }
203: /*@
204: PetscSectionSetFromOptions - sets parameters in a `PetscSection` from the options database
206: Collective
208: Input Parameter:
209: . s - the `PetscSection`
211: Options Database Key:
212: . -petscsection_point_major - `PETSC_TRUE` for point-major order
214: Level: intermediate
216: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionDestroy()`
217: @*/
218: PetscErrorCode PetscSectionSetFromOptions(PetscSection s)
219: {
220: PetscFunctionBegin;
222: PetscObjectOptionsBegin((PetscObject)s);
223: PetscCall(PetscOptionsBool("-petscsection_point_major", "The for ordering, either point major or field major", "PetscSectionSetPointMajor", s->pointMajor, &s->pointMajor, NULL));
224: /* process any options handlers added with PetscObjectAddOptionsHandler() */
225: PetscCall(PetscObjectProcessOptionsHandlers((PetscObject)s, PetscOptionsObject));
226: PetscOptionsEnd();
227: PetscCall(PetscObjectViewFromOptions((PetscObject)s, NULL, "-petscsection_view"));
228: PetscFunctionReturn(PETSC_SUCCESS);
229: }
231: /*@
232: PetscSectionCompare - Compares two sections
234: Collective
236: Input Parameters:
237: + s1 - the first `PetscSection`
238: - s2 - the second `PetscSection`
240: Output Parameter:
241: . congruent - `PETSC_TRUE` if the two sections are congruent, `PETSC_FALSE` otherwise
243: Level: intermediate
245: Note:
246: Field names are disregarded.
248: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionCopy()`, `PetscSectionClone()`
249: @*/
250: PetscErrorCode PetscSectionCompare(PetscSection s1, PetscSection s2, PetscBool *congruent)
251: {
252: PetscInt pStart, pEnd, nfields, ncdof, nfcdof, p, f, n1, n2;
253: const PetscInt *idx1, *idx2;
254: IS perm1, perm2;
255: PetscBool flg;
256: PetscMPIInt mflg;
258: PetscFunctionBegin;
261: PetscAssertPointer(congruent, 3);
262: flg = PETSC_FALSE;
264: PetscCallMPI(MPI_Comm_compare(PetscObjectComm((PetscObject)s1), PetscObjectComm((PetscObject)s2), &mflg));
265: if (mflg != MPI_CONGRUENT && mflg != MPI_IDENT) {
266: *congruent = PETSC_FALSE;
267: PetscFunctionReturn(PETSC_SUCCESS);
268: }
270: PetscCall(PetscSectionGetChart(s1, &pStart, &pEnd));
271: PetscCall(PetscSectionGetChart(s2, &n1, &n2));
272: if (pStart != n1 || pEnd != n2) goto not_congruent;
274: PetscCall(PetscSectionGetPermutation(s1, &perm1));
275: PetscCall(PetscSectionGetPermutation(s2, &perm2));
276: if (perm1 && perm2) {
277: PetscCall(ISEqual(perm1, perm2, congruent));
278: if (!*congruent) goto not_congruent;
279: } else if (perm1 != perm2) goto not_congruent;
281: for (p = pStart; p < pEnd; ++p) {
282: PetscCall(PetscSectionGetOffset(s1, p, &n1));
283: PetscCall(PetscSectionGetOffset(s2, p, &n2));
284: if (n1 != n2) goto not_congruent;
286: PetscCall(PetscSectionGetDof(s1, p, &n1));
287: PetscCall(PetscSectionGetDof(s2, p, &n2));
288: if (n1 != n2) goto not_congruent;
290: PetscCall(PetscSectionGetConstraintDof(s1, p, &ncdof));
291: PetscCall(PetscSectionGetConstraintDof(s2, p, &n2));
292: if (ncdof != n2) goto not_congruent;
294: PetscCall(PetscSectionGetConstraintIndices(s1, p, &idx1));
295: PetscCall(PetscSectionGetConstraintIndices(s2, p, &idx2));
296: PetscCall(PetscArraycmp(idx1, idx2, ncdof, congruent));
297: if (!*congruent) goto not_congruent;
298: }
300: PetscCall(PetscSectionGetNumFields(s1, &nfields));
301: PetscCall(PetscSectionGetNumFields(s2, &n2));
302: if (nfields != n2) goto not_congruent;
304: for (f = 0; f < nfields; ++f) {
305: PetscCall(PetscSectionGetFieldComponents(s1, f, &n1));
306: PetscCall(PetscSectionGetFieldComponents(s2, f, &n2));
307: if (n1 != n2) goto not_congruent;
309: for (p = pStart; p < pEnd; ++p) {
310: PetscCall(PetscSectionGetFieldOffset(s1, p, f, &n1));
311: PetscCall(PetscSectionGetFieldOffset(s2, p, f, &n2));
312: if (n1 != n2) goto not_congruent;
314: PetscCall(PetscSectionGetFieldDof(s1, p, f, &n1));
315: PetscCall(PetscSectionGetFieldDof(s2, p, f, &n2));
316: if (n1 != n2) goto not_congruent;
318: PetscCall(PetscSectionGetFieldConstraintDof(s1, p, f, &nfcdof));
319: PetscCall(PetscSectionGetFieldConstraintDof(s2, p, f, &n2));
320: if (nfcdof != n2) goto not_congruent;
322: PetscCall(PetscSectionGetFieldConstraintIndices(s1, p, f, &idx1));
323: PetscCall(PetscSectionGetFieldConstraintIndices(s2, p, f, &idx2));
324: PetscCall(PetscArraycmp(idx1, idx2, nfcdof, congruent));
325: if (!*congruent) goto not_congruent;
326: }
327: }
329: flg = PETSC_TRUE;
330: not_congruent:
331: PetscCallMPI(MPIU_Allreduce(&flg, congruent, 1, MPI_C_BOOL, MPI_LAND, PetscObjectComm((PetscObject)s1)));
332: PetscFunctionReturn(PETSC_SUCCESS);
333: }
335: /*@
336: PetscSectionGetNumFields - Returns the number of fields in a `PetscSection`, or 0 if no fields were defined.
338: Not Collective
340: Input Parameter:
341: . s - the `PetscSection`
343: Output Parameter:
344: . numFields - the number of fields defined, or 0 if none were defined
346: Level: intermediate
348: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetNumFields()`
349: @*/
350: PetscErrorCode PetscSectionGetNumFields(PetscSection s, PetscInt *numFields)
351: {
352: PetscFunctionBegin;
354: PetscAssertPointer(numFields, 2);
355: *numFields = s->numFields;
356: PetscFunctionReturn(PETSC_SUCCESS);
357: }
359: /*@
360: PetscSectionSetNumFields - Sets the number of fields in a `PetscSection`
362: Not Collective
364: Input Parameters:
365: + s - the `PetscSection`
366: - numFields - the number of fields
368: Level: intermediate
370: Notes:
371: Calling this destroys all the information in the `PetscSection` including the chart.
373: You must call `PetscSectionSetChart()` after calling this.
375: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetNumFields()`, `PetscSectionSetChart()`, `PetscSectionReset()`
376: @*/
377: PetscErrorCode PetscSectionSetNumFields(PetscSection s, PetscInt numFields)
378: {
379: PetscInt f;
381: PetscFunctionBegin;
383: PetscCheck(numFields > 0, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "The number of fields %" PetscInt_FMT " must be positive", numFields);
384: PetscCall(PetscSectionReset(s));
386: s->numFields = numFields;
387: PetscCall(PetscMalloc1(s->numFields, &s->numFieldComponents));
388: PetscCall(PetscMalloc1(s->numFields, &s->fieldNames));
389: PetscCall(PetscMalloc1(s->numFields, &s->compNames));
390: PetscCall(PetscMalloc1(s->numFields, &s->field));
391: for (f = 0; f < s->numFields; ++f) {
392: char name[64];
394: s->numFieldComponents[f] = 1;
396: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), &s->field[f]));
397: PetscCall(PetscSNPrintf(name, 64, "Field_%" PetscInt_FMT, f));
398: PetscCall(PetscStrallocpy(name, &s->fieldNames[f]));
399: PetscCall(PetscSNPrintf(name, 64, "Component_0"));
400: PetscCall(PetscMalloc1(s->numFieldComponents[f], &s->compNames[f]));
401: PetscCall(PetscStrallocpy(name, &s->compNames[f][0]));
402: }
403: PetscFunctionReturn(PETSC_SUCCESS);
404: }
406: /*@
407: PetscSectionGetFieldName - Returns the name of a field in the `PetscSection`
409: Not Collective
411: Input Parameters:
412: + s - the `PetscSection`
413: - field - the field number
415: Output Parameter:
416: . fieldName - the field name
418: Level: intermediate
420: Note:
421: Will error if the field number is out of range
423: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetFieldName()`, `PetscSectionSetNumFields()`, `PetscSectionGetNumFields()`
424: @*/
425: PetscErrorCode PetscSectionGetFieldName(PetscSection s, PetscInt field, const char *fieldName[])
426: {
427: PetscFunctionBegin;
429: PetscAssertPointer(fieldName, 3);
430: PetscSectionCheckValidField(field, s->numFields);
431: *fieldName = s->fieldNames[field];
432: PetscFunctionReturn(PETSC_SUCCESS);
433: }
435: /*@
436: PetscSectionSetFieldName - Sets the name of a field in the `PetscSection`
438: Not Collective
440: Input Parameters:
441: + s - the `PetscSection`
442: . field - the field number
443: - fieldName - the field name
445: Level: intermediate
447: Note:
448: Will error if the field number is out of range
450: .seealso: [PetscSection](ch_petscsection), `PetscSectionGetFieldName()`, `PetscSectionSetNumFields()`, `PetscSectionGetNumFields()`
451: @*/
452: PetscErrorCode PetscSectionSetFieldName(PetscSection s, PetscInt field, const char fieldName[])
453: {
454: PetscFunctionBegin;
456: if (fieldName) PetscAssertPointer(fieldName, 3);
457: PetscSectionCheckValidField(field, s->numFields);
458: PetscCall(PetscFree(s->fieldNames[field]));
459: PetscCall(PetscStrallocpy(fieldName, &s->fieldNames[field]));
460: PetscFunctionReturn(PETSC_SUCCESS);
461: }
463: /*@
464: PetscSectionGetComponentName - Gets the name of a field component in the `PetscSection`
466: Not Collective
468: Input Parameters:
469: + s - the `PetscSection`
470: . field - the field number
471: - comp - the component number
473: Output Parameter:
474: . compName - the component name
476: Level: intermediate
478: Note:
479: Will error if the field or component number do not exist
481: Developer Notes:
482: The function name should have Field in it since they are field components.
484: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldName()`, `PetscSectionSetNumFields()`, `PetscSectionGetNumFields()`,
485: `PetscSectionSetComponentName()`, `PetscSectionSetFieldName()`, `PetscSectionGetFieldComponents()`, `PetscSectionSetFieldComponents()`
486: @*/
487: PetscErrorCode PetscSectionGetComponentName(PetscSection s, PetscInt field, PetscInt comp, const char *compName[])
488: {
489: PetscFunctionBegin;
491: PetscAssertPointer(compName, 4);
492: PetscSectionCheckValidField(field, s->numFields);
493: PetscSectionCheckValidFieldComponent(comp, s->numFieldComponents[field]);
494: *compName = s->compNames[field][comp];
495: PetscFunctionReturn(PETSC_SUCCESS);
496: }
498: /*@
499: PetscSectionSetComponentName - Sets the name of a field component in the `PetscSection`
501: Not Collective
503: Input Parameters:
504: + s - the `PetscSection`
505: . field - the field number
506: . comp - the component number
507: - compName - the component name
509: Level: advanced
511: Note:
512: Will error if the field or component number do not exist
514: Developer Notes:
515: The function name should have Field in it since they are field components.
517: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetComponentName()`, `PetscSectionSetNumFields()`, `PetscSectionGetNumFields()`,
518: `PetscSectionSetFieldName()`, `PetscSectionGetFieldComponents()`, `PetscSectionSetFieldComponents()`
519: @*/
520: PetscErrorCode PetscSectionSetComponentName(PetscSection s, PetscInt field, PetscInt comp, const char compName[])
521: {
522: PetscFunctionBegin;
524: if (compName) PetscAssertPointer(compName, 4);
525: PetscSectionCheckValidField(field, s->numFields);
526: PetscSectionCheckValidFieldComponent(comp, s->numFieldComponents[field]);
527: PetscCall(PetscFree(s->compNames[field][comp]));
528: PetscCall(PetscStrallocpy(compName, &s->compNames[field][comp]));
529: PetscFunctionReturn(PETSC_SUCCESS);
530: }
532: /*@
533: PetscSectionGetFieldComponents - Returns the number of field components for the given field.
535: Not Collective
537: Input Parameters:
538: + s - the `PetscSection`
539: - field - the field number
541: Output Parameter:
542: . numComp - the number of field components
544: Level: advanced
546: Developer Notes:
547: This function is misnamed. There is a Num in `PetscSectionGetNumFields()` but not in this name
549: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetFieldComponents()`, `PetscSectionGetNumFields()`,
550: `PetscSectionSetComponentName()`, `PetscSectionGetComponentName()`
551: @*/
552: PetscErrorCode PetscSectionGetFieldComponents(PetscSection s, PetscInt field, PetscInt *numComp)
553: {
554: PetscFunctionBegin;
556: PetscAssertPointer(numComp, 3);
557: PetscSectionCheckValidField(field, s->numFields);
558: *numComp = s->numFieldComponents[field];
559: PetscFunctionReturn(PETSC_SUCCESS);
560: }
562: /*@
563: PetscSectionSetFieldComponents - Sets the number of field components for the given field.
565: Not Collective
567: Input Parameters:
568: + s - the `PetscSection`
569: . field - the field number
570: - numComp - the number of field components
572: Level: advanced
574: Note:
575: This number can be different than the values set with `PetscSectionSetFieldDof()`. It can be used to indicate the number of
576: components in the field of the underlying physical model which may be different than the number of degrees of freedom needed
577: at a point in a discretization. For example, if in three dimensions the field is velocity, it will have 3 components, u, v, and w but
578: an face based model for velocity (where the velocity normal to the face is stored) there is only 1 dof for each face point.
580: The value set with this function are not needed or used in `PetscSectionSetUp()`.
582: Developer Notes:
583: This function is misnamed. There is a Num in `PetscSectionSetNumFields()` but not in this name
585: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldComponents()`, `PetscSectionSetComponentName()`,
586: `PetscSectionGetComponentName()`, `PetscSectionGetNumFields()`
587: @*/
588: PetscErrorCode PetscSectionSetFieldComponents(PetscSection s, PetscInt field, PetscInt numComp)
589: {
590: PetscInt c;
592: PetscFunctionBegin;
594: PetscSectionCheckValidField(field, s->numFields);
595: if (s->compNames) {
596: for (c = 0; c < s->numFieldComponents[field]; ++c) PetscCall(PetscFree(s->compNames[field][c]));
597: PetscCall(PetscFree(s->compNames[field]));
598: }
600: s->numFieldComponents[field] = numComp;
601: if (numComp) {
602: PetscCall(PetscMalloc1(numComp, &s->compNames[field]));
603: for (c = 0; c < numComp; ++c) {
604: char name[64];
606: PetscCall(PetscSNPrintf(name, 64, "%" PetscInt_FMT, c));
607: PetscCall(PetscStrallocpy(name, &s->compNames[field][c]));
608: }
609: }
610: PetscFunctionReturn(PETSC_SUCCESS);
611: }
613: /*@
614: PetscSectionGetChart - Returns the range [`pStart`, `pEnd`) in which points (indices) lie for this `PetscSection` on this MPI process
616: Not Collective
618: Input Parameter:
619: . s - the `PetscSection`
621: Output Parameters:
622: + pStart - the first point
623: - pEnd - one past the last point
625: Level: intermediate
627: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetChart()`, `PetscSectionCreate()`
628: @*/
629: PetscErrorCode PetscSectionGetChart(PetscSection s, PetscInt *pStart, PetscInt *pEnd)
630: {
631: PetscFunctionBegin;
633: if (pStart) *pStart = s->pStart;
634: if (pEnd) *pEnd = s->pEnd;
635: PetscFunctionReturn(PETSC_SUCCESS);
636: }
638: /*@
639: PetscSectionSetChart - Sets the range [`pStart`, `pEnd`) in which points (indices) lie for this `PetscSection` on this MPI process
641: Not Collective
643: Input Parameters:
644: + s - the `PetscSection`
645: . pStart - the first point
646: - pEnd - one past the last point, `pStart` $ \le $ `pEnd`
648: Level: intermediate
650: Notes:
651: The charts on different MPI processes may (and often do) overlap
653: If you intend to use `PetscSectionSetNumFields()` it must be called before this call.
655: The chart for all fields created with `PetscSectionSetNumFields()` is the same as this chart.
657: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetChart()`, `PetscSectionCreate()`, `PetscSectionSetNumFields()`
658: @*/
659: PetscErrorCode PetscSectionSetChart(PetscSection s, PetscInt pStart, PetscInt pEnd)
660: {
661: PetscInt f;
663: PetscFunctionBegin;
665: PetscCheck(pEnd >= pStart, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Chart pEnd %" PetscInt_FMT " cannot be smaller than chart pStart %" PetscInt_FMT, pEnd, pStart);
666: if (pStart == s->pStart && pEnd == s->pEnd) PetscFunctionReturn(PETSC_SUCCESS);
667: /* Cannot Reset() because it destroys field information */
668: s->setup = PETSC_FALSE;
669: PetscCall(PetscSectionDestroy(&s->bc));
670: PetscCall(PetscFree(s->bcIndices));
671: PetscCall(PetscFree2(s->atlasDof, s->atlasOff));
673: s->pStart = pStart;
674: s->pEnd = pEnd;
675: PetscCall(PetscMalloc2(pEnd - pStart, &s->atlasDof, pEnd - pStart, &s->atlasOff));
676: PetscCall(PetscArrayzero(s->atlasDof, pEnd - pStart));
677: for (f = 0; f < s->numFields; ++f) PetscCall(PetscSectionSetChart(s->field[f], pStart, pEnd));
678: PetscFunctionReturn(PETSC_SUCCESS);
679: }
681: /*@
682: PetscSectionGetPermutation - Returns the permutation of [0, `pEnd` - `pStart`) or `NULL` that was set with `PetscSectionSetPermutation()`
684: Not Collective
686: Input Parameter:
687: . s - the `PetscSection`
689: Output Parameter:
690: . perm - The permutation as an `IS`
692: Level: intermediate
694: .seealso: [](sec_scatter), `IS`, `PetscSection`, `PetscSectionSetPermutation()`, `PetscSectionCreate()`
695: @*/
696: PetscErrorCode PetscSectionGetPermutation(PetscSection s, IS *perm)
697: {
698: PetscFunctionBegin;
700: if (perm) {
701: PetscAssertPointer(perm, 2);
702: *perm = s->perm;
703: }
704: PetscFunctionReturn(PETSC_SUCCESS);
705: }
707: /*@
708: PetscSectionSetPermutation - Sets a permutation of the chart for this section, [0, `pEnd` - `pStart`), which determines the order to store the `PetscSection` information
710: Not Collective
712: Input Parameters:
713: + s - the `PetscSection`
714: - perm - the permutation of points
716: Level: intermediate
718: Notes:
719: The permutation must be provided before `PetscSectionSetUp()`.
721: The data in the `PetscSection` are permuted but the access via `PetscSectionGetFieldOffset()` and `PetscSectionGetOffset()` is not changed
723: Compare to `PetscSectionPermute()`
725: .seealso: [](sec_scatter), `IS`, `PetscSection`, `PetscSectionSetUp()`, `PetscSectionGetPermutation()`, `PetscSectionPermute()`, `PetscSectionCreate()`
726: @*/
727: PetscErrorCode PetscSectionSetPermutation(PetscSection s, IS perm)
728: {
729: PetscFunctionBegin;
732: PetscCheck(!s->setup, PetscObjectComm((PetscObject)s), PETSC_ERR_ARG_WRONGSTATE, "Cannot set a permutation after the section is setup");
733: if (s->perm != perm) {
734: PetscCall(ISDestroy(&s->perm));
735: if (perm) {
736: s->perm = perm;
737: PetscCall(PetscObjectReference((PetscObject)s->perm));
738: }
739: }
740: PetscFunctionReturn(PETSC_SUCCESS);
741: }
743: /*@C
744: PetscSectionGetBlockStarts - Returns a table indicating which points start new blocks
746: Not Collective, No Fortran Support
748: Input Parameter:
749: . s - the `PetscSection`
751: Output Parameter:
752: . blockStarts - The `PetscBT` with a 1 for each point that begins a block
754: Notes:
755: The table is on [0, `pEnd` - `pStart`).
757: This information is used by `DMCreateMatrix()` to create a variable block size description which is set using `MatSetVariableBlockSizes()`.
759: Level: intermediate
761: .seealso: [](sec_scatter), `IS`, `PetscSection`, `PetscSectionSetBlockStarts()`, `PetscSectionCreate()`, `DMCreateMatrix()`, `MatSetVariableBlockSizes()`
762: @*/
763: PetscErrorCode PetscSectionGetBlockStarts(PetscSection s, PetscBT *blockStarts)
764: {
765: PetscFunctionBegin;
767: if (blockStarts) {
768: PetscAssertPointer(blockStarts, 2);
769: *blockStarts = s->blockStarts;
770: }
771: PetscFunctionReturn(PETSC_SUCCESS);
772: }
774: /*@C
775: PetscSectionSetBlockStarts - Sets a table indicating which points start new blocks
777: Not Collective, No Fortran Support
779: Input Parameters:
780: + s - the `PetscSection`
781: - blockStarts - The `PetscBT` with a 1 for each point that begins a block
783: Level: intermediate
785: Notes:
786: The table is on [0, `pEnd` - `pStart`). PETSc takes ownership of the `PetscBT` when it is passed in and will destroy it. The user should not destroy it.
788: This information is used by `DMCreateMatrix()` to create a variable block size description which is set using `MatSetVariableBlockSizes()`.
790: .seealso: [](sec_scatter), `IS`, `PetscSection`, `PetscSectionGetBlockStarts()`, `PetscSectionCreate()`, `DMCreateMatrix()`, `MatSetVariableBlockSizes()`
791: @*/
792: PetscErrorCode PetscSectionSetBlockStarts(PetscSection s, PetscBT blockStarts)
793: {
794: PetscFunctionBegin;
796: if (s->blockStarts != blockStarts) {
797: PetscCall(PetscBTDestroy(&s->blockStarts));
798: s->blockStarts = blockStarts;
799: }
800: PetscFunctionReturn(PETSC_SUCCESS);
801: }
803: /*@
804: PetscSectionGetPointMajor - Returns the flag for dof ordering, `PETSC_TRUE` if it is point major, `PETSC_FALSE` if it is field major
806: Not Collective
808: Input Parameter:
809: . s - the `PetscSection`
811: Output Parameter:
812: . pm - the flag for point major ordering
814: Level: intermediate
816: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetPointMajor()`
817: @*/
818: PetscErrorCode PetscSectionGetPointMajor(PetscSection s, PetscBool *pm)
819: {
820: PetscFunctionBegin;
822: PetscAssertPointer(pm, 2);
823: *pm = s->pointMajor;
824: PetscFunctionReturn(PETSC_SUCCESS);
825: }
827: /*@
828: PetscSectionSetPointMajor - Sets the flag for dof ordering, `PETSC_TRUE` for point major, otherwise it will be field major
830: Not Collective
832: Input Parameters:
833: + s - the `PetscSection`
834: - pm - the flag for point major ordering
836: Level: intermediate
838: Note:
839: Field-major order is not recommended unless you are managing the entire problem yourself, since many higher-level functions in PETSc depend on point-major order.
841: Point major order means the degrees of freedom are stored as follows
842: .vb
843: all the degrees of freedom for each point are stored contiguously, one point after another (respecting a permutation set with `PetscSectionSetPermutation()`)
844: for each point
845: the degrees of freedom for each field (starting with the unnamed default field) are listed in order by field
846: .ve
848: Field major order means the degrees of freedom are stored as follows
849: .vb
850: all degrees of freedom for each field (including the unnamed default field) are stored contiguously, one field after another
851: for each field (started with unnamed default field)
852: the degrees of freedom for each point are listed in order by point (respecting a permutation set with `PetscSectionSetPermutation()`)
853: .ve
855: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetPointMajor()`, `PetscSectionSetPermutation()`
856: @*/
857: PetscErrorCode PetscSectionSetPointMajor(PetscSection s, PetscBool pm)
858: {
859: PetscFunctionBegin;
861: PetscCheck(!s->setup, PetscObjectComm((PetscObject)s), PETSC_ERR_ARG_WRONGSTATE, "Cannot set the dof ordering after the section is setup");
862: s->pointMajor = pm;
863: PetscFunctionReturn(PETSC_SUCCESS);
864: }
866: /*@
867: PetscSectionGetIncludesConstraints - Returns the flag indicating if constrained dofs were included when computing offsets in the `PetscSection`.
868: The value is set with `PetscSectionSetIncludesConstraints()`
870: Not Collective
872: Input Parameter:
873: . s - the `PetscSection`
875: Output Parameter:
876: . includesConstraints - the flag indicating if constrained dofs were included when computing offsets
878: Level: intermediate
880: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetIncludesConstraints()`
881: @*/
882: PetscErrorCode PetscSectionGetIncludesConstraints(PetscSection s, PetscBool *includesConstraints)
883: {
884: PetscFunctionBegin;
886: PetscAssertPointer(includesConstraints, 2);
887: *includesConstraints = s->includesConstraints;
888: PetscFunctionReturn(PETSC_SUCCESS);
889: }
891: /*@
892: PetscSectionSetIncludesConstraints - Sets the flag indicating if constrained dofs are to be included when computing offsets
894: Not Collective
896: Input Parameters:
897: + s - the `PetscSection`
898: - includesConstraints - the flag indicating if constrained dofs are to be included when computing offsets
900: Level: intermediate
902: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetIncludesConstraints()`
903: @*/
904: PetscErrorCode PetscSectionSetIncludesConstraints(PetscSection s, PetscBool includesConstraints)
905: {
906: PetscFunctionBegin;
908: PetscCheck(!s->setup, PetscObjectComm((PetscObject)s), PETSC_ERR_ARG_WRONGSTATE, "Cannot set includesConstraints after the section is set up");
909: s->includesConstraints = includesConstraints;
910: PetscFunctionReturn(PETSC_SUCCESS);
911: }
913: /*@
914: PetscSectionGetDof - Return the total number of degrees of freedom associated with a given point.
916: Not Collective
918: Input Parameters:
919: + s - the `PetscSection`
920: - point - the point
922: Output Parameter:
923: . numDof - the number of dof
925: Level: intermediate
927: Notes:
928: In a global section, this size will be negative for points not owned by this process.
930: This number is for the unnamed default field at the given point plus all degrees of freedom associated with all fields at that point
932: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetDof()`, `PetscSectionCreate()`
933: @*/
934: PetscErrorCode PetscSectionGetDof(PetscSection s, PetscInt point, PetscInt *numDof)
935: {
936: PetscFunctionBeginHot;
938: PetscAssertPointer(numDof, 3);
939: PetscAssert(point >= s->pStart && point < s->pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Section point %" PetscInt_FMT " should be in [%" PetscInt_FMT ", %" PetscInt_FMT ")", point, s->pStart, s->pEnd);
940: *numDof = s->atlasDof[point - s->pStart];
941: PetscFunctionReturn(PETSC_SUCCESS);
942: }
944: /*@
945: PetscSectionSetDof - Sets the total number of degrees of freedom associated with a given point.
947: Not Collective
949: Input Parameters:
950: + s - the `PetscSection`
951: . point - the point
952: - numDof - the number of dof, these values may be negative -(dof+1) to indicate they are off process
954: Level: intermediate
956: Note:
957: This number is for the unnamed default field at the given point plus all degrees of freedom associated with all fields at that point
959: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionAddDof()`, `PetscSectionCreate()`
960: @*/
961: PetscErrorCode PetscSectionSetDof(PetscSection s, PetscInt point, PetscInt numDof)
962: {
963: PetscFunctionBegin;
965: PetscAssert(point >= s->pStart && point < s->pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Section point %" PetscInt_FMT " should be in [%" PetscInt_FMT ", %" PetscInt_FMT ")", point, s->pStart, s->pEnd);
966: s->atlasDof[point - s->pStart] = numDof;
967: PetscCall(PetscSectionInvalidateMaxDof_Internal(s));
968: PetscFunctionReturn(PETSC_SUCCESS);
969: }
971: /*@
972: PetscSectionAddDof - Adds to the total number of degrees of freedom associated with a given point.
974: Not Collective
976: Input Parameters:
977: + s - the `PetscSection`
978: . point - the point
979: - numDof - the number of additional dof
981: Level: intermediate
983: Note:
984: This number is for the unnamed default field at the given point plus all degrees of freedom associated with all fields at that point
986: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionSetDof()`, `PetscSectionCreate()`
987: @*/
988: PetscErrorCode PetscSectionAddDof(PetscSection s, PetscInt point, PetscInt numDof)
989: {
990: PetscFunctionBeginHot;
992: PetscAssert(point >= s->pStart && point < s->pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Section point %" PetscInt_FMT " should be in [%" PetscInt_FMT ", %" PetscInt_FMT ")", point, s->pStart, s->pEnd);
993: PetscCheck(numDof >= 0, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "numDof %" PetscInt_FMT " should not be negative", numDof);
994: s->atlasDof[point - s->pStart] += numDof;
995: PetscCall(PetscSectionInvalidateMaxDof_Internal(s));
996: PetscFunctionReturn(PETSC_SUCCESS);
997: }
999: /*@
1000: PetscSectionGetFieldDof - Return the number of degrees of freedom associated with a field on a given point.
1002: Not Collective
1004: Input Parameters:
1005: + s - the `PetscSection`
1006: . point - the point
1007: - field - the field
1009: Output Parameter:
1010: . numDof - the number of dof
1012: Level: intermediate
1014: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetFieldDof()`, `PetscSectionCreate()`
1015: @*/
1016: PetscErrorCode PetscSectionGetFieldDof(PetscSection s, PetscInt point, PetscInt field, PetscInt *numDof)
1017: {
1018: PetscFunctionBegin;
1020: PetscAssertPointer(numDof, 4);
1021: PetscSectionCheckValidField(field, s->numFields);
1022: PetscCall(PetscSectionGetDof(s->field[field], point, numDof));
1023: PetscFunctionReturn(PETSC_SUCCESS);
1024: }
1026: /*@
1027: PetscSectionSetFieldDof - Sets the number of degrees of freedom associated with a field on a given point.
1029: Not Collective
1031: Input Parameters:
1032: + s - the `PetscSection`
1033: . point - the point
1034: . field - the field
1035: - numDof - the number of dof, these values may be negative -(dof+1) to indicate they are off process
1037: Level: intermediate
1039: Note:
1040: When setting the number of dof for a field at a point one must also ensure the count of the total number of dof at the point (summed over
1041: the fields and the unnamed default field) is correct by also calling `PetscSectionAddDof()` or `PetscSectionSetDof()`
1043: This is equivalent to
1044: .vb
1045: PetscSection fs;
1046: PetscSectionGetField(s,field,&fs)
1047: PetscSectionSetDof(fs,numDof)
1048: .ve
1050: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldDof()`, `PetscSectionCreate()`, `PetscSectionAddDof()`, `PetscSectionSetDof()`
1051: @*/
1052: PetscErrorCode PetscSectionSetFieldDof(PetscSection s, PetscInt point, PetscInt field, PetscInt numDof)
1053: {
1054: PetscFunctionBegin;
1056: PetscSectionCheckValidField(field, s->numFields);
1057: PetscCall(PetscSectionSetDof(s->field[field], point, numDof));
1058: PetscFunctionReturn(PETSC_SUCCESS);
1059: }
1061: /*@
1062: PetscSectionAddFieldDof - Adds a number of degrees of freedom associated with a field on a given point.
1064: Not Collective
1066: Input Parameters:
1067: + s - the `PetscSection`
1068: . point - the point
1069: . field - the field
1070: - numDof - the number of dof
1072: Level: intermediate
1074: Notes:
1075: When adding to the number of dof for a field at a point one must also ensure the count of the total number of dof at the point (summed over
1076: the fields and the unnamed default field) is correct by also calling `PetscSectionAddDof()` or `PetscSectionSetDof()`
1078: This is equivalent to
1079: .vb
1080: PetscSection fs;
1081: PetscSectionGetField(s,field,&fs)
1082: PetscSectionAddDof(fs,numDof)
1083: .ve
1085: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetFieldDof()`, `PetscSectionGetFieldDof()`, `PetscSectionCreate()`
1086: @*/
1087: PetscErrorCode PetscSectionAddFieldDof(PetscSection s, PetscInt point, PetscInt field, PetscInt numDof)
1088: {
1089: PetscFunctionBegin;
1091: PetscSectionCheckValidField(field, s->numFields);
1092: PetscCall(PetscSectionAddDof(s->field[field], point, numDof));
1093: PetscFunctionReturn(PETSC_SUCCESS);
1094: }
1096: /*@
1097: PetscSectionGetConstraintDof - Return the number of constrained degrees of freedom associated with a given point.
1099: Not Collective
1101: Input Parameters:
1102: + s - the `PetscSection`
1103: - point - the point
1105: Output Parameter:
1106: . numDof - the number of dof which are fixed by constraints
1108: Level: intermediate
1110: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionSetConstraintDof()`, `PetscSectionCreate()`
1111: @*/
1112: PetscErrorCode PetscSectionGetConstraintDof(PetscSection s, PetscInt point, PetscInt *numDof)
1113: {
1114: PetscFunctionBegin;
1116: PetscAssertPointer(numDof, 3);
1117: if (s->bc) PetscCall(PetscSectionGetDof(s->bc, point, numDof));
1118: else *numDof = 0;
1119: PetscFunctionReturn(PETSC_SUCCESS);
1120: }
1122: /*@
1123: PetscSectionSetConstraintDof - Set the number of constrained degrees of freedom associated with a given point.
1125: Not Collective
1127: Input Parameters:
1128: + s - the `PetscSection`
1129: . point - the point
1130: - numDof - the number of dof which are fixed by constraints
1132: Level: intermediate
1134: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetDof()`, `PetscSectionGetConstraintDof()`, `PetscSectionCreate()`
1135: @*/
1136: PetscErrorCode PetscSectionSetConstraintDof(PetscSection s, PetscInt point, PetscInt numDof)
1137: {
1138: PetscFunctionBegin;
1140: if (numDof) {
1141: PetscCall(PetscSectionCheckConstraints_Private(s));
1142: PetscCall(PetscSectionSetDof(s->bc, point, numDof));
1143: }
1144: PetscFunctionReturn(PETSC_SUCCESS);
1145: }
1147: /*@
1148: PetscSectionAddConstraintDof - Increment the number of constrained degrees of freedom associated with a given point.
1150: Not Collective
1152: Input Parameters:
1153: + s - the `PetscSection`
1154: . point - the point
1155: - numDof - the number of additional dof which are fixed by constraints
1157: Level: intermediate
1159: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionAddDof()`, `PetscSectionGetConstraintDof()`, `PetscSectionCreate()`
1160: @*/
1161: PetscErrorCode PetscSectionAddConstraintDof(PetscSection s, PetscInt point, PetscInt numDof)
1162: {
1163: PetscFunctionBegin;
1165: if (numDof) {
1166: PetscCall(PetscSectionCheckConstraints_Private(s));
1167: PetscCall(PetscSectionAddDof(s->bc, point, numDof));
1168: }
1169: PetscFunctionReturn(PETSC_SUCCESS);
1170: }
1172: /*@
1173: PetscSectionGetFieldConstraintDof - Return the number of constrained degrees of freedom associated with a given field on a point.
1175: Not Collective
1177: Input Parameters:
1178: + s - the `PetscSection`
1179: . point - the point
1180: - field - the field
1182: Output Parameter:
1183: . numDof - the number of dof which are fixed by constraints
1185: Level: intermediate
1187: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionSetFieldConstraintDof()`, `PetscSectionCreate()`
1188: @*/
1189: PetscErrorCode PetscSectionGetFieldConstraintDof(PetscSection s, PetscInt point, PetscInt field, PetscInt *numDof)
1190: {
1191: PetscFunctionBegin;
1193: PetscAssertPointer(numDof, 4);
1194: PetscSectionCheckValidField(field, s->numFields);
1195: PetscCall(PetscSectionGetConstraintDof(s->field[field], point, numDof));
1196: PetscFunctionReturn(PETSC_SUCCESS);
1197: }
1199: /*@
1200: PetscSectionSetFieldConstraintDof - Set the number of constrained degrees of freedom associated with a given field on a point.
1202: Not Collective
1204: Input Parameters:
1205: + s - the `PetscSection`
1206: . point - the point
1207: . field - the field
1208: - numDof - the number of dof which are fixed by constraints
1210: Level: intermediate
1212: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetDof()`, `PetscSectionGetFieldConstraintDof()`, `PetscSectionCreate()`
1213: @*/
1214: PetscErrorCode PetscSectionSetFieldConstraintDof(PetscSection s, PetscInt point, PetscInt field, PetscInt numDof)
1215: {
1216: PetscFunctionBegin;
1218: PetscSectionCheckValidField(field, s->numFields);
1219: PetscCall(PetscSectionSetConstraintDof(s->field[field], point, numDof));
1220: PetscFunctionReturn(PETSC_SUCCESS);
1221: }
1223: /*@
1224: PetscSectionAddFieldConstraintDof - Increment the number of constrained degrees of freedom associated with a given field on a point.
1226: Not Collective
1228: Input Parameters:
1229: + s - the `PetscSection`
1230: . point - the point
1231: . field - the field
1232: - numDof - the number of additional dof which are fixed by constraints
1234: Level: intermediate
1236: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionAddDof()`, `PetscSectionGetFieldConstraintDof()`, `PetscSectionCreate()`
1237: @*/
1238: PetscErrorCode PetscSectionAddFieldConstraintDof(PetscSection s, PetscInt point, PetscInt field, PetscInt numDof)
1239: {
1240: PetscFunctionBegin;
1242: PetscSectionCheckValidField(field, s->numFields);
1243: PetscCall(PetscSectionAddConstraintDof(s->field[field], point, numDof));
1244: PetscFunctionReturn(PETSC_SUCCESS);
1245: }
1247: /*@
1248: PetscSectionSetUpBC - Setup the subsections describing boundary conditions.
1250: Not Collective
1252: Input Parameter:
1253: . s - the `PetscSection`
1255: Level: advanced
1257: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSetUp()`, `PetscSectionCreate()`
1258: @*/
1259: PetscErrorCode PetscSectionSetUpBC(PetscSection s)
1260: {
1261: PetscFunctionBegin;
1263: if (s->bc) {
1264: const PetscInt last = (s->bc->pEnd - s->bc->pStart) - 1;
1266: PetscCall(PetscSectionSetUp(s->bc));
1267: if (last >= 0) PetscCall(PetscMalloc1(s->bc->atlasOff[last] + s->bc->atlasDof[last], &s->bcIndices));
1268: else s->bcIndices = NULL;
1269: }
1270: PetscFunctionReturn(PETSC_SUCCESS);
1271: }
1273: /*@
1274: PetscSectionSetUp - Calculate offsets based upon the number of degrees of freedom for each point in preparation for use of the `PetscSection`
1276: Not Collective
1278: Input Parameter:
1279: . s - the `PetscSection`
1281: Level: intermediate
1283: Notes:
1284: If used, `PetscSectionSetPermutation()` must be called before this routine.
1286: `PetscSectionSetPointMajor()`, cannot be called after this routine.
1288: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionSetPermutation()`
1289: @*/
1290: PetscErrorCode PetscSectionSetUp(PetscSection s)
1291: {
1292: PetscInt f;
1293: const PetscInt *pind = NULL;
1294: PetscCount offset = 0;
1296: PetscFunctionBegin;
1298: if (s->setup) PetscFunctionReturn(PETSC_SUCCESS);
1299: s->setup = PETSC_TRUE;
1300: /* Set offsets and field offsets for all points */
1301: /* Assume that all fields have the same chart */
1302: PetscCheck(s->includesConstraints, PETSC_COMM_SELF, PETSC_ERR_SUP, "PetscSectionSetUp is currently unsupported for includesConstraints = PETSC_TRUE");
1303: if (s->perm) PetscCall(ISGetIndices(s->perm, &pind));
1304: if (s->pointMajor) {
1305: PetscCount foff;
1306: for (PetscInt p = 0; p < s->pEnd - s->pStart; ++p) {
1307: const PetscInt q = pind ? pind[p] : p;
1309: /* Set point offset */
1310: PetscCall(PetscIntCast(offset, &s->atlasOff[q]));
1311: offset += s->atlasDof[q];
1312: /* Set field offset */
1313: for (f = 0, foff = s->atlasOff[q]; f < s->numFields; ++f) {
1314: PetscSection sf = s->field[f];
1316: PetscCall(PetscIntCast(foff, &sf->atlasOff[q]));
1317: foff += sf->atlasDof[q];
1318: }
1319: }
1320: } else {
1321: /* Set field offsets for all points */
1322: for (f = 0; f < s->numFields; ++f) {
1323: PetscSection sf = s->field[f];
1325: for (PetscInt p = 0; p < s->pEnd - s->pStart; ++p) {
1326: const PetscInt q = pind ? pind[p] : p;
1328: PetscCall(PetscIntCast(offset, &sf->atlasOff[q]));
1329: offset += sf->atlasDof[q];
1330: }
1331: }
1332: /* Disable point offsets since these are unused */
1333: for (PetscInt p = 0; p < s->pEnd - s->pStart; ++p) s->atlasOff[p] = -1;
1334: }
1335: if (s->perm) PetscCall(ISRestoreIndices(s->perm, &pind));
1336: /* Setup BC sections */
1337: PetscCall(PetscSectionSetUpBC(s));
1338: for (f = 0; f < s->numFields; ++f) PetscCall(PetscSectionSetUpBC(s->field[f]));
1339: PetscFunctionReturn(PETSC_SUCCESS);
1340: }
1342: /*@
1343: PetscSectionGetMaxDof - Return the maximum number of degrees of freedom on any point in the `PetscSection`
1345: Not Collective
1347: Input Parameter:
1348: . s - the `PetscSection`
1350: Output Parameter:
1351: . maxDof - the maximum dof
1353: Level: intermediate
1355: Notes:
1356: The returned number is up-to-date without need for `PetscSectionSetUp()`.
1358: This is the maximum over all points of the sum of the number of dof in the unnamed default field plus all named fields. This is equivalent to
1359: the maximum over all points of the value returned by `PetscSectionGetDof()` on this MPI process
1361: Developer Notes:
1362: The returned number is calculated lazily and stashed.
1364: A call to `PetscSectionInvalidateMaxDof_Internal()` invalidates the stashed value.
1366: `PetscSectionInvalidateMaxDof_Internal()` is called in `PetscSectionSetDof()`, `PetscSectionAddDof()` and `PetscSectionReset()`
1368: It should also be called every time `atlasDof` is modified directly.
1370: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetDof()`, `PetscSectionSetDof()`, `PetscSectionAddDof()`, `PetscSectionCreate()`
1371: @*/
1372: PetscErrorCode PetscSectionGetMaxDof(PetscSection s, PetscInt *maxDof)
1373: {
1374: PetscInt p;
1376: PetscFunctionBegin;
1378: PetscAssertPointer(maxDof, 2);
1379: if (s->maxDof == PETSC_INT_MIN) {
1380: s->maxDof = 0;
1381: for (p = 0; p < s->pEnd - s->pStart; ++p) s->maxDof = PetscMax(s->maxDof, s->atlasDof[p]);
1382: }
1383: *maxDof = s->maxDof;
1384: PetscFunctionReturn(PETSC_SUCCESS);
1385: }
1387: /*@
1388: PetscSectionGetStorageSize - Return the size of an array or local `Vec` capable of holding all the degrees of freedom defined in a `PetscSection`
1390: Not Collective
1392: Input Parameter:
1393: . s - the `PetscSection`
1395: Output Parameter:
1396: . size - the size of an array which can hold all the dofs
1398: Level: intermediate
1400: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetOffset()`, `PetscSectionGetConstrainedStorageSize()`, `PetscSectionCreate()`
1401: @*/
1402: PetscErrorCode PetscSectionGetStorageSize(PetscSection s, PetscInt *size)
1403: {
1404: PetscInt64 n = 0;
1406: PetscFunctionBegin;
1408: PetscAssertPointer(size, 2);
1409: for (PetscInt p = 0; p < s->pEnd - s->pStart; ++p) n += s->atlasDof[p] > 0 ? s->atlasDof[p] : 0;
1410: PetscCall(PetscIntCast(n, size));
1411: PetscFunctionReturn(PETSC_SUCCESS);
1412: }
1414: /*@
1415: PetscSectionGetConstrainedStorageSize - Return the size of an array or local `Vec` capable of holding all unconstrained degrees of freedom in a `PetscSection`
1417: Not Collective
1419: Input Parameter:
1420: . s - the `PetscSection`
1422: Output Parameter:
1423: . size - the size of an array which can hold all unconstrained dofs
1425: Level: intermediate
1427: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetStorageSize()`, `PetscSectionGetOffset()`, `PetscSectionCreate()`
1428: @*/
1429: PetscErrorCode PetscSectionGetConstrainedStorageSize(PetscSection s, PetscInt *size)
1430: {
1431: PetscInt64 n = 0;
1433: PetscFunctionBegin;
1435: PetscAssertPointer(size, 2);
1436: for (PetscInt p = 0; p < s->pEnd - s->pStart; ++p) {
1437: const PetscInt cdof = s->bc ? s->bc->atlasDof[p] : 0;
1438: n += s->atlasDof[p] > 0 ? s->atlasDof[p] - cdof : 0;
1439: }
1440: PetscCall(PetscIntCast(n, size));
1441: PetscFunctionReturn(PETSC_SUCCESS);
1442: }
1444: /*@
1445: PetscSectionCreateGlobalSection - Create a parallel section describing the global layout using
1446: a local (sequential) `PetscSection` on each MPI process and a `PetscSF` describing the section point overlap.
1448: Input Parameters:
1449: + s - The `PetscSection` for the local field layout
1450: . sf - The `PetscSF` describing parallel layout of the section points (leaves are unowned local points)
1451: . usePermutation - By default this is `PETSC_TRUE`, meaning any permutation of the local section is transferred to the global section
1452: . includeConstraints - By default this is `PETSC_FALSE`, meaning that the global field vector will not possess constrained dofs
1453: - localOffsets - If `PETSC_TRUE`, use local rather than global offsets for the points
1455: Output Parameter:
1456: . gsection - The `PetscSection` for the global field layout
1458: Level: intermediate
1460: Notes:
1461: On each MPI process `gsection` inherits the chart of the `s` on that process.
1463: This sets negative sizes and offsets to points not owned by this process as defined by `sf` but that are within the local value of the chart of `gsection`.
1464: In those locations the value of size is -(size+1) and the value of the offset on the remote process is -(off+1).
1466: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionCreateGlobalSectionCensored()`
1467: @*/
1468: PetscErrorCode PetscSectionCreateGlobalSection(PetscSection s, PetscSF sf, PetscBool usePermutation, PetscBool includeConstraints, PetscBool localOffsets, PetscSection *gsection)
1469: {
1470: PetscSection gs;
1471: const PetscInt *pind = NULL;
1472: PetscInt *recv = NULL, *neg = NULL;
1473: PetscInt pStart, pEnd, p, dof, cdof, off, globalOff = 0, nroots, nlocal, maxleaf;
1474: PetscInt numFields, f, numComponents;
1475: PetscInt foff;
1477: PetscFunctionBegin;
1483: PetscAssertPointer(gsection, 6);
1484: PetscCheck(s->pointMajor, PETSC_COMM_SELF, PETSC_ERR_SUP, "No support for field major ordering");
1485: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), &gs));
1486: PetscCall(PetscSectionGetNumFields(s, &numFields));
1487: if (numFields > 0) PetscCall(PetscSectionSetNumFields(gs, numFields));
1488: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
1489: PetscCall(PetscSectionSetChart(gs, pStart, pEnd));
1490: gs->includesConstraints = includeConstraints;
1491: PetscCall(PetscSFGetGraph(sf, &nroots, NULL, NULL, NULL));
1492: nlocal = nroots; /* The local/leaf space matches global/root space */
1493: /* Must allocate for all points visible to SF, which may be more than this section */
1494: if (nroots >= 0) { /* nroots < 0 means that the graph has not been set, only happens in serial */
1495: PetscCall(PetscSFGetLeafRange(sf, NULL, &maxleaf));
1496: PetscCheck(nroots >= pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "SF roots %" PetscInt_FMT " < pEnd %" PetscInt_FMT, nroots, pEnd);
1497: PetscCheck(maxleaf < nroots, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "Max local leaf %" PetscInt_FMT " >= nroots %" PetscInt_FMT, maxleaf, nroots);
1498: PetscCall(PetscMalloc2(nroots, &neg, nlocal, &recv));
1499: PetscCall(PetscArrayzero(neg, nroots));
1500: }
1501: /* Mark all local points with negative dof */
1502: for (p = pStart; p < pEnd; ++p) {
1503: PetscCall(PetscSectionGetDof(s, p, &dof));
1504: PetscCall(PetscSectionSetDof(gs, p, dof));
1505: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
1506: if (!includeConstraints && cdof > 0) PetscCall(PetscSectionSetConstraintDof(gs, p, cdof));
1507: if (neg) neg[p] = -(dof + 1);
1508: }
1509: PetscCall(PetscSectionSetUpBC(gs));
1510: if (gs->bcIndices) PetscCall(PetscArraycpy(gs->bcIndices, s->bcIndices, gs->bc->atlasOff[gs->bc->pEnd - gs->bc->pStart - 1] + gs->bc->atlasDof[gs->bc->pEnd - gs->bc->pStart - 1]));
1511: if (nroots >= 0) {
1512: PetscCall(PetscArrayzero(recv, nlocal));
1513: PetscCall(PetscSFBcastBegin(sf, MPIU_INT, neg, recv, MPI_REPLACE));
1514: PetscCall(PetscSFBcastEnd(sf, MPIU_INT, neg, recv, MPI_REPLACE));
1515: for (p = pStart; p < pEnd; ++p) {
1516: if (recv[p] < 0) {
1517: gs->atlasDof[p - pStart] = recv[p];
1518: PetscCall(PetscSectionGetDof(s, p, &dof));
1519: PetscCheck(-(recv[p] + 1) == dof, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Global dof %" PetscInt_FMT " for point %" PetscInt_FMT " is not the unconstrained %" PetscInt_FMT, -(recv[p] + 1), p, dof);
1520: }
1521: }
1522: }
1523: /* Calculate new sizes, get process offset, and calculate point offsets */
1524: if (usePermutation && s->perm) PetscCall(ISGetIndices(s->perm, &pind));
1525: for (p = 0, off = 0; p < pEnd - pStart; ++p) {
1526: const PetscInt q = pind ? pind[p] : p;
1528: cdof = (!includeConstraints && s->bc) ? s->bc->atlasDof[q] : 0;
1529: gs->atlasOff[q] = off;
1530: off += gs->atlasDof[q] > 0 ? gs->atlasDof[q] - cdof : 0;
1531: }
1532: if (!localOffsets) {
1533: PetscCallMPI(MPI_Scan(&off, &globalOff, 1, MPIU_INT, MPI_SUM, PetscObjectComm((PetscObject)sf)));
1534: globalOff -= off;
1535: }
1536: for (p = pStart, off = 0; p < pEnd; ++p) {
1537: gs->atlasOff[p - pStart] += globalOff;
1538: if (neg) neg[p] = -(gs->atlasOff[p - pStart] + 1);
1539: }
1540: if (usePermutation && s->perm) PetscCall(ISRestoreIndices(s->perm, &pind));
1541: /* Put in negative offsets for ghost points */
1542: if (nroots >= 0) {
1543: PetscCall(PetscArrayzero(recv, nlocal));
1544: PetscCall(PetscSFBcastBegin(sf, MPIU_INT, neg, recv, MPI_REPLACE));
1545: PetscCall(PetscSFBcastEnd(sf, MPIU_INT, neg, recv, MPI_REPLACE));
1546: for (p = pStart; p < pEnd; ++p) {
1547: if (recv[p] < 0) gs->atlasOff[p - pStart] = recv[p];
1548: }
1549: }
1550: PetscCall(PetscFree2(neg, recv));
1551: /* Set field dofs/offsets/constraints */
1552: for (f = 0; f < numFields; ++f) {
1553: const char *name;
1555: gs->field[f]->includesConstraints = includeConstraints;
1556: PetscCall(PetscSectionGetFieldComponents(s, f, &numComponents));
1557: PetscCall(PetscSectionSetFieldComponents(gs, f, numComponents));
1558: PetscCall(PetscSectionGetFieldName(s, f, &name));
1559: PetscCall(PetscSectionSetFieldName(gs, f, name));
1560: }
1561: for (p = pStart; p < pEnd; ++p) {
1562: PetscCall(PetscSectionGetOffset(gs, p, &off));
1563: for (f = 0, foff = off; f < numFields; ++f) {
1564: PetscCall(PetscSectionGetFieldConstraintDof(s, p, f, &cdof));
1565: if (!includeConstraints && cdof > 0) PetscCall(PetscSectionSetFieldConstraintDof(gs, p, f, cdof));
1566: PetscCall(PetscSectionGetFieldDof(s, p, f, &dof));
1567: PetscCall(PetscSectionSetFieldDof(gs, p, f, off < 0 ? -(dof + 1) : dof));
1568: PetscCall(PetscSectionSetFieldOffset(gs, p, f, foff));
1569: PetscCall(PetscSectionGetFieldConstraintDof(gs, p, f, &cdof));
1570: foff = off < 0 ? foff - (dof - cdof) : foff + (dof - cdof);
1571: }
1572: }
1573: for (f = 0; f < numFields; ++f) {
1574: PetscSection gfs = gs->field[f];
1576: PetscCall(PetscSectionSetUpBC(gfs));
1577: if (gfs->bcIndices) PetscCall(PetscArraycpy(gfs->bcIndices, s->field[f]->bcIndices, gfs->bc->atlasOff[gfs->bc->pEnd - gfs->bc->pStart - 1] + gfs->bc->atlasDof[gfs->bc->pEnd - gfs->bc->pStart - 1]));
1578: }
1579: gs->setup = PETSC_TRUE;
1580: PetscCall(PetscSectionViewFromOptions(gs, NULL, "-global_section_view"));
1581: *gsection = gs;
1582: PetscFunctionReturn(PETSC_SUCCESS);
1583: }
1585: /*@
1586: PetscSectionCreateGlobalSectionCensored - Create a `PetscSection` describing the globallayout using
1587: a local (sequential) `PetscSection` on each MPI process and an `PetscSF` describing the section point overlap.
1589: Input Parameters:
1590: + s - The `PetscSection` for the local field layout
1591: . sf - The `PetscSF` describing parallel layout of the section points
1592: . includeConstraints - By default this is `PETSC_FALSE`, meaning that the global vector will not possess constrained dofs
1593: . numExcludes - The number of exclusion ranges, this must have the same value on all MPI processes
1594: - excludes - An array [start_0, end_0, start_1, end_1, ...] where there are `numExcludes` pairs and must have the same values on all MPI processes
1596: Output Parameter:
1597: . gsection - The `PetscSection` for the global field layout
1599: Level: advanced
1601: Notes:
1602: On each MPI process `gsection` inherits the chart of the `s` on that process.
1604: This sets negative sizes and offsets to points not owned by this process as defined by `sf` but that are within the local value of the chart of `gsection`.
1605: In those locations the value of size is -(size+1) and the value of the offset on the remote process is -(off+1).
1607: This routine augments `PetscSectionCreateGlobalSection()` by allowing one to exclude certain ranges in the chart of the `PetscSection`
1609: Developer Notes:
1610: This is a terrible function name
1612: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`
1613: @*/
1614: PetscErrorCode PetscSectionCreateGlobalSectionCensored(PetscSection s, PetscSF sf, PetscBool includeConstraints, PetscInt numExcludes, const PetscInt excludes[], PetscSection *gsection)
1615: {
1616: const PetscInt *pind = NULL;
1617: PetscInt *neg = NULL, *tmpOff = NULL;
1618: PetscInt pStart, pEnd, p, e, dof, cdof, globalOff = 0, nroots;
1619: PetscInt off;
1621: PetscFunctionBegin;
1624: PetscAssertPointer(gsection, 6);
1625: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), gsection));
1626: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
1627: PetscCall(PetscSectionSetChart(*gsection, pStart, pEnd));
1628: PetscCall(PetscSFGetGraph(sf, &nroots, NULL, NULL, NULL));
1629: if (nroots >= 0) {
1630: PetscCheck(nroots >= pEnd - pStart, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "PetscSF nroots %" PetscInt_FMT " < %" PetscInt_FMT " section size", nroots, pEnd - pStart);
1631: PetscCall(PetscCalloc1(nroots, &neg));
1632: if (nroots > pEnd - pStart) {
1633: PetscCall(PetscCalloc1(nroots, &tmpOff));
1634: } else {
1635: tmpOff = &(*gsection)->atlasDof[-pStart];
1636: }
1637: }
1638: /* Mark ghost points with negative dof */
1639: for (p = pStart; p < pEnd; ++p) {
1640: for (e = 0; e < numExcludes; ++e) {
1641: if ((p >= excludes[e * 2 + 0]) && (p < excludes[e * 2 + 1])) {
1642: PetscCall(PetscSectionSetDof(*gsection, p, 0));
1643: break;
1644: }
1645: }
1646: if (e < numExcludes) continue;
1647: PetscCall(PetscSectionGetDof(s, p, &dof));
1648: PetscCall(PetscSectionSetDof(*gsection, p, dof));
1649: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
1650: if (!includeConstraints && cdof > 0) PetscCall(PetscSectionSetConstraintDof(*gsection, p, cdof));
1651: if (neg) neg[p] = -(dof + 1);
1652: }
1653: PetscCall(PetscSectionSetUpBC(*gsection));
1654: if (nroots >= 0) {
1655: PetscCall(PetscSFBcastBegin(sf, MPIU_INT, neg, tmpOff, MPI_REPLACE));
1656: PetscCall(PetscSFBcastEnd(sf, MPIU_INT, neg, tmpOff, MPI_REPLACE));
1657: if (nroots > pEnd - pStart) {
1658: for (p = pStart; p < pEnd; ++p) {
1659: if (tmpOff[p] < 0) (*gsection)->atlasDof[p - pStart] = tmpOff[p];
1660: }
1661: }
1662: }
1663: /* Calculate new sizes, get process offset, and calculate point offsets */
1664: if (s->perm) PetscCall(ISGetIndices(s->perm, &pind));
1665: for (p = 0, off = 0; p < pEnd - pStart; ++p) {
1666: const PetscInt q = pind ? pind[p] : p;
1668: cdof = (!includeConstraints && s->bc) ? s->bc->atlasDof[q] : 0;
1669: (*gsection)->atlasOff[q] = off;
1670: off += (*gsection)->atlasDof[q] > 0 ? (*gsection)->atlasDof[q] - cdof : 0;
1671: }
1672: PetscCallMPI(MPI_Scan(&off, &globalOff, 1, MPIU_INT, MPI_SUM, PetscObjectComm((PetscObject)s)));
1673: globalOff -= off;
1674: for (p = 0, off = 0; p < pEnd - pStart; ++p) {
1675: (*gsection)->atlasOff[p] += globalOff;
1676: if (neg) neg[p + pStart] = -((*gsection)->atlasOff[p] + 1);
1677: }
1678: if (s->perm) PetscCall(ISRestoreIndices(s->perm, &pind));
1679: /* Put in negative offsets for ghost points */
1680: if (nroots >= 0) {
1681: if (nroots == pEnd - pStart) tmpOff = &(*gsection)->atlasOff[-pStart];
1682: PetscCall(PetscSFBcastBegin(sf, MPIU_INT, neg, tmpOff, MPI_REPLACE));
1683: PetscCall(PetscSFBcastEnd(sf, MPIU_INT, neg, tmpOff, MPI_REPLACE));
1684: if (nroots > pEnd - pStart) {
1685: for (p = pStart; p < pEnd; ++p) {
1686: if (tmpOff[p] < 0) (*gsection)->atlasOff[p - pStart] = tmpOff[p];
1687: }
1688: }
1689: }
1690: if (nroots >= 0 && nroots > pEnd - pStart) PetscCall(PetscFree(tmpOff));
1691: PetscCall(PetscFree(neg));
1692: PetscFunctionReturn(PETSC_SUCCESS);
1693: }
1695: /*@
1696: PetscSectionGetPointLayout - Get a `PetscLayout` for the points with nonzero dof counts of the unnamed default field within this `PetscSection`s local chart
1698: Collective
1700: Input Parameters:
1701: + comm - The `MPI_Comm`
1702: - s - The `PetscSection`
1704: Output Parameter:
1705: . layout - The point layout for the data that defines the section
1707: Level: advanced
1709: Notes:
1710: `PetscSectionGetValueLayout()` provides similar information but counting the total number of degrees of freedom on the MPI process (excluding constrained
1711: degrees of freedom).
1713: This count includes constrained degrees of freedom
1715: This is usually called on the default global section.
1717: Example:
1718: .vb
1719: The chart is [2,5), point 2 has 2 dof, point 3 has 0 dof, point 4 has 1 dof
1720: The local size of the `PetscLayout` is 2 since 2 points have a non-zero number of dof
1721: .ve
1723: Developer Notes:
1724: I find the names of these two functions extremely non-informative
1726: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetValueLayout()`, `PetscSectionCreate()`
1727: @*/
1728: PetscErrorCode PetscSectionGetPointLayout(MPI_Comm comm, PetscSection s, PetscLayout *layout)
1729: {
1730: PetscInt pStart, pEnd, p, localSize = 0;
1732: PetscFunctionBegin;
1733: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
1734: for (p = pStart; p < pEnd; ++p) {
1735: PetscInt dof;
1737: PetscCall(PetscSectionGetDof(s, p, &dof));
1738: if (dof >= 0) ++localSize;
1739: }
1740: PetscCall(PetscLayoutCreate(comm, layout));
1741: PetscCall(PetscLayoutSetLocalSize(*layout, localSize));
1742: PetscCall(PetscLayoutSetBlockSize(*layout, 1));
1743: PetscCall(PetscLayoutSetUp(*layout));
1744: PetscFunctionReturn(PETSC_SUCCESS);
1745: }
1747: /*@
1748: PetscSectionGetValueLayout - Get the `PetscLayout` associated with the section dofs of a `PetscSection`
1750: Collective
1752: Input Parameters:
1753: + comm - The `MPI_Comm`
1754: - s - The `PetscSection`
1756: Output Parameter:
1757: . layout - The dof layout for the section
1759: Level: advanced
1761: Notes:
1762: `PetscSectionGetPointLayout()` provides similar information but only counting the number of points with nonzero degrees of freedom and
1763: including the constrained degrees of freedom
1765: This is usually called for the default global section.
1767: Example:
1768: .vb
1769: The chart is [2,5), point 2 has 4 dof (2 constrained), point 3 has 0 dof, point 4 has 1 dof (not constrained)
1770: The local size of the `PetscLayout` is 3 since there are 3 unconstrained degrees of freedom on this MPI process
1771: .ve
1773: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetPointLayout()`, `PetscSectionCreate()`
1774: @*/
1775: PetscErrorCode PetscSectionGetValueLayout(MPI_Comm comm, PetscSection s, PetscLayout *layout)
1776: {
1777: PetscInt pStart, pEnd, p, localSize = 0;
1779: PetscFunctionBegin;
1781: PetscAssertPointer(layout, 3);
1782: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
1783: for (p = pStart; p < pEnd; ++p) {
1784: PetscInt dof, cdof;
1786: PetscCall(PetscSectionGetDof(s, p, &dof));
1787: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
1788: if (dof - cdof > 0) localSize += dof - cdof;
1789: }
1790: PetscCall(PetscLayoutCreate(comm, layout));
1791: PetscCall(PetscLayoutSetLocalSize(*layout, localSize));
1792: PetscCall(PetscLayoutSetBlockSize(*layout, 1));
1793: PetscCall(PetscLayoutSetUp(*layout));
1794: PetscFunctionReturn(PETSC_SUCCESS);
1795: }
1797: /*@
1798: PetscSectionGetOffset - Return the offset into an array or `Vec` for the dof associated with the given point.
1800: Not Collective
1802: Input Parameters:
1803: + s - the `PetscSection`
1804: - point - the point
1806: Output Parameter:
1807: . offset - the offset
1809: Level: intermediate
1811: Notes:
1812: In a global section, `offset` will be negative for points not owned by this process.
1814: This is for the unnamed default field in the `PetscSection` not the named fields
1816: The `offset` values are different depending on a value set with `PetscSectionSetPointMajor()`
1818: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldOffset()`, `PetscSectionCreate()`, `PetscSectionSetPointMajor()`
1819: @*/
1820: PetscErrorCode PetscSectionGetOffset(PetscSection s, PetscInt point, PetscInt *offset)
1821: {
1822: PetscFunctionBegin;
1824: PetscAssertPointer(offset, 3);
1825: PetscAssert(!(point < s->pStart) && !(point >= s->pEnd), PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Section point %" PetscInt_FMT " should be in [%" PetscInt_FMT ", %" PetscInt_FMT ")", point, s->pStart, s->pEnd);
1826: *offset = s->atlasOff[point - s->pStart];
1827: PetscFunctionReturn(PETSC_SUCCESS);
1828: }
1830: /*@
1831: PetscSectionSetOffset - Set the offset into an array or `Vec` for the dof associated with the given point.
1833: Not Collective
1835: Input Parameters:
1836: + s - the `PetscSection`
1837: . point - the point
1838: - offset - the offset, these values may be negative indicating the values are off process
1840: Level: developer
1842: Note:
1843: The user usually does not call this function, but uses `PetscSectionSetUp()`
1845: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldOffset()`, `PetscSectionCreate()`, `PetscSectionSetUp()`
1846: @*/
1847: PetscErrorCode PetscSectionSetOffset(PetscSection s, PetscInt point, PetscInt offset)
1848: {
1849: PetscFunctionBegin;
1851: PetscCheck(!(point < s->pStart) && !(point >= s->pEnd), PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Section point %" PetscInt_FMT " should be in [%" PetscInt_FMT ", %" PetscInt_FMT ")", point, s->pStart, s->pEnd);
1852: s->atlasOff[point - s->pStart] = offset;
1853: PetscFunctionReturn(PETSC_SUCCESS);
1854: }
1856: /*@
1857: PetscSectionGetFieldOffset - Return the offset into an array or `Vec` for the field dof associated with the given point.
1859: Not Collective
1861: Input Parameters:
1862: + s - the `PetscSection`
1863: . point - the point
1864: - field - the field
1866: Output Parameter:
1867: . offset - the offset
1869: Level: intermediate
1871: Notes:
1872: In a global section, `offset` will be negative for points not owned by this process.
1874: The `offset` values are different depending on a value set with `PetscSectionSetPointMajor()`
1876: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetOffset()`, `PetscSectionCreate()`, `PetscSectionGetFieldPointOffset()`
1877: @*/
1878: PetscErrorCode PetscSectionGetFieldOffset(PetscSection s, PetscInt point, PetscInt field, PetscInt *offset)
1879: {
1880: PetscFunctionBegin;
1882: PetscAssertPointer(offset, 4);
1883: PetscSectionCheckValidField(field, s->numFields);
1884: PetscCall(PetscSectionGetOffset(s->field[field], point, offset));
1885: PetscFunctionReturn(PETSC_SUCCESS);
1886: }
1888: /*@
1889: PetscSectionSetFieldOffset - Set the offset into an array or `Vec` for the dof associated with the given field at a point.
1891: Not Collective
1893: Input Parameters:
1894: + s - the `PetscSection`
1895: . point - the point
1896: . field - the field
1897: - offset - the offset, these values may be negative indicating the values are off process
1899: Level: developer
1901: Note:
1902: The user usually does not call this function, but uses `PetscSectionSetUp()`
1904: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetFieldOffset()`, `PetscSectionSetOffset()`, `PetscSectionCreate()`, `PetscSectionSetUp()`
1905: @*/
1906: PetscErrorCode PetscSectionSetFieldOffset(PetscSection s, PetscInt point, PetscInt field, PetscInt offset)
1907: {
1908: PetscFunctionBegin;
1910: PetscSectionCheckValidField(field, s->numFields);
1911: PetscCall(PetscSectionSetOffset(s->field[field], point, offset));
1912: PetscFunctionReturn(PETSC_SUCCESS);
1913: }
1915: /*@
1916: PetscSectionGetFieldPointOffset - Return the offset for the first field dof associated with the given point relative to the offset for that point for the
1917: unnamed default field's first dof
1919: Not Collective
1921: Input Parameters:
1922: + s - the `PetscSection`
1923: . point - the point
1924: - field - the field
1926: Output Parameter:
1927: . offset - the offset
1929: Level: advanced
1931: Note:
1932: This ignores constraints
1934: Example:
1935: .vb
1936: if PetscSectionSetPointMajor(s,PETSC_TRUE)
1937: The unnamed default field has 3 dof at `point`
1938: Field 0 has 2 dof at `point`
1939: Then PetscSectionGetFieldPointOffset(s,point,1,&offset) returns and offset of 5
1940: .ve
1942: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetOffset()`, `PetscSectionCreate()`, `PetscSectionGetFieldOffset()`
1943: @*/
1944: PetscErrorCode PetscSectionGetFieldPointOffset(PetscSection s, PetscInt point, PetscInt field, PetscInt *offset)
1945: {
1946: PetscInt off, foff;
1948: PetscFunctionBegin;
1950: PetscAssertPointer(offset, 4);
1951: PetscSectionCheckValidField(field, s->numFields);
1952: PetscCall(PetscSectionGetOffset(s, point, &off));
1953: PetscCall(PetscSectionGetOffset(s->field[field], point, &foff));
1954: *offset = foff - off;
1955: PetscFunctionReturn(PETSC_SUCCESS);
1956: }
1958: /*@
1959: PetscSectionGetOffsetRange - Return the full range of offsets [`start`, `end`) for a `PetscSection`
1961: Not Collective
1963: Input Parameter:
1964: . s - the `PetscSection`
1966: Output Parameters:
1967: + start - the minimum offset
1968: - end - one more than the maximum offset
1970: Level: intermediate
1972: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetOffset()`, `PetscSectionCreate()`
1973: @*/
1974: PetscErrorCode PetscSectionGetOffsetRange(PetscSection s, PetscInt *start, PetscInt *end)
1975: {
1976: PetscInt os = 0, oe = 0, pStart, pEnd, p;
1978: PetscFunctionBegin;
1980: if (s->atlasOff) {
1981: os = s->atlasOff[0];
1982: oe = s->atlasOff[0];
1983: }
1984: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
1985: for (p = 0; p < pEnd - pStart; ++p) {
1986: PetscInt dof = s->atlasDof[p], off = s->atlasOff[p];
1988: if (off >= 0) {
1989: os = PetscMin(os, off);
1990: oe = PetscMax(oe, off + dof);
1991: }
1992: }
1993: if (start) *start = os;
1994: if (end) *end = oe;
1995: PetscFunctionReturn(PETSC_SUCCESS);
1996: }
1998: /*@
1999: PetscSectionCreateSubsection - Create a new, smaller `PetscSection` composed of only selected fields
2001: Collective
2003: Input Parameters:
2004: + s - the `PetscSection`
2005: . len - the number of subfields
2006: - fields - the subfield numbers
2008: Output Parameter:
2009: . subs - the subsection
2011: Level: advanced
2013: Notes:
2014: The chart of `subs` is the same as the chart of `s`
2016: This will error if a fieldnumber is out of range
2018: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreateSupersection()`, `PetscSectionCreate()`
2019: @*/
2020: PetscErrorCode PetscSectionCreateSubsection(PetscSection s, PetscInt len, const PetscInt fields[], PetscSection *subs)
2021: {
2022: PetscInt nF, f, c, pStart, pEnd, p, maxCdof = 0;
2024: PetscFunctionBegin;
2025: if (!len) PetscFunctionReturn(PETSC_SUCCESS);
2027: PetscAssertPointer(fields, 3);
2028: PetscAssertPointer(subs, 4);
2029: PetscCall(PetscSectionGetNumFields(s, &nF));
2030: PetscCheck(len <= nF, PetscObjectComm((PetscObject)s), PETSC_ERR_ARG_WRONG, "Number of requested fields %" PetscInt_FMT " greater than number of fields %" PetscInt_FMT, len, nF);
2031: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), subs));
2032: PetscCall(PetscSectionSetNumFields(*subs, len));
2033: for (f = 0; f < len; ++f) {
2034: const char *name = NULL;
2035: PetscInt numComp = 0;
2036: PetscSectionSym sym;
2038: PetscCall(PetscSectionGetFieldName(s, fields[f], &name));
2039: PetscCall(PetscSectionSetFieldName(*subs, f, name));
2040: PetscCall(PetscSectionGetFieldComponents(s, fields[f], &numComp));
2041: PetscCall(PetscSectionSetFieldComponents(*subs, f, numComp));
2042: for (c = 0; c < s->numFieldComponents[fields[f]]; ++c) {
2043: PetscCall(PetscSectionGetComponentName(s, fields[f], c, &name));
2044: PetscCall(PetscSectionSetComponentName(*subs, f, c, name));
2045: }
2046: PetscCall(PetscSectionGetFieldSym(s, fields[f], &sym));
2047: PetscCall(PetscSectionSetFieldSym(*subs, f, sym));
2048: }
2049: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
2050: PetscCall(PetscSectionSetChart(*subs, pStart, pEnd));
2051: for (p = pStart; p < pEnd; ++p) {
2052: PetscInt dof = 0, cdof = 0, fdof = 0, cfdof = 0;
2054: for (f = 0; f < len; ++f) {
2055: PetscCall(PetscSectionGetFieldDof(s, p, fields[f], &fdof));
2056: PetscCall(PetscSectionSetFieldDof(*subs, p, f, fdof));
2057: PetscCall(PetscSectionGetFieldConstraintDof(s, p, fields[f], &cfdof));
2058: if (cfdof) PetscCall(PetscSectionSetFieldConstraintDof(*subs, p, f, cfdof));
2059: dof += fdof;
2060: cdof += cfdof;
2061: }
2062: PetscCall(PetscSectionSetDof(*subs, p, dof));
2063: if (cdof) PetscCall(PetscSectionSetConstraintDof(*subs, p, cdof));
2064: maxCdof = PetscMax(cdof, maxCdof);
2065: }
2066: PetscBT bst, subbst;
2068: PetscCall(PetscSectionGetBlockStarts(s, &bst));
2069: if (bst) {
2070: PetscCall(PetscBTCreate(pEnd - pStart, &subbst));
2071: PetscCall(PetscBTCopy(subbst, pEnd - pStart, bst));
2072: PetscCall(PetscSectionSetBlockStarts(*subs, subbst));
2073: }
2074: PetscCall(PetscSectionSetUp(*subs));
2075: if (maxCdof) {
2076: PetscInt *indices;
2078: PetscCall(PetscMalloc1(maxCdof, &indices));
2079: for (p = pStart; p < pEnd; ++p) {
2080: PetscInt cdof;
2082: PetscCall(PetscSectionGetConstraintDof(*subs, p, &cdof));
2083: if (cdof) {
2084: const PetscInt *oldIndices = NULL;
2085: PetscInt fdof = 0, cfdof = 0, fc, numConst = 0, fOff = 0;
2087: for (f = 0; f < len; ++f) {
2088: PetscCall(PetscSectionGetFieldDof(s, p, fields[f], &fdof));
2089: PetscCall(PetscSectionGetFieldConstraintDof(s, p, fields[f], &cfdof));
2090: PetscCall(PetscSectionGetFieldConstraintIndices(s, p, fields[f], &oldIndices));
2091: PetscCall(PetscSectionSetFieldConstraintIndices(*subs, p, f, oldIndices));
2092: for (fc = 0; fc < cfdof; ++fc) indices[numConst + fc] = oldIndices[fc] + fOff;
2093: numConst += cfdof;
2094: fOff += fdof;
2095: }
2096: PetscCall(PetscSectionSetConstraintIndices(*subs, p, indices));
2097: }
2098: }
2099: PetscCall(PetscFree(indices));
2100: }
2101: PetscFunctionReturn(PETSC_SUCCESS);
2102: }
2104: /*@
2105: PetscSectionCreateComponentSubsection - Create a new, smaller `PetscSection` composed of only selected components
2107: Collective
2109: Input Parameters:
2110: + s - the `PetscSection`
2111: . len - the number of components
2112: - comps - the component numbers
2114: Output Parameter:
2115: . subs - the subsection
2117: Level: advanced
2119: Notes:
2120: The chart of `subs` is the same as the chart of `s`
2122: This will error if the section has more than one field, or if a component number is out of range
2124: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreateSupersection()`, `PetscSectionCreate()`
2125: @*/
2126: PetscErrorCode PetscSectionCreateComponentSubsection(PetscSection s, PetscInt len, const PetscInt comps[], PetscSection *subs)
2127: {
2128: PetscSectionSym sym;
2129: const char *name = NULL;
2130: PetscInt Nf, pStart, pEnd;
2132: PetscFunctionBegin;
2133: if (!len) PetscFunctionReturn(PETSC_SUCCESS);
2135: PetscAssertPointer(comps, 3);
2136: PetscAssertPointer(subs, 4);
2137: PetscCall(PetscSectionGetNumFields(s, &Nf));
2138: PetscCheck(Nf == 1, PetscObjectComm((PetscObject)s), PETSC_ERR_ARG_WRONG, "This method can only handle one field, not %" PetscInt_FMT, Nf);
2139: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), subs));
2140: PetscCall(PetscSectionSetNumFields(*subs, 1));
2141: PetscCall(PetscSectionGetFieldName(s, 0, &name));
2142: PetscCall(PetscSectionSetFieldName(*subs, 0, name));
2143: PetscCall(PetscSectionSetFieldComponents(*subs, 0, len));
2144: PetscCall(PetscSectionGetFieldSym(s, 0, &sym));
2145: PetscCall(PetscSectionSetFieldSym(*subs, 0, sym));
2146: for (PetscInt c = 0; c < len; ++c) {
2147: PetscCall(PetscSectionGetComponentName(s, 0, comps[c], &name));
2148: PetscCall(PetscSectionSetComponentName(*subs, 0, c, name));
2149: }
2150: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
2151: PetscCall(PetscSectionSetChart(*subs, pStart, pEnd));
2152: for (PetscInt p = pStart; p < pEnd; ++p) {
2153: PetscInt dof, cdof, cfdof;
2155: PetscCall(PetscSectionGetDof(s, p, &dof));
2156: if (!dof) continue;
2157: PetscCall(PetscSectionGetFieldConstraintDof(s, p, 0, &cfdof));
2158: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
2159: PetscCheck(!cdof && !cfdof, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Component selection does not work with constraints");
2160: PetscCall(PetscSectionSetFieldDof(*subs, p, 0, len));
2161: PetscCall(PetscSectionSetDof(*subs, p, len));
2162: }
2163: PetscCall(PetscSectionSetUp(*subs));
2164: PetscFunctionReturn(PETSC_SUCCESS);
2165: }
2167: /*@
2168: PetscSectionCreateSupersection - Create a new, larger section composed of multiple `PetscSection`s
2170: Collective
2172: Input Parameters:
2173: + s - the input sections
2174: - len - the number of input sections
2176: Output Parameter:
2177: . supers - the supersection
2179: Level: advanced
2181: Notes:
2182: The section offsets now refer to a new, larger vector.
2184: Developer Notes:
2185: Needs to explain how the sections are composed
2187: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreateSubsection()`, `PetscSectionCreate()`
2188: @*/
2189: PetscErrorCode PetscSectionCreateSupersection(PetscSection s[], PetscInt len, PetscSection *supers)
2190: {
2191: PetscInt Nf = 0, f, pStart = PETSC_INT_MAX, pEnd = 0, p, maxCdof = 0, i;
2193: PetscFunctionBegin;
2194: if (!len) PetscFunctionReturn(PETSC_SUCCESS);
2195: for (i = 0; i < len; ++i) {
2196: PetscInt nf, pStarti, pEndi;
2198: PetscCall(PetscSectionGetNumFields(s[i], &nf));
2199: PetscCall(PetscSectionGetChart(s[i], &pStarti, &pEndi));
2200: pStart = PetscMin(pStart, pStarti);
2201: pEnd = PetscMax(pEnd, pEndi);
2202: Nf += nf;
2203: }
2204: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s[0]), supers));
2205: PetscCall(PetscSectionSetNumFields(*supers, Nf));
2206: for (i = 0, f = 0; i < len; ++i) {
2207: PetscInt nf, fi, ci;
2209: PetscCall(PetscSectionGetNumFields(s[i], &nf));
2210: for (fi = 0; fi < nf; ++fi, ++f) {
2211: const char *name = NULL;
2212: PetscInt numComp = 0;
2214: PetscCall(PetscSectionGetFieldName(s[i], fi, &name));
2215: PetscCall(PetscSectionSetFieldName(*supers, f, name));
2216: PetscCall(PetscSectionGetFieldComponents(s[i], fi, &numComp));
2217: PetscCall(PetscSectionSetFieldComponents(*supers, f, numComp));
2218: for (ci = 0; ci < s[i]->numFieldComponents[fi]; ++ci) {
2219: PetscCall(PetscSectionGetComponentName(s[i], fi, ci, &name));
2220: PetscCall(PetscSectionSetComponentName(*supers, f, ci, name));
2221: }
2222: }
2223: }
2224: PetscCall(PetscSectionSetChart(*supers, pStart, pEnd));
2225: for (p = pStart; p < pEnd; ++p) {
2226: PetscInt dof = 0, cdof = 0;
2228: for (i = 0, f = 0; i < len; ++i) {
2229: PetscInt nf, fi, pStarti, pEndi;
2230: PetscInt fdof = 0, cfdof = 0;
2232: PetscCall(PetscSectionGetNumFields(s[i], &nf));
2233: PetscCall(PetscSectionGetChart(s[i], &pStarti, &pEndi));
2234: if ((p < pStarti) || (p >= pEndi)) continue;
2235: for (fi = 0; fi < nf; ++fi, ++f) {
2236: PetscCall(PetscSectionGetFieldDof(s[i], p, fi, &fdof));
2237: PetscCall(PetscSectionAddFieldDof(*supers, p, f, fdof));
2238: PetscCall(PetscSectionGetFieldConstraintDof(s[i], p, fi, &cfdof));
2239: if (cfdof) PetscCall(PetscSectionAddFieldConstraintDof(*supers, p, f, cfdof));
2240: dof += fdof;
2241: cdof += cfdof;
2242: }
2243: }
2244: PetscCall(PetscSectionSetDof(*supers, p, dof));
2245: if (cdof) PetscCall(PetscSectionSetConstraintDof(*supers, p, cdof));
2246: maxCdof = PetscMax(cdof, maxCdof);
2247: }
2248: PetscCall(PetscSectionSetUp(*supers));
2249: if (maxCdof) {
2250: PetscInt *indices;
2252: PetscCall(PetscMalloc1(maxCdof, &indices));
2253: for (p = pStart; p < pEnd; ++p) {
2254: PetscInt cdof;
2256: PetscCall(PetscSectionGetConstraintDof(*supers, p, &cdof));
2257: if (cdof) {
2258: PetscInt dof, numConst = 0, fOff = 0;
2260: for (i = 0, f = 0; i < len; ++i) {
2261: const PetscInt *oldIndices = NULL;
2262: PetscInt nf, fi, pStarti, pEndi, fdof, cfdof, fc;
2264: PetscCall(PetscSectionGetNumFields(s[i], &nf));
2265: PetscCall(PetscSectionGetChart(s[i], &pStarti, &pEndi));
2266: if ((p < pStarti) || (p >= pEndi)) continue;
2267: for (fi = 0; fi < nf; ++fi, ++f) {
2268: PetscCall(PetscSectionGetFieldDof(s[i], p, fi, &fdof));
2269: PetscCall(PetscSectionGetFieldConstraintDof(s[i], p, fi, &cfdof));
2270: PetscCall(PetscSectionGetFieldConstraintIndices(s[i], p, fi, &oldIndices));
2271: for (fc = 0; fc < cfdof; ++fc) indices[numConst + fc] = oldIndices[fc];
2272: PetscCall(PetscSectionSetFieldConstraintIndices(*supers, p, f, &indices[numConst]));
2273: for (fc = 0; fc < cfdof; ++fc) indices[numConst + fc] += fOff;
2274: numConst += cfdof;
2275: }
2276: PetscCall(PetscSectionGetDof(s[i], p, &dof));
2277: fOff += dof;
2278: }
2279: PetscCall(PetscSectionSetConstraintIndices(*supers, p, indices));
2280: }
2281: }
2282: PetscCall(PetscFree(indices));
2283: }
2284: PetscFunctionReturn(PETSC_SUCCESS);
2285: }
2287: static PetscErrorCode PetscSectionCreateSubplexSection_Private(PetscSection s, IS subpointIS, PetscBool renumberPoints, PetscSection *subs)
2288: {
2289: const PetscInt *points = NULL, *indices = NULL;
2290: PetscInt *spoints = NULL, *order = NULL;
2291: PetscInt numFields, f, c, numSubpoints = 0, pStart, pEnd, p, spStart, spEnd, subp;
2293: PetscFunctionBegin;
2296: PetscAssertPointer(subs, 4);
2297: PetscCall(PetscSectionGetNumFields(s, &numFields));
2298: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), subs));
2299: if (numFields) PetscCall(PetscSectionSetNumFields(*subs, numFields));
2300: for (f = 0; f < numFields; ++f) {
2301: const char *name = NULL;
2302: PetscInt numComp = 0;
2304: PetscCall(PetscSectionGetFieldName(s, f, &name));
2305: PetscCall(PetscSectionSetFieldName(*subs, f, name));
2306: PetscCall(PetscSectionGetFieldComponents(s, f, &numComp));
2307: PetscCall(PetscSectionSetFieldComponents(*subs, f, numComp));
2308: for (c = 0; c < s->numFieldComponents[f]; ++c) {
2309: PetscCall(PetscSectionGetComponentName(s, f, c, &name));
2310: PetscCall(PetscSectionSetComponentName(*subs, f, c, name));
2311: }
2312: }
2313: /* For right now, we do not try to squeeze the subchart */
2314: if (subpointIS) {
2315: PetscCall(ISGetLocalSize(subpointIS, &numSubpoints));
2316: PetscCall(ISGetIndices(subpointIS, &points));
2317: }
2318: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
2319: if (renumberPoints) {
2320: PetscBool sorted;
2322: spStart = 0;
2323: spEnd = numSubpoints;
2324: PetscCall(ISSorted(subpointIS, &sorted));
2325: if (!sorted) {
2326: PetscCall(PetscMalloc2(numSubpoints, &spoints, numSubpoints, &order));
2327: PetscCall(PetscArraycpy(spoints, points, numSubpoints));
2328: for (PetscInt i = 0; i < numSubpoints; ++i) order[i] = i;
2329: PetscCall(PetscSortIntWithArray(numSubpoints, spoints, order));
2330: }
2331: } else {
2332: PetscCall(ISGetMinMax(subpointIS, &spStart, &spEnd));
2333: ++spEnd;
2334: }
2335: PetscCall(PetscSectionSetChart(*subs, spStart, spEnd));
2336: for (p = pStart; p < pEnd; ++p) {
2337: PetscInt dof, cdof, fdof = 0, cfdof = 0;
2339: PetscCall(PetscFindInt(p, numSubpoints, spoints ? spoints : points, &subp));
2340: if (subp < 0) continue;
2341: if (!renumberPoints) subp = p;
2342: else subp = order ? order[subp] : subp;
2343: for (f = 0; f < numFields; ++f) {
2344: PetscCall(PetscSectionGetFieldDof(s, p, f, &fdof));
2345: PetscCall(PetscSectionSetFieldDof(*subs, subp, f, fdof));
2346: PetscCall(PetscSectionGetFieldConstraintDof(s, p, f, &cfdof));
2347: if (cfdof) PetscCall(PetscSectionSetFieldConstraintDof(*subs, subp, f, cfdof));
2348: }
2349: PetscCall(PetscSectionGetDof(s, p, &dof));
2350: PetscCall(PetscSectionSetDof(*subs, subp, dof));
2351: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
2352: if (cdof) PetscCall(PetscSectionSetConstraintDof(*subs, subp, cdof));
2353: }
2354: PetscCall(PetscSectionSetUp(*subs));
2355: /* Change offsets to original offsets */
2356: for (p = pStart; p < pEnd; ++p) {
2357: PetscInt off, foff = 0;
2359: PetscCall(PetscFindInt(p, numSubpoints, spoints ? spoints : points, &subp));
2360: if (subp < 0) continue;
2361: if (!renumberPoints) subp = p;
2362: else subp = order ? order[subp] : subp;
2363: for (f = 0; f < numFields; ++f) {
2364: PetscCall(PetscSectionGetFieldOffset(s, p, f, &foff));
2365: PetscCall(PetscSectionSetFieldOffset(*subs, subp, f, foff));
2366: }
2367: PetscCall(PetscSectionGetOffset(s, p, &off));
2368: PetscCall(PetscSectionSetOffset(*subs, subp, off));
2369: }
2370: /* Copy constraint indices */
2371: for (subp = spStart; subp < spEnd; ++subp) {
2372: PetscInt cdof;
2374: PetscCall(PetscSectionGetConstraintDof(*subs, subp, &cdof));
2375: if (cdof) {
2376: for (f = 0; f < numFields; ++f) {
2377: PetscCall(PetscSectionGetFieldConstraintIndices(s, points[subp - spStart], f, &indices));
2378: PetscCall(PetscSectionSetFieldConstraintIndices(*subs, subp, f, indices));
2379: }
2380: PetscCall(PetscSectionGetConstraintIndices(s, points[subp - spStart], &indices));
2381: PetscCall(PetscSectionSetConstraintIndices(*subs, subp, indices));
2382: }
2383: }
2384: if (subpointIS) PetscCall(ISRestoreIndices(subpointIS, &points));
2385: PetscCall(PetscFree2(spoints, order));
2386: PetscFunctionReturn(PETSC_SUCCESS);
2387: }
2389: /*@
2390: PetscSectionCreateSubmeshSection - Create a new, smaller section with support on the submesh
2392: Collective
2394: Input Parameters:
2395: + s - the `PetscSection`
2396: - subpointIS - a sorted list of points in the original mesh which are in the submesh
2398: Output Parameter:
2399: . subs - the subsection
2401: Level: advanced
2403: Notes:
2404: The points are renumbered from 0, and the section offsets now refer to a new, smaller vector. That is the chart of `subs` is `[0,sizeof(subpointmap))`
2406: Compare this with `PetscSectionCreateSubdomainSection()` that does not map the points numbers to start at zero but leaves them as before
2408: Developer Notes:
2409: The use of the term Submesh is confusing and needs clarification, it is not specific to meshes. It appears to be just a subset of the chart of the original `PetscSection`
2411: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreateSubdomainSection()`, `PetscSectionCreateSubsection()`, `DMPlexGetSubpointMap()`, `PetscSectionCreate()`
2412: @*/
2413: PetscErrorCode PetscSectionCreateSubmeshSection(PetscSection s, IS subpointIS, PetscSection *subs)
2414: {
2415: PetscFunctionBegin;
2416: PetscCall(PetscSectionCreateSubplexSection_Private(s, subpointIS, PETSC_TRUE, subs));
2417: PetscFunctionReturn(PETSC_SUCCESS);
2418: }
2420: /*@
2421: PetscSectionCreateSubdomainSection - Create a new, smaller section with support on a subdomain of the mesh
2423: Collective
2425: Input Parameters:
2426: + s - the `PetscSection`
2427: - subpointMap - a sorted list of points in the original mesh which are in the subdomain
2429: Output Parameter:
2430: . subs - the subsection
2432: Level: advanced
2434: Notes:
2435: The point numbers remain the same as in the larger `PetscSection`, but the section offsets now refer to a new, smaller vector. The chart of `subs`
2436: is `[min(subpointMap),max(subpointMap)+1)`
2438: Compare this with `PetscSectionCreateSubmeshSection()` that maps the point numbers to start at zero
2440: Developer Notes:
2441: The use of the term Subdomain is unneeded and needs clarification, it is not specific to meshes. It appears to be just a subset of the chart of the original `PetscSection`
2443: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreateSubmeshSection()`, `PetscSectionCreateSubsection()`, `DMPlexGetSubpointMap()`, `PetscSectionCreate()`
2444: @*/
2445: PetscErrorCode PetscSectionCreateSubdomainSection(PetscSection s, IS subpointMap, PetscSection *subs)
2446: {
2447: PetscFunctionBegin;
2448: PetscCall(PetscSectionCreateSubplexSection_Private(s, subpointMap, PETSC_FALSE, subs));
2449: PetscFunctionReturn(PETSC_SUCCESS);
2450: }
2452: static PetscErrorCode PetscSectionView_ASCII(PetscSection s, PetscViewer viewer)
2453: {
2454: PetscInt p;
2455: PetscMPIInt rank;
2457: PetscFunctionBegin;
2458: PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)viewer), &rank));
2459: PetscCall(PetscViewerASCIIPushSynchronized(viewer));
2460: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, "Process %d:\n", rank));
2461: for (p = 0; p < s->pEnd - s->pStart; ++p) {
2462: if (s->bc && s->bc->atlasDof[p] > 0) {
2463: PetscInt b;
2464: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " (%4" PetscInt_FMT ") dof %2" PetscInt_FMT " offset %3" PetscInt_FMT " constrained", p + s->pStart, s->atlasDof[p], s->atlasOff[p]));
2465: if (s->bcIndices) {
2466: for (b = 0; b < s->bc->atlasDof[p]; ++b) PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %" PetscInt_FMT, s->bcIndices[s->bc->atlasOff[p] + b]));
2467: }
2468: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, "\n"));
2469: } else {
2470: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " (%4" PetscInt_FMT ") dof %2" PetscInt_FMT " offset %3" PetscInt_FMT "\n", p + s->pStart, s->atlasDof[p], s->atlasOff[p]));
2471: }
2472: }
2473: PetscCall(PetscViewerFlush(viewer));
2474: PetscCall(PetscViewerASCIIPopSynchronized(viewer));
2475: if (s->sym) {
2476: PetscCall(PetscViewerASCIIPushTab(viewer));
2477: PetscCall(PetscSectionSymView(s->sym, viewer));
2478: PetscCall(PetscViewerASCIIPopTab(viewer));
2479: }
2480: PetscFunctionReturn(PETSC_SUCCESS);
2481: }
2483: /*@
2484: PetscSectionViewFromOptions - View the `PetscSection` based on values in the options database
2486: Collective
2488: Input Parameters:
2489: + A - the `PetscSection` object to view
2490: . obj - Optional object that provides the options prefix used for the options
2491: - name - command line option
2493: Level: intermediate
2495: Note:
2496: See `PetscObjectViewFromOptions()` for available values of `PetscViewer` and `PetscViewerFormat`
2498: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionView`, `PetscObjectViewFromOptions()`, `PetscSectionCreate()`, `PetscSectionView()`
2499: @*/
2500: PetscErrorCode PetscSectionViewFromOptions(PetscSection A, PetscObject obj, const char name[])
2501: {
2502: PetscFunctionBegin;
2504: PetscCall(PetscObjectViewFromOptions((PetscObject)A, obj, name));
2505: PetscFunctionReturn(PETSC_SUCCESS);
2506: }
2508: /*@
2509: PetscSectionView - Views a `PetscSection`
2511: Collective
2513: Input Parameters:
2514: + s - the `PetscSection` object to view
2515: - viewer - the viewer
2517: Level: beginner
2519: Note:
2520: `PetscSectionView()`, when viewer is of type `PETSCVIEWERHDF5`, only saves
2521: distribution independent data, such as dofs, offsets, constraint dofs,
2522: and constraint indices. Points that have negative dofs, for instance,
2523: are not saved as they represent points owned by other processes.
2524: Point numbering and rank assignment is currently not stored.
2525: The saved section can be loaded with `PetscSectionLoad()`.
2527: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionDestroy()`, `PetscSectionLoad()`, `PetscViewer`
2528: @*/
2529: PetscErrorCode PetscSectionView(PetscSection s, PetscViewer viewer)
2530: {
2531: PetscBool isascii, ishdf5;
2532: PetscInt f;
2534: PetscFunctionBegin;
2536: if (!viewer) PetscCall(PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)s), &viewer));
2538: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
2539: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERHDF5, &ishdf5));
2540: if (isascii) {
2541: PetscCall(PetscObjectPrintClassNamePrefixType((PetscObject)s, viewer));
2542: if (s->numFields) {
2543: PetscCall(PetscViewerASCIIPrintf(viewer, "%" PetscInt_FMT " fields\n", s->numFields));
2544: for (f = 0; f < s->numFields; ++f) {
2545: PetscCall(PetscViewerASCIIPrintf(viewer, " field %" PetscInt_FMT " \"%s\" with %" PetscInt_FMT " components\n", f, s->fieldNames[f], s->numFieldComponents[f]));
2546: PetscCall(PetscSectionView_ASCII(s->field[f], viewer));
2547: }
2548: } else {
2549: PetscCall(PetscSectionView_ASCII(s, viewer));
2550: }
2551: } else if (ishdf5) {
2552: #if PetscDefined(HAVE_HDF5)
2553: PetscCall(PetscSectionView_HDF5_Internal(s, viewer));
2554: #else
2555: SETERRQ(PetscObjectComm((PetscObject)s), PETSC_ERR_SUP, "HDF5 not supported in this build.\nPlease reconfigure using --download-hdf5");
2556: #endif
2557: }
2558: PetscFunctionReturn(PETSC_SUCCESS);
2559: }
2561: /*@
2562: PetscSectionLoad - Loads a `PetscSection`
2564: Collective
2566: Input Parameters:
2567: + s - the `PetscSection` object to load
2568: - viewer - the viewer
2570: Level: beginner
2572: Note:
2573: `PetscSectionLoad()`, when viewer is of type `PETSCVIEWERHDF5`, loads
2574: a section saved with `PetscSectionView()`. The number of processes
2575: used here (N) does not need to be the same as that used when saving.
2576: After calling this function, the chart of s on rank i will be set
2577: to [0, E_i), where \sum_{i=0}^{N-1}E_i equals to the total number of
2578: saved section points.
2580: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionDestroy()`, `PetscSectionView()`
2581: @*/
2582: PetscErrorCode PetscSectionLoad(PetscSection s, PetscViewer viewer)
2583: {
2584: PetscBool ishdf5;
2586: PetscFunctionBegin;
2589: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERHDF5, &ishdf5));
2590: PetscCheck(ishdf5, PetscObjectComm((PetscObject)s), PETSC_ERR_SUP, "Viewer type %s not yet supported for PetscSection loading", ((PetscObject)viewer)->type_name);
2591: #if PetscDefined(HAVE_HDF5)
2592: PetscCall(PetscSectionLoad_HDF5_Internal(s, viewer));
2593: PetscFunctionReturn(PETSC_SUCCESS);
2594: #else
2595: SETERRQ(PetscObjectComm((PetscObject)s), PETSC_ERR_SUP, "HDF5 not supported in this build.\nPlease reconfigure using --download-hdf5");
2596: #endif
2597: }
2599: static inline PetscErrorCode PrintArrayElement(void *array, PetscDataType data_type, PetscCount index, PetscViewer viewer)
2600: {
2601: PetscFunctionBeginUser;
2602: switch (data_type) {
2603: case PETSC_INT: {
2604: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %2" PetscInt_FMT, ((PetscInt *)array)[index]));
2605: break;
2606: }
2607: case PETSC_INT32: {
2608: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %2" PetscInt32_FMT, ((PetscInt32 *)array)[index]));
2609: break;
2610: }
2611: case PETSC_INT64: {
2612: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %2" PetscInt64_FMT, ((PetscInt64 *)array)[index]));
2613: break;
2614: }
2615: case PETSC_COUNT: {
2616: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %2" PetscCount_FMT, ((PetscCount *)array)[index]));
2617: break;
2618: }
2619: // PETSC_SCALAR is set to the appropriate type
2620: case PETSC_DOUBLE: {
2621: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g", ((double *)array)[index]));
2622: break;
2623: }
2624: case PETSC_FLOAT: {
2625: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)((float *)array)[index]));
2626: break;
2627: }
2628: #if defined(PETSC_USE_REAL___FLOAT128)
2629: case PETSC___FLOAT128: {
2630: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)((PetscReal *)array)[index]));
2631: break;
2632: }
2633: #endif
2634: #if defined(PETSC_USE_REAL___FP16)
2635: case PETSC___FP16: {
2636: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)((PetscReal *)array)[index]));
2637: break;
2638: }
2639: #endif
2640: #if defined(PETSC_HAVE_COMPLEX)
2641: case PETSC_COMPLEX: {
2642: PetscComplex v = ((PetscComplex *)array)[index];
2643: if (PetscImaginaryPartComplex(v) > 0.0) {
2644: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g + %g i", (double)PetscRealPartComplex(v), (double)PetscImaginaryPartComplex(v)));
2645: } else if (PetscImaginaryPartComplex(v) < 0.0) {
2646: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g - %g i", (double)PetscRealPartComplex(v), (double)(-PetscImaginaryPartComplex(v))));
2647: } else {
2648: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %g", (double)PetscRealPartComplex(v)));
2649: }
2650: break;
2651: }
2652: #endif
2653: default:
2654: SETERRQ(PetscObjectComm((PetscObject)viewer), PETSC_ERR_SUP, "PetscDataType %d (%s) not supported", data_type, PetscDataTypes[data_type]);
2655: }
2656: PetscFunctionReturn(PETSC_SUCCESS);
2657: }
2659: PetscErrorCode PetscSectionArrayView_ASCII_Internal(PetscSection s, void *array, PetscDataType data_type, PetscViewer viewer)
2660: {
2661: PetscInt p, i;
2662: PetscMPIInt rank;
2664: PetscFunctionBegin;
2665: PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)viewer), &rank));
2666: PetscCall(PetscViewerASCIIPushSynchronized(viewer));
2667: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, "Process %d:\n", rank));
2668: for (p = 0; p < s->pEnd - s->pStart; ++p) {
2669: if (s->bc && (s->bc->atlasDof[p] > 0)) {
2670: PetscInt b;
2672: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " (%4" PetscInt_FMT ") dof %2" PetscInt_FMT " offset %3" PetscInt_FMT, p + s->pStart, s->atlasDof[p], s->atlasOff[p]));
2673: for (i = s->atlasOff[p]; i < s->atlasOff[p] + s->atlasDof[p]; ++i) PetscCall(PrintArrayElement(array, data_type, i, viewer));
2674: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " constrained"));
2675: for (b = 0; b < s->bc->atlasDof[p]; ++b) PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " %" PetscInt_FMT, s->bcIndices[s->bc->atlasOff[p] + b]));
2676: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, "\n"));
2677: } else {
2678: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, " (%4" PetscInt_FMT ") dof %2" PetscInt_FMT " offset %3" PetscInt_FMT, p + s->pStart, s->atlasDof[p], s->atlasOff[p]));
2679: for (i = s->atlasOff[p]; i < s->atlasOff[p] + s->atlasDof[p]; ++i) PetscCall(PrintArrayElement(array, data_type, i, viewer));
2680: PetscCall(PetscViewerASCIISynchronizedPrintf(viewer, "\n"));
2681: }
2682: }
2683: PetscCall(PetscViewerFlush(viewer));
2684: PetscCall(PetscViewerASCIIPopSynchronized(viewer));
2685: PetscFunctionReturn(PETSC_SUCCESS);
2686: }
2688: /*@
2689: PetscSectionArrayView - View an array, using the section to structure the values
2691: Collective
2693: Input Parameters:
2694: + s - the organizing `PetscSection`
2695: . array - the array of values
2696: . data_type - the `PetscDataType` of the array
2697: - viewer - the `PetscViewer`
2699: Level: developer
2701: .seealso: `PetscSection`, `PetscViewer`, `PetscSectionCreate()`, `VecSetValuesSection()`, `PetscSectionVecView()`
2702: @*/
2703: PetscErrorCode PetscSectionArrayView(PetscSection s, void *array, PetscDataType data_type, PetscViewer viewer)
2704: {
2705: PetscBool isascii;
2706: PetscInt f;
2708: PetscFunctionBegin;
2710: PetscAssertPointer(array, 2);
2711: if (!viewer) PetscCall(PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)s), &viewer));
2713: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
2714: if (isascii) {
2715: if (s->numFields) {
2716: PetscCall(PetscViewerASCIIPrintf(viewer, "Array with %" PetscInt_FMT " fields\n", s->numFields));
2717: for (f = 0; f < s->numFields; ++f) {
2718: PetscCall(PetscViewerASCIIPrintf(viewer, " field %" PetscInt_FMT " with %" PetscInt_FMT " components\n", f, s->numFieldComponents[f]));
2719: PetscCall(PetscSectionArrayView_ASCII_Internal(s->field[f], array, data_type, viewer));
2720: }
2721: } else {
2722: PetscCall(PetscSectionArrayView_ASCII_Internal(s, array, data_type, viewer));
2723: }
2724: }
2725: PetscFunctionReturn(PETSC_SUCCESS);
2726: }
2728: /*@
2729: PetscSectionResetClosurePermutation - Remove any existing closure permutation
2731: Input Parameter:
2732: . section - The `PetscSection`
2734: Level: intermediate
2736: .seealso: `PetscSectionSetClosurePermutation()`, `PetscSectionSetClosureIndex()`, `PetscSectionReset()`
2737: @*/
2738: PetscErrorCode PetscSectionResetClosurePermutation(PetscSection section)
2739: {
2740: PetscSectionClosurePermVal clVal;
2742: PetscFunctionBegin;
2743: if (!section->clHash) PetscFunctionReturn(PETSC_SUCCESS);
2744: kh_foreach_value(section->clHash, clVal, {
2745: PetscCall(PetscFree(clVal.perm));
2746: PetscCall(PetscFree(clVal.invPerm));
2747: });
2748: kh_destroy(ClPerm, section->clHash);
2749: section->clHash = NULL;
2750: PetscFunctionReturn(PETSC_SUCCESS);
2751: }
2753: /*@
2754: PetscSectionReset - Frees all section data, the section is then as if `PetscSectionCreate()` had just been called.
2756: Not Collective
2758: Input Parameter:
2759: . s - the `PetscSection`
2761: Level: beginner
2763: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`
2764: @*/
2765: PetscErrorCode PetscSectionReset(PetscSection s)
2766: {
2767: PetscInt f, c;
2769: PetscFunctionBegin;
2771: for (f = 0; f < s->numFields; ++f) {
2772: PetscCall(PetscSectionDestroy(&s->field[f]));
2773: PetscCall(PetscFree(s->fieldNames[f]));
2774: for (c = 0; c < s->numFieldComponents[f]; ++c) PetscCall(PetscFree(s->compNames[f][c]));
2775: PetscCall(PetscFree(s->compNames[f]));
2776: }
2777: PetscCall(PetscFree(s->numFieldComponents));
2778: PetscCall(PetscFree(s->fieldNames));
2779: PetscCall(PetscFree(s->compNames));
2780: PetscCall(PetscFree(s->field));
2781: PetscCall(PetscSectionDestroy(&s->bc));
2782: PetscCall(PetscFree(s->bcIndices));
2783: PetscCall(PetscFree2(s->atlasDof, s->atlasOff));
2784: PetscCall(PetscSectionDestroy(&s->clSection));
2785: PetscCall(ISDestroy(&s->clPoints));
2786: PetscCall(ISDestroy(&s->perm));
2787: PetscCall(PetscBTDestroy(&s->blockStarts));
2788: PetscCall(PetscSectionResetClosurePermutation(s));
2789: PetscCall(PetscSectionSymDestroy(&s->sym));
2790: PetscCall(PetscSectionDestroy(&s->clSection));
2791: PetscCall(ISDestroy(&s->clPoints));
2792: PetscCall(PetscSectionInvalidateMaxDof_Internal(s));
2793: s->pStart = -1;
2794: s->pEnd = -1;
2795: s->maxDof = 0;
2796: s->setup = PETSC_FALSE;
2797: s->numFields = 0;
2798: s->clObj = NULL;
2799: PetscFunctionReturn(PETSC_SUCCESS);
2800: }
2802: /*@
2803: PetscSectionDestroy - Frees a `PetscSection`
2805: Not Collective
2807: Input Parameter:
2808: . s - the `PetscSection`
2810: Level: beginner
2812: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionCreate()`, `PetscSectionReset()`
2813: @*/
2814: PetscErrorCode PetscSectionDestroy(PetscSection *s)
2815: {
2816: PetscFunctionBegin;
2817: if (!*s) PetscFunctionReturn(PETSC_SUCCESS);
2819: if (--((PetscObject)*s)->refct > 0) {
2820: *s = NULL;
2821: PetscFunctionReturn(PETSC_SUCCESS);
2822: }
2823: PetscCall(PetscSectionReset(*s));
2824: PetscCall(PetscHeaderDestroy(s));
2825: PetscFunctionReturn(PETSC_SUCCESS);
2826: }
2828: static PetscErrorCode VecIntGetValuesSection_Private(const PetscInt *baseArray, PetscSection s, PetscInt point, const PetscInt **values)
2829: {
2830: const PetscInt p = point - s->pStart;
2832: PetscFunctionBegin;
2834: *values = &baseArray[s->atlasOff[p]];
2835: PetscFunctionReturn(PETSC_SUCCESS);
2836: }
2838: static PetscErrorCode VecIntSetValuesSection_Private(PetscInt *baseArray, PetscSection s, PetscInt point, const PetscInt values[], InsertMode mode)
2839: {
2840: PetscInt *array;
2841: const PetscInt p = point - s->pStart;
2842: const PetscInt orientation = 0; /* Needs to be included for use in closure operations */
2843: PetscInt cDim = 0;
2845: PetscFunctionBegin;
2847: PetscCall(PetscSectionGetConstraintDof(s, p, &cDim));
2848: array = &baseArray[s->atlasOff[p]];
2849: if (!cDim) {
2850: if (orientation >= 0) {
2851: const PetscInt dim = s->atlasDof[p];
2852: PetscInt i;
2854: if (mode == INSERT_VALUES) {
2855: for (i = 0; i < dim; ++i) array[i] = values ? values[i] : i;
2856: } else {
2857: for (i = 0; i < dim; ++i) array[i] += values[i];
2858: }
2859: } else {
2860: PetscInt offset = 0;
2861: PetscInt j = -1, field, i;
2863: for (field = 0; field < s->numFields; ++field) {
2864: const PetscInt dim = s->field[field]->atlasDof[p];
2866: for (i = dim - 1; i >= 0; --i) array[++j] = values ? values[i + offset] : i + offset;
2867: offset += dim;
2868: }
2869: }
2870: } else {
2871: if (orientation >= 0) {
2872: const PetscInt dim = s->atlasDof[p];
2873: PetscInt cInd = 0, i;
2874: const PetscInt *cDof;
2876: PetscCall(PetscSectionGetConstraintIndices(s, point, &cDof));
2877: if (mode == INSERT_VALUES) {
2878: for (i = 0; i < dim; ++i) {
2879: if ((cInd < cDim) && (i == cDof[cInd])) {
2880: ++cInd;
2881: continue;
2882: }
2883: array[i] = values ? values[i] : i;
2884: }
2885: } else {
2886: for (i = 0; i < dim; ++i) {
2887: if ((cInd < cDim) && (i == cDof[cInd])) {
2888: ++cInd;
2889: continue;
2890: }
2891: array[i] += values[i];
2892: }
2893: }
2894: } else {
2895: const PetscInt *cDof;
2896: PetscInt offset = 0;
2897: PetscInt cOffset = 0;
2898: PetscInt j = 0, field;
2900: PetscCall(PetscSectionGetConstraintIndices(s, point, &cDof));
2901: for (field = 0; field < s->numFields; ++field) {
2902: const PetscInt dim = s->field[field]->atlasDof[p]; /* PetscSectionGetFieldDof() */
2903: const PetscInt tDim = s->field[field]->bc->atlasDof[p]; /* PetscSectionGetFieldConstraintDof() */
2904: const PetscInt sDim = dim - tDim;
2905: PetscInt cInd = 0, i, k;
2907: for (i = 0, k = dim + offset - 1; i < dim; ++i, ++j, --k) {
2908: if ((cInd < sDim) && (j == cDof[cInd + cOffset])) {
2909: ++cInd;
2910: continue;
2911: }
2912: array[j] = values ? values[k] : k;
2913: }
2914: offset += dim;
2915: cOffset += dim - tDim;
2916: }
2917: }
2918: }
2919: PetscFunctionReturn(PETSC_SUCCESS);
2920: }
2922: /*@
2923: PetscSectionHasConstraints - Determine whether a `PetscSection` has constrained dofs
2925: Not Collective
2927: Input Parameter:
2928: . s - The `PetscSection`
2930: Output Parameter:
2931: . hasConstraints - flag indicating that the section has constrained dofs
2933: Level: intermediate
2935: .seealso: [PetscSection](ch_petscsection), `PetscSectionSetConstraintIndices()`, `PetscSectionGetConstraintDof()`, `PetscSection`
2936: @*/
2937: PetscErrorCode PetscSectionHasConstraints(PetscSection s, PetscBool *hasConstraints)
2938: {
2939: PetscFunctionBegin;
2941: PetscAssertPointer(hasConstraints, 2);
2942: *hasConstraints = s->bc ? PETSC_TRUE : PETSC_FALSE;
2943: PetscFunctionReturn(PETSC_SUCCESS);
2944: }
2946: /*@C
2947: PetscSectionGetConstraintIndices - Get the point dof numbers, in [0, dof), which are constrained for a given point
2949: Not Collective
2951: Input Parameters:
2952: + s - The `PetscSection`
2953: - point - The point
2955: Output Parameter:
2956: . indices - The constrained dofs
2958: Level: intermediate
2960: Fortran Notes:
2961: Use `PetscSectionRestoreConstraintIndices()` when the indices are no longer needed
2963: .seealso: [PetscSection](ch_petscsection), `PetscSectionSetConstraintIndices()`, `PetscSectionGetConstraintDof()`, `PetscSection`
2964: @*/
2965: PetscErrorCode PetscSectionGetConstraintIndices(PetscSection s, PetscInt point, const PetscInt *indices[])
2966: {
2967: PetscFunctionBegin;
2969: if (s->bc) PetscCall(VecIntGetValuesSection_Private(s->bcIndices, s->bc, point, indices));
2970: else *indices = NULL;
2971: PetscFunctionReturn(PETSC_SUCCESS);
2972: }
2974: /*@
2975: PetscSectionSetConstraintIndices - Set the point dof numbers, in [0, dof), which are constrained
2977: Not Collective
2979: Input Parameters:
2980: + s - The `PetscSection`
2981: . point - The point
2982: - indices - The constrained dofs
2984: Level: intermediate
2986: .seealso: [PetscSection](ch_petscsection), `PetscSectionGetConstraintIndices()`, `PetscSectionGetConstraintDof()`, `PetscSection`
2987: @*/
2988: PetscErrorCode PetscSectionSetConstraintIndices(PetscSection s, PetscInt point, const PetscInt indices[])
2989: {
2990: PetscFunctionBegin;
2992: if (s->bc) {
2993: const PetscInt dof = s->atlasDof[point];
2994: const PetscInt cdof = s->bc->atlasDof[point];
2995: PetscInt d;
2997: if (indices)
2998: for (d = 0; d < cdof; ++d) PetscCheck(indices[d] < dof, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "Point %" PetscInt_FMT " dof %" PetscInt_FMT ", invalid constraint index[%" PetscInt_FMT "]: %" PetscInt_FMT, point, dof, d, indices[d]);
2999: PetscCall(VecIntSetValuesSection_Private(s->bcIndices, s->bc, point, indices, INSERT_VALUES));
3000: }
3001: PetscFunctionReturn(PETSC_SUCCESS);
3002: }
3004: /*@C
3005: PetscSectionGetFieldConstraintIndices - Get the field dof numbers, in [0, fdof), which are constrained
3007: Not Collective
3009: Input Parameters:
3010: + s - The `PetscSection`
3011: . field - The field number
3012: - point - The point
3014: Output Parameter:
3015: . indices - The constrained dofs sorted in ascending order, the length is returned by `PetscSectionGetConstraintDof()`.
3017: Level: intermediate
3019: Fortran Notes:
3020: Use `PetscSectionRestoreFieldConstraintIndices()` to restore the indices when no longer needed
3022: .seealso: [PetscSection](ch_petscsection), `PetscSectionSetFieldConstraintIndices()`, `PetscSectionGetConstraintIndices()`, `PetscSectionGetConstraintDof()`, `PetscSection`
3023: @*/
3024: PetscErrorCode PetscSectionGetFieldConstraintIndices(PetscSection s, PetscInt point, PetscInt field, const PetscInt *indices[])
3025: {
3026: PetscFunctionBegin;
3028: PetscAssertPointer(indices, 4);
3029: PetscSectionCheckValidField(field, s->numFields);
3030: PetscCall(PetscSectionGetConstraintIndices(s->field[field], point, indices));
3031: PetscFunctionReturn(PETSC_SUCCESS);
3032: }
3034: /*@
3035: PetscSectionSetFieldConstraintIndices - Set the field dof numbers, in [0, fdof), which are constrained
3037: Not Collective
3039: Input Parameters:
3040: + s - The `PetscSection`
3041: . point - The point
3042: . field - The field number
3043: - indices - The constrained dofs
3045: Level: intermediate
3047: .seealso: [PetscSection](ch_petscsection), `PetscSectionSetConstraintIndices()`, `PetscSectionGetFieldConstraintIndices()`, `PetscSectionGetConstraintDof()`, `PetscSection`
3048: @*/
3049: PetscErrorCode PetscSectionSetFieldConstraintIndices(PetscSection s, PetscInt point, PetscInt field, const PetscInt indices[])
3050: {
3051: PetscFunctionBegin;
3053: PetscSectionCheckValidField(field, s->numFields);
3054: PetscCall(PetscSectionSetConstraintIndices(s->field[field], point, indices));
3055: PetscFunctionReturn(PETSC_SUCCESS);
3056: }
3058: /*@
3059: PetscSectionPermute - Reorder the section according to the input point permutation
3061: Collective
3063: Input Parameters:
3064: + section - The `PetscSection` object
3065: - permutation - The point permutation, old point p becomes new point perm[p]
3067: Output Parameter:
3068: . sectionNew - The permuted `PetscSection`
3070: Level: intermediate
3072: Note:
3073: The data and the access to the data via `PetscSectionGetFieldOffset()` and `PetscSectionGetOffset()` are both changed in `sectionNew`
3075: Compare to `PetscSectionSetPermutation()`
3077: .seealso: [PetscSection](ch_petscsection), `IS`, `PetscSection`, `MatPermute()`, `PetscSectionSetPermutation()`
3078: @*/
3079: PetscErrorCode PetscSectionPermute(PetscSection section, IS permutation, PetscSection *sectionNew)
3080: {
3081: PetscSection s = section, sNew;
3082: const PetscInt *perm;
3083: PetscInt numFields, f, c, numPoints, pStart, pEnd, p;
3085: PetscFunctionBegin;
3088: PetscAssertPointer(sectionNew, 3);
3089: PetscCall(PetscSectionCreate(PetscObjectComm((PetscObject)s), &sNew));
3090: PetscCall(PetscSectionGetNumFields(s, &numFields));
3091: if (numFields) PetscCall(PetscSectionSetNumFields(sNew, numFields));
3092: for (f = 0; f < numFields; ++f) {
3093: const char *name;
3094: PetscInt numComp;
3096: PetscCall(PetscSectionGetFieldName(s, f, &name));
3097: PetscCall(PetscSectionSetFieldName(sNew, f, name));
3098: PetscCall(PetscSectionGetFieldComponents(s, f, &numComp));
3099: PetscCall(PetscSectionSetFieldComponents(sNew, f, numComp));
3100: for (c = 0; c < s->numFieldComponents[f]; ++c) {
3101: PetscCall(PetscSectionGetComponentName(s, f, c, &name));
3102: PetscCall(PetscSectionSetComponentName(sNew, f, c, name));
3103: }
3104: }
3105: PetscCall(ISGetLocalSize(permutation, &numPoints));
3106: PetscCall(ISGetIndices(permutation, &perm));
3107: PetscCall(PetscSectionGetChart(s, &pStart, &pEnd));
3108: PetscCall(PetscSectionSetChart(sNew, pStart, pEnd));
3109: PetscCheck(numPoints >= pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "Permutation size %" PetscInt_FMT " is less than largest Section point %" PetscInt_FMT, numPoints, pEnd);
3110: for (p = pStart; p < pEnd; ++p) {
3111: PetscInt dof, cdof;
3113: PetscCall(PetscSectionGetDof(s, p, &dof));
3114: PetscCall(PetscSectionSetDof(sNew, perm[p], dof));
3115: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
3116: if (cdof) PetscCall(PetscSectionSetConstraintDof(sNew, perm[p], cdof));
3117: for (f = 0; f < numFields; ++f) {
3118: PetscCall(PetscSectionGetFieldDof(s, p, f, &dof));
3119: PetscCall(PetscSectionSetFieldDof(sNew, perm[p], f, dof));
3120: PetscCall(PetscSectionGetFieldConstraintDof(s, p, f, &cdof));
3121: if (cdof) PetscCall(PetscSectionSetFieldConstraintDof(sNew, perm[p], f, cdof));
3122: }
3123: }
3124: PetscCall(PetscSectionSetUp(sNew));
3125: for (p = pStart; p < pEnd; ++p) {
3126: const PetscInt *cind;
3127: PetscInt cdof;
3129: PetscCall(PetscSectionGetConstraintDof(s, p, &cdof));
3130: if (cdof) {
3131: PetscCall(PetscSectionGetConstraintIndices(s, p, &cind));
3132: PetscCall(PetscSectionSetConstraintIndices(sNew, perm[p], cind));
3133: }
3134: for (f = 0; f < numFields; ++f) {
3135: PetscCall(PetscSectionGetFieldConstraintDof(s, p, f, &cdof));
3136: if (cdof) {
3137: PetscCall(PetscSectionGetFieldConstraintIndices(s, p, f, &cind));
3138: PetscCall(PetscSectionSetFieldConstraintIndices(sNew, perm[p], f, cind));
3139: }
3140: }
3141: }
3142: PetscCall(ISRestoreIndices(permutation, &perm));
3143: *sectionNew = sNew;
3144: PetscFunctionReturn(PETSC_SUCCESS);
3145: }
3147: /*@
3148: PetscSectionSetClosureIndex - Create an internal data structure to speed up closure queries.
3150: Collective
3152: Input Parameters:
3153: + section - The `PetscSection`
3154: . obj - A `PetscObject` which serves as the key for this index
3155: . clSection - `PetscSection` giving the size of the closure of each point
3156: - clPoints - `IS` giving the points in each closure
3158: Level: advanced
3160: Note:
3161: This function creates an internal map from each point to its closure. We compress out closure points with no dofs in this section.
3163: Developer Notes:
3164: The information provided here is completely opaque
3166: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionGetClosureIndex()`, `DMPlexCreateClosureIndex()`
3167: @*/
3168: PetscErrorCode PetscSectionSetClosureIndex(PetscSection section, PetscObject obj, PetscSection clSection, IS clPoints)
3169: {
3170: PetscFunctionBegin;
3174: if (section->clObj != obj) PetscCall(PetscSectionResetClosurePermutation(section));
3175: section->clObj = obj;
3176: PetscCall(PetscObjectReference((PetscObject)clSection));
3177: PetscCall(PetscObjectReference((PetscObject)clPoints));
3178: PetscCall(PetscSectionDestroy(§ion->clSection));
3179: PetscCall(ISDestroy(§ion->clPoints));
3180: section->clSection = clSection;
3181: section->clPoints = clPoints;
3182: PetscFunctionReturn(PETSC_SUCCESS);
3183: }
3185: /*@
3186: PetscSectionGetClosureIndex - Get the cache of points in the closure of each point in the section set with `PetscSectionSetClosureIndex()`
3188: Collective
3190: Input Parameters:
3191: + section - The `PetscSection`
3192: - obj - A `PetscObject` which serves as the key for this index
3194: Output Parameters:
3195: + clSection - `PetscSection` giving the size of the closure of each point
3196: - clPoints - `IS` giving the points in each closure
3198: Level: advanced
3200: .seealso: [PetscSection](ch_petscsection), `PetscSectionSetClosureIndex()`, `DMPlexCreateClosureIndex()`
3201: @*/
3202: PetscErrorCode PetscSectionGetClosureIndex(PetscSection section, PetscObject obj, PetscSection *clSection, IS *clPoints)
3203: {
3204: PetscFunctionBegin;
3205: if (section->clObj == obj) {
3206: if (clSection) *clSection = section->clSection;
3207: if (clPoints) *clPoints = section->clPoints;
3208: } else {
3209: if (clSection) *clSection = NULL;
3210: if (clPoints) *clPoints = NULL;
3211: }
3212: PetscFunctionReturn(PETSC_SUCCESS);
3213: }
3215: PetscErrorCode PetscSectionSetClosurePermutation_Internal(PetscSection section, PetscObject obj, PetscInt depth, PetscInt clSize, PetscCopyMode mode, PetscInt *clPerm)
3216: {
3217: PetscInt i;
3218: khiter_t iter;
3219: int new_entry;
3220: PetscSectionClosurePermKey key = {depth, clSize};
3221: PetscSectionClosurePermVal *val;
3223: PetscFunctionBegin;
3224: if (section->clObj != obj) {
3225: PetscCall(PetscSectionDestroy(§ion->clSection));
3226: PetscCall(ISDestroy(§ion->clPoints));
3227: }
3228: section->clObj = obj;
3229: if (!section->clHash) PetscCall(PetscClPermCreate(§ion->clHash));
3230: iter = kh_put(ClPerm, section->clHash, key, &new_entry);
3231: val = &kh_val(section->clHash, iter);
3232: if (!new_entry) {
3233: PetscCall(PetscFree(val->perm));
3234: PetscCall(PetscFree(val->invPerm));
3235: }
3236: if (mode == PETSC_COPY_VALUES) {
3237: PetscCall(PetscMalloc1(clSize, &val->perm));
3238: PetscCall(PetscArraycpy(val->perm, clPerm, clSize));
3239: } else if (mode == PETSC_OWN_POINTER) {
3240: val->perm = clPerm;
3241: } else SETERRQ(PetscObjectComm(obj), PETSC_ERR_SUP, "Do not support borrowed arrays");
3242: PetscCall(PetscMalloc1(clSize, &val->invPerm));
3243: for (i = 0; i < clSize; ++i) val->invPerm[clPerm[i]] = i;
3244: PetscFunctionReturn(PETSC_SUCCESS);
3245: }
3247: /*@
3248: PetscSectionSetClosurePermutation - Set the dof permutation for the closure of each cell in the section, meaning clPerm[newIndex] = oldIndex.
3250: Not Collective
3252: Input Parameters:
3253: + section - The `PetscSection`
3254: . obj - A `PetscObject` which serves as the key for this index (usually a `DM`)
3255: . depth - Depth of points on which to apply the given permutation
3256: - perm - Permutation of the cell dof closure
3258: Level: intermediate
3260: Notes:
3261: The specified permutation will only be applied to points at depth whose closure size matches the length of perm. In a
3262: mixed-topology or variable-degree finite element space, this function can be called multiple times at each depth for
3263: each topology and degree.
3265: This approach assumes that (depth, len(perm)) uniquely identifies the desired permutation; this might not be true for
3266: exotic/enriched spaces on mixed topology meshes.
3268: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `IS`, `PetscSectionGetClosurePermutation()`, `PetscSectionGetClosureIndex()`, `DMPlexCreateClosureIndex()`, `PetscCopyMode`
3269: @*/
3270: PetscErrorCode PetscSectionSetClosurePermutation(PetscSection section, PetscObject obj, PetscInt depth, IS perm)
3271: {
3272: const PetscInt *clPerm = NULL;
3273: PetscInt clSize = 0;
3275: PetscFunctionBegin;
3276: if (perm) {
3277: PetscCall(ISGetLocalSize(perm, &clSize));
3278: PetscCall(ISGetIndices(perm, &clPerm));
3279: }
3280: PetscCall(PetscSectionSetClosurePermutation_Internal(section, obj, depth, clSize, PETSC_COPY_VALUES, (PetscInt *)clPerm));
3281: if (perm) PetscCall(ISRestoreIndices(perm, &clPerm));
3282: PetscFunctionReturn(PETSC_SUCCESS);
3283: }
3285: static PetscErrorCode PetscSectionGetClosurePermutation_Private(PetscSection section, PetscObject obj, PetscInt depth, PetscInt size, const PetscInt *perm[])
3286: {
3287: PetscFunctionBegin;
3288: if (section->clObj == obj) {
3289: PetscSectionClosurePermKey k = {depth, size};
3290: PetscSectionClosurePermVal v;
3292: PetscCall(PetscClPermGet(section->clHash, k, &v));
3293: if (perm) *perm = v.perm;
3294: } else {
3295: if (perm) *perm = NULL;
3296: }
3297: PetscFunctionReturn(PETSC_SUCCESS);
3298: }
3300: /*@
3301: PetscSectionGetClosurePermutation - Get the dof permutation for the closure of each cell in the section, meaning clPerm[newIndex] = oldIndex.
3303: Not Collective
3305: Input Parameters:
3306: + section - The `PetscSection`
3307: . obj - A `PetscObject` which serves as the key for this index (usually a DM)
3308: . depth - Depth stratum on which to obtain closure permutation
3309: - clSize - Closure size to be permuted (e.g., may vary with element topology and degree)
3311: Output Parameter:
3312: . perm - The dof closure permutation
3314: Level: intermediate
3316: Note:
3317: The user must destroy the `IS` that is returned.
3319: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `IS`, `PetscSectionSetClosurePermutation()`, `PetscSectionGetClosureInversePermutation()`, `PetscSectionGetClosureIndex()`, `PetscSectionSetClosureIndex()`, `DMPlexCreateClosureIndex()`
3320: @*/
3321: PetscErrorCode PetscSectionGetClosurePermutation(PetscSection section, PetscObject obj, PetscInt depth, PetscInt clSize, IS *perm)
3322: {
3323: const PetscInt *clPerm = NULL;
3325: PetscFunctionBegin;
3326: PetscCall(PetscSectionGetClosurePermutation_Private(section, obj, depth, clSize, &clPerm));
3327: PetscCheck(clPerm, PetscObjectComm(obj), PETSC_ERR_ARG_WRONG, "There is no closure permutation associated with this object for depth %" PetscInt_FMT " of size %" PetscInt_FMT, depth, clSize);
3328: PetscCall(ISCreateGeneral(PETSC_COMM_SELF, clSize, clPerm, PETSC_USE_POINTER, perm));
3329: PetscFunctionReturn(PETSC_SUCCESS);
3330: }
3332: PetscErrorCode PetscSectionGetClosureInversePermutation_Internal(PetscSection section, PetscObject obj, PetscInt depth, PetscInt size, const PetscInt *perm[])
3333: {
3334: PetscFunctionBegin;
3335: if (section->clObj == obj && section->clHash) {
3336: PetscSectionClosurePermKey k = {depth, size};
3337: PetscSectionClosurePermVal v;
3338: PetscCall(PetscClPermGet(section->clHash, k, &v));
3339: if (perm) *perm = v.invPerm;
3340: } else {
3341: if (perm) *perm = NULL;
3342: }
3343: PetscFunctionReturn(PETSC_SUCCESS);
3344: }
3346: /*@
3347: PetscSectionGetClosureInversePermutation - Get the inverse dof permutation for the closure of each cell in the section, meaning clPerm[oldIndex] = newIndex.
3349: Not Collective
3351: Input Parameters:
3352: + section - The `PetscSection`
3353: . obj - A `PetscObject` which serves as the key for this index (usually a `DM`)
3354: . depth - Depth stratum on which to obtain closure permutation
3355: - clSize - Closure size to be permuted (e.g., may vary with element topology and degree)
3357: Output Parameter:
3358: . perm - The dof closure permutation
3360: Level: intermediate
3362: Note:
3363: The user must destroy the `IS` that is returned.
3365: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `IS`, `PetscSectionSetClosurePermutation()`, `PetscSectionGetClosureIndex()`, `PetscSectionSetClosureIndex()`, `DMPlexCreateClosureIndex()`
3366: @*/
3367: PetscErrorCode PetscSectionGetClosureInversePermutation(PetscSection section, PetscObject obj, PetscInt depth, PetscInt clSize, IS *perm)
3368: {
3369: const PetscInt *clPerm = NULL;
3371: PetscFunctionBegin;
3372: PetscCall(PetscSectionGetClosureInversePermutation_Internal(section, obj, depth, clSize, &clPerm));
3373: PetscCall(ISCreateGeneral(PETSC_COMM_SELF, clSize, clPerm, PETSC_USE_POINTER, perm));
3374: PetscFunctionReturn(PETSC_SUCCESS);
3375: }
3377: /*@
3378: PetscSectionGetField - Get the `PetscSection` associated with a single field
3380: Input Parameters:
3381: + s - The `PetscSection`
3382: - field - The field number
3384: Output Parameter:
3385: . subs - The `PetscSection` for the given field, note the chart of `subs` is not set
3387: Level: intermediate
3389: Note:
3390: Does not increase the reference count of the selected sub-section. There is no matching `PetscSectionRestoreField()`
3392: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `IS`, `PetscSectionSetNumFields()`
3393: @*/
3394: PetscErrorCode PetscSectionGetField(PetscSection s, PetscInt field, PetscSection *subs)
3395: {
3396: PetscFunctionBegin;
3398: PetscAssertPointer(subs, 3);
3399: PetscSectionCheckValidField(field, s->numFields);
3400: *subs = s->field[field];
3401: PetscFunctionReturn(PETSC_SUCCESS);
3402: }
3404: PetscClassId PETSC_SECTION_SYM_CLASSID;
3405: PetscFunctionList PetscSectionSymList = NULL;
3407: /*@
3408: PetscSectionSymCreate - Creates an empty `PetscSectionSym` object.
3410: Collective
3412: Input Parameter:
3413: . comm - the MPI communicator
3415: Output Parameter:
3416: . sym - pointer to the new set of symmetries
3418: Level: developer
3420: .seealso: [PetscSection](ch_petscsection), `PetscSection`, `PetscSectionSym`, `PetscSectionSymDestroy()`
3421: @*/
3422: PetscErrorCode PetscSectionSymCreate(MPI_Comm comm, PetscSectionSym *sym)
3423: {
3424: PetscFunctionBegin;
3425: PetscAssertPointer(sym, 2);
3426: PetscCall(ISInitializePackage());
3428: PetscCall(PetscHeaderCreate(*sym, PETSC_SECTION_SYM_CLASSID, "PetscSectionSym", "Section Symmetry", "IS", comm, PetscSectionSymDestroy, PetscSectionSymView));
3429: PetscFunctionReturn(PETSC_SUCCESS);
3430: }
3432: /*@
3433: PetscSectionSymSetType - Builds a `PetscSectionSym`, for a particular implementation.
3435: Collective
3437: Input Parameters:
3438: + sym - The section symmetry object
3439: - method - The name of the section symmetry type
3441: Level: developer
3443: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymType`, `PetscSectionSymGetType()`, `PetscSectionSymCreate()`
3444: @*/
3445: PetscErrorCode PetscSectionSymSetType(PetscSectionSym sym, PetscSectionSymType method)
3446: {
3447: PetscErrorCode (*r)(PetscSectionSym);
3448: PetscBool match;
3450: PetscFunctionBegin;
3452: PetscCall(PetscObjectTypeCompare((PetscObject)sym, method, &match));
3453: if (match) PetscFunctionReturn(PETSC_SUCCESS);
3455: PetscCall(PetscFunctionListFind(PetscSectionSymList, method, &r));
3456: PetscCheck(r, PetscObjectComm((PetscObject)sym), PETSC_ERR_ARG_UNKNOWN_TYPE, "Unknown PetscSectionSym type: %s", method);
3457: PetscTryTypeMethod(sym, destroy);
3458: sym->ops->destroy = NULL;
3460: PetscCall((*r)(sym));
3461: PetscCall(PetscObjectChangeTypeName((PetscObject)sym, method));
3462: PetscFunctionReturn(PETSC_SUCCESS);
3463: }
3465: /*@
3466: PetscSectionSymGetType - Gets the section symmetry type name (as a string) from the `PetscSectionSym`.
3468: Not Collective
3470: Input Parameter:
3471: . sym - The section symmetry
3473: Output Parameter:
3474: . type - The index set type name
3476: Level: developer
3478: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymType`, `PetscSectionSymSetType()`, `PetscSectionSymCreate()`
3479: @*/
3480: PetscErrorCode PetscSectionSymGetType(PetscSectionSym sym, PetscSectionSymType *type)
3481: {
3482: PetscFunctionBegin;
3484: PetscAssertPointer(type, 2);
3485: *type = ((PetscObject)sym)->type_name;
3486: PetscFunctionReturn(PETSC_SUCCESS);
3487: }
3489: /*@C
3490: PetscSectionSymRegister - Registers a new section symmetry implementation
3492: Not Collective, No Fortran Support
3494: Input Parameters:
3495: + sname - The name of a new user-defined creation routine
3496: - function - The creation routine itself
3498: Level: developer
3500: Notes:
3501: `PetscSectionSymRegister()` may be called multiple times to add several user-defined vectors
3503: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymType`, `PetscSectionSymCreate()`, `PetscSectionSymSetType()`
3504: @*/
3505: PetscErrorCode PetscSectionSymRegister(const char sname[], PetscErrorCode (*function)(PetscSectionSym))
3506: {
3507: PetscFunctionBegin;
3508: PetscCall(ISInitializePackage());
3509: PetscCall(PetscFunctionListAdd(&PetscSectionSymList, sname, function));
3510: PetscFunctionReturn(PETSC_SUCCESS);
3511: }
3513: /*@
3514: PetscSectionSymDestroy - Destroys a section symmetry.
3516: Collective
3518: Input Parameter:
3519: . sym - the section symmetry
3521: Level: developer
3523: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymCreate()`
3524: @*/
3525: PetscErrorCode PetscSectionSymDestroy(PetscSectionSym *sym)
3526: {
3527: SymWorkLink link, next;
3529: PetscFunctionBegin;
3530: if (!*sym) PetscFunctionReturn(PETSC_SUCCESS);
3532: if (--((PetscObject)*sym)->refct > 0) {
3533: *sym = NULL;
3534: PetscFunctionReturn(PETSC_SUCCESS);
3535: }
3536: PetscTryTypeMethod(*sym, destroy);
3537: PetscCheck(!(*sym)->workout, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Work array still checked out");
3538: for (link = (*sym)->workin; link; link = next) {
3539: PetscInt **perms = (PetscInt **)link->perms;
3540: PetscScalar **rots = (PetscScalar **)link->rots;
3541: PetscCall(PetscFree2(perms, rots));
3542: next = link->next;
3543: PetscCall(PetscFree(link));
3544: }
3545: (*sym)->workin = NULL;
3546: PetscCall(PetscHeaderDestroy(sym));
3547: PetscFunctionReturn(PETSC_SUCCESS);
3548: }
3550: /*@
3551: PetscSectionSymView - Displays a section symmetry
3553: Collective
3555: Input Parameters:
3556: + sym - the index set
3557: - viewer - viewer used to display the set, for example `PETSC_VIEWER_STDOUT_SELF`.
3559: Level: developer
3561: .seealso: `PetscSectionSym`, `PetscViewer`, `PetscViewerASCIIOpen()`
3562: @*/
3563: PetscErrorCode PetscSectionSymView(PetscSectionSym sym, PetscViewer viewer)
3564: {
3565: PetscFunctionBegin;
3567: if (!viewer) PetscCall(PetscViewerASCIIGetStdout(PetscObjectComm((PetscObject)sym), &viewer));
3569: PetscCheckSameComm(sym, 1, viewer, 2);
3570: PetscCall(PetscObjectPrintClassNamePrefixType((PetscObject)sym, viewer));
3571: PetscTryTypeMethod(sym, view, viewer);
3572: PetscFunctionReturn(PETSC_SUCCESS);
3573: }
3575: /*@
3576: PetscSectionSetSym - Set the symmetries for the data referred to by the section
3578: Collective
3580: Input Parameters:
3581: + section - the section describing data layout
3582: - sym - the symmetry describing the affect of orientation on the access of the data
3584: Level: developer
3586: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetSym()`, `PetscSectionSymCreate()`
3587: @*/
3588: PetscErrorCode PetscSectionSetSym(PetscSection section, PetscSectionSym sym)
3589: {
3590: PetscFunctionBegin;
3592: PetscCall(PetscSectionSymDestroy(§ion->sym));
3593: if (sym) {
3595: PetscCheckSameComm(section, 1, sym, 2);
3596: PetscCall(PetscObjectReference((PetscObject)sym));
3597: }
3598: section->sym = sym;
3599: PetscFunctionReturn(PETSC_SUCCESS);
3600: }
3602: /*@
3603: PetscSectionGetSym - Get the symmetries for the data referred to by the section
3605: Not Collective
3607: Input Parameter:
3608: . section - the section describing data layout
3610: Output Parameter:
3611: . sym - the symmetry describing the affect of orientation on the access of the data, provided previously by `PetscSectionSetSym()`
3613: Level: developer
3615: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSetSym()`, `PetscSectionSymCreate()`
3616: @*/
3617: PetscErrorCode PetscSectionGetSym(PetscSection section, PetscSectionSym *sym)
3618: {
3619: PetscFunctionBegin;
3621: *sym = section->sym;
3622: PetscFunctionReturn(PETSC_SUCCESS);
3623: }
3625: /*@
3626: PetscSectionSetFieldSym - Set the symmetries for the data referred to by a field of the section
3628: Collective
3630: Input Parameters:
3631: + section - the section describing data layout
3632: . field - the field number
3633: - sym - the symmetry describing the affect of orientation on the access of the data
3635: Level: developer
3637: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetFieldSym()`, `PetscSectionSymCreate()`
3638: @*/
3639: PetscErrorCode PetscSectionSetFieldSym(PetscSection section, PetscInt field, PetscSectionSym sym)
3640: {
3641: PetscFunctionBegin;
3643: PetscSectionCheckValidField(field, section->numFields);
3644: PetscCall(PetscSectionSetSym(section->field[field], sym));
3645: PetscFunctionReturn(PETSC_SUCCESS);
3646: }
3648: /*@
3649: PetscSectionGetFieldSym - Get the symmetries for the data referred to by a field of the section
3651: Collective
3653: Input Parameters:
3654: + section - the section describing data layout
3655: - field - the field number
3657: Output Parameter:
3658: . sym - the symmetry describing the affect of orientation on the access of the data
3660: Level: developer
3662: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSetFieldSym()`, `PetscSectionSymCreate()`
3663: @*/
3664: PetscErrorCode PetscSectionGetFieldSym(PetscSection section, PetscInt field, PetscSectionSym *sym)
3665: {
3666: PetscFunctionBegin;
3668: PetscSectionCheckValidField(field, section->numFields);
3669: *sym = section->field[field]->sym;
3670: PetscFunctionReturn(PETSC_SUCCESS);
3671: }
3673: /*@C
3674: PetscSectionGetPointSyms - Get the symmetries for a set of points in a `PetscSection` under specific orientations.
3676: Not Collective
3678: Input Parameters:
3679: + section - the section
3680: . numPoints - the number of points
3681: - points - an array of size 2 * `numPoints`, containing a list of (point, orientation) pairs. (An orientation is an
3682: arbitrary integer: its interpretation is up to sym. Orientations are used by `DM`: for their interpretation in that
3683: context, see `DMPlexGetConeOrientation()`).
3685: Output Parameters:
3686: + perms - The permutations for the given orientations (or `NULL` if there is no symmetry or the permutation is the identity).
3687: - rots - The field rotations symmetries for the given orientations (or `NULL` if there is no symmetry or the rotations are all
3688: identity).
3690: Example of usage, gathering dofs into a local array (lArray) from a section array (sArray):
3691: .vb
3692: const PetscInt **perms;
3693: const PetscScalar **rots;
3694: PetscInt lOffset;
3696: PetscSectionGetPointSyms(section,numPoints,points,&perms,&rots);
3697: for (i = 0, lOffset = 0; i < numPoints; i++) {
3698: PetscInt point = points[2*i], dof, sOffset;
3699: const PetscInt *perm = perms ? perms[i] : NULL;
3700: const PetscScalar *rot = rots ? rots[i] : NULL;
3702: PetscSectionGetDof(section,point,&dof);
3703: PetscSectionGetOffset(section,point,&sOffset);
3705: if (perm) { for (j = 0; j < dof; j++) lArray[lOffset + perm[j]] = sArray[sOffset + j]; }
3706: else { for (j = 0; j < dof; j++) lArray[lOffset + j ] = sArray[sOffset + j]; }
3707: if (rot) { for (j = 0; j < dof; j++) lArray[lOffset + j ] *= rot[j]; }
3708: lOffset += dof;
3709: }
3710: PetscSectionRestorePointSyms(section,numPoints,points,&perms,&rots);
3711: .ve
3713: Example of usage, adding dofs into a section array (sArray) from a local array (lArray):
3714: .vb
3715: const PetscInt **perms;
3716: const PetscScalar **rots;
3717: PetscInt lOffset;
3719: PetscSectionGetPointSyms(section,numPoints,points,&perms,&rots);
3720: for (i = 0, lOffset = 0; i < numPoints; i++) {
3721: PetscInt point = points[2*i], dof, sOffset;
3722: const PetscInt *perm = perms ? perms[i] : NULL;
3723: const PetscScalar *rot = rots ? rots[i] : NULL;
3725: PetscSectionGetDof(section,point,&dof);
3726: PetscSectionGetOffset(section,point,&sOff);
3728: if (perm) { for (j = 0; j < dof; j++) sArray[sOffset + j] += lArray[lOffset + perm[j]] * (rot ? PetscConj(rot[perm[j]]) : 1.); }
3729: else { for (j = 0; j < dof; j++) sArray[sOffset + j] += lArray[lOffset + j ] * (rot ? PetscConj(rot[ j ]) : 1.); }
3730: offset += dof;
3731: }
3732: PetscSectionRestorePointSyms(section,numPoints,points,&perms,&rots);
3733: .ve
3735: Level: developer
3737: Notes:
3738: `PetscSectionSetSym()` must have been previously called to provide the symmetries to the `PetscSection`
3740: Use `PetscSectionRestorePointSyms()` when finished with the data
3742: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionRestorePointSyms()`, `PetscSectionSymCreate()`, `PetscSectionSetSym()`, `PetscSectionGetSym()`
3743: @*/
3744: PetscErrorCode PetscSectionGetPointSyms(PetscSection section, PetscInt numPoints, const PetscInt *points, const PetscInt ***perms, const PetscScalar ***rots)
3745: {
3746: PetscSectionSym sym;
3748: PetscFunctionBegin;
3750: if (numPoints) PetscAssertPointer(points, 3);
3751: if (perms) *perms = NULL;
3752: if (rots) *rots = NULL;
3753: sym = section->sym;
3754: if (sym && (perms || rots)) {
3755: SymWorkLink link;
3757: if (sym->workin) {
3758: link = sym->workin;
3759: sym->workin = sym->workin->next;
3760: } else {
3761: PetscCall(PetscNew(&link));
3762: }
3763: if (numPoints > link->numPoints) {
3764: PetscInt **perms = (PetscInt **)link->perms;
3765: PetscScalar **rots = (PetscScalar **)link->rots;
3766: PetscCall(PetscFree2(perms, rots));
3767: PetscCall(PetscMalloc2(numPoints, (PetscInt ***)&link->perms, numPoints, (PetscScalar ***)&link->rots));
3768: link->numPoints = numPoints;
3769: }
3770: link->next = sym->workout;
3771: sym->workout = link;
3772: PetscCall(PetscArrayzero((PetscInt **)link->perms, numPoints));
3773: PetscCall(PetscArrayzero((PetscInt **)link->rots, numPoints));
3774: PetscUseTypeMethod(sym, getpoints, section, numPoints, points, link->perms, link->rots);
3775: if (perms) *perms = link->perms;
3776: if (rots) *rots = link->rots;
3777: }
3778: PetscFunctionReturn(PETSC_SUCCESS);
3779: }
3781: /*@C
3782: PetscSectionRestorePointSyms - Restore the symmetries returned by `PetscSectionGetPointSyms()`
3784: Not Collective
3786: Input Parameters:
3787: + section - the section
3788: . numPoints - the number of points
3789: . points - an array of size 2 * `numPoints`, containing a list of (point, orientation) pairs. (An orientation is an
3790: arbitrary integer: its interpretation is up to sym. Orientations are used by `DM`: for their interpretation in that
3791: context, see `DMPlexGetConeOrientation()`).
3792: . perms - The permutations for the given orientations: set to `NULL` at conclusion
3793: - rots - The field rotations symmetries for the given orientations: set to `NULL` at conclusion
3795: Level: developer
3797: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetPointSyms()`, `PetscSectionSymCreate()`, `PetscSectionSetSym()`, `PetscSectionGetSym()`
3798: @*/
3799: PetscErrorCode PetscSectionRestorePointSyms(PetscSection section, PetscInt numPoints, const PetscInt *points, const PetscInt ***perms, const PetscScalar ***rots)
3800: {
3801: PetscSectionSym sym;
3803: PetscFunctionBegin;
3805: sym = section->sym;
3806: if (sym && (perms || rots)) {
3807: SymWorkLink *p, link;
3809: for (p = &sym->workout; (link = *p); p = &link->next) {
3810: if ((perms && link->perms == *perms) || (rots && link->rots == *rots)) {
3811: *p = link->next;
3812: link->next = sym->workin;
3813: sym->workin = link;
3814: if (perms) *perms = NULL;
3815: if (rots) *rots = NULL;
3816: PetscFunctionReturn(PETSC_SUCCESS);
3817: }
3818: }
3819: SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Array was not checked out");
3820: }
3821: PetscFunctionReturn(PETSC_SUCCESS);
3822: }
3824: /*@C
3825: PetscSectionGetFieldPointSyms - Get the symmetries for a set of points in a field of a `PetscSection` under specific orientations.
3827: Not Collective
3829: Input Parameters:
3830: + section - the section
3831: . field - the field of the section
3832: . numPoints - the number of points
3833: - points - an array of size 2 * `numPoints`, containing a list of (point, orientation) pairs. (An orientation is an
3834: arbitrary integer: its interpretation is up to sym. Orientations are used by `DM`: for their interpretation in that
3835: context, see `DMPlexGetConeOrientation()`).
3837: Output Parameters:
3838: + perms - The permutations for the given orientations (or `NULL` if there is no symmetry or the permutation is the identity).
3839: - rots - The field rotations symmetries for the given orientations (or `NULL` if there is no symmetry or the rotations are all
3840: identity).
3842: Level: developer
3844: Notes:
3845: `PetscSectionSetFieldSym()` must have been previously called to provide the symmetries to the `PetscSection`
3847: Use `PetscSectionRestoreFieldPointSyms()` when finished with the data
3849: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetPointSyms()`, `PetscSectionRestoreFieldPointSyms()`
3850: @*/
3851: PetscErrorCode PetscSectionGetFieldPointSyms(PetscSection section, PetscInt field, PetscInt numPoints, const PetscInt *points, const PetscInt ***perms, const PetscScalar ***rots)
3852: {
3853: PetscFunctionBegin;
3855: PetscCheck(field <= section->numFields, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "field %" PetscInt_FMT " greater than number of fields (%" PetscInt_FMT ") in section", field, section->numFields);
3856: PetscCall(PetscSectionGetPointSyms(section->field[field], numPoints, points, perms, rots));
3857: PetscFunctionReturn(PETSC_SUCCESS);
3858: }
3860: /*@C
3861: PetscSectionRestoreFieldPointSyms - Restore the symmetries returned by `PetscSectionGetFieldPointSyms()`
3863: Not Collective
3865: Input Parameters:
3866: + section - the section
3867: . field - the field number
3868: . numPoints - the number of points
3869: . points - an array of size 2 * `numPoints`, containing a list of (point, orientation) pairs. (An orientation is an
3870: arbitrary integer: its interpretation is up to sym. Orientations are used by `DM`: for their interpretation in that
3871: context, see `DMPlexGetConeOrientation()`).
3872: . perms - The permutations for the given orientations: set to NULL at conclusion
3873: - rots - The field rotations symmetries for the given orientations: set to NULL at conclusion
3875: Level: developer
3877: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionRestorePointSyms()`, `petscSectionGetFieldPointSyms()`, `PetscSectionSymCreate()`, `PetscSectionSetSym()`, `PetscSectionGetSym()`
3878: @*/
3879: PetscErrorCode PetscSectionRestoreFieldPointSyms(PetscSection section, PetscInt field, PetscInt numPoints, const PetscInt *points, const PetscInt ***perms, const PetscScalar ***rots)
3880: {
3881: PetscFunctionBegin;
3883: PetscCheck(field <= section->numFields, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "field %" PetscInt_FMT " greater than number of fields (%" PetscInt_FMT ") in section", field, section->numFields);
3884: PetscCall(PetscSectionRestorePointSyms(section->field[field], numPoints, points, perms, rots));
3885: PetscFunctionReturn(PETSC_SUCCESS);
3886: }
3888: /*@
3889: PetscSectionSymCopy - Copy the symmetries, assuming that the point structure is compatible
3891: Not Collective
3893: Input Parameter:
3894: . sym - the `PetscSectionSym`
3896: Output Parameter:
3897: . nsym - the equivalent symmetries
3899: Level: developer
3901: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymCreate()`, `PetscSectionSetSym()`, `PetscSectionGetSym()`, `PetscSectionSymLabelSetStratum()`, `PetscSectionGetPointSyms()`
3902: @*/
3903: PetscErrorCode PetscSectionSymCopy(PetscSectionSym sym, PetscSectionSym nsym)
3904: {
3905: PetscFunctionBegin;
3908: PetscTryTypeMethod(sym, copy, nsym);
3909: PetscFunctionReturn(PETSC_SUCCESS);
3910: }
3912: /*@
3913: PetscSectionSymDistribute - Distribute the symmetries in accordance with the input `PetscSF`
3915: Collective
3917: Input Parameters:
3918: + sym - the `PetscSectionSym`
3919: - migrationSF - the distribution map from roots to leaves
3921: Output Parameter:
3922: . dsym - the redistributed symmetries
3924: Level: developer
3926: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSymCreate()`, `PetscSectionSetSym()`, `PetscSectionGetSym()`, `PetscSectionSymLabelSetStratum()`, `PetscSectionGetPointSyms()`
3927: @*/
3928: PetscErrorCode PetscSectionSymDistribute(PetscSectionSym sym, PetscSF migrationSF, PetscSectionSym *dsym)
3929: {
3930: PetscFunctionBegin;
3933: PetscAssertPointer(dsym, 3);
3934: PetscTryTypeMethod(sym, distribute, migrationSF, dsym);
3935: PetscFunctionReturn(PETSC_SUCCESS);
3936: }
3938: /*@
3939: PetscSectionGetUseFieldOffsets - Get the flag indicating if field offsets are used directly in a global section, rather than just the point offset
3941: Not Collective
3943: Input Parameter:
3944: . s - the global `PetscSection`
3946: Output Parameter:
3947: . flg - the flag
3949: Level: developer
3951: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionSetChart()`, `PetscSectionCreate()`
3952: @*/
3953: PetscErrorCode PetscSectionGetUseFieldOffsets(PetscSection s, PetscBool *flg)
3954: {
3955: PetscFunctionBegin;
3957: *flg = s->useFieldOff;
3958: PetscFunctionReturn(PETSC_SUCCESS);
3959: }
3961: /*@
3962: PetscSectionSetUseFieldOffsets - Set the flag to use field offsets directly in a global section, rather than just the point offset
3964: Not Collective
3966: Input Parameters:
3967: + s - the global `PetscSection`
3968: - flg - the flag
3970: Level: developer
3972: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetUseFieldOffsets()`, `PetscSectionSetChart()`, `PetscSectionCreate()`
3973: @*/
3974: PetscErrorCode PetscSectionSetUseFieldOffsets(PetscSection s, PetscBool flg)
3975: {
3976: PetscFunctionBegin;
3978: s->useFieldOff = flg;
3979: PetscFunctionReturn(PETSC_SUCCESS);
3980: }
3982: #define PetscSectionExpandPoints_Loop(TYPE) \
3983: do { \
3984: PetscInt i, n, o0, o1, size; \
3985: TYPE *a0 = (TYPE *)origArray, *a1; \
3986: PetscCall(PetscSectionGetStorageSize(s, &size)); \
3987: PetscCall(PetscMalloc1(size, &a1)); \
3988: for (i = 0; i < npoints; i++) { \
3989: PetscCall(PetscSectionGetOffset(origSection, points_[i], &o0)); \
3990: PetscCall(PetscSectionGetOffset(s, i, &o1)); \
3991: PetscCall(PetscSectionGetDof(s, i, &n)); \
3992: PetscCall(PetscMemcpy(&a1[o1], &a0[o0], n * unitsize)); \
3993: } \
3994: *newArray = (void *)a1; \
3995: } while (0)
3997: /*@
3998: PetscSectionExtractDofsFromArray - Extracts elements of an array corresponding to DOFs of specified points.
4000: Not Collective
4002: Input Parameters:
4003: + origSection - the `PetscSection` describing the layout of the array
4004: . dataType - `MPI_Datatype` describing the data type of the array (currently only `MPIU_INT`, `MPIU_SCALAR`, `MPIU_REAL`)
4005: . origArray - the array; its size must be equal to the storage size of `origSection`
4006: - points - `IS` with points to extract; its indices must lie in the chart of `origSection`
4008: Output Parameters:
4009: + newSection - the new `PetscSection` describing the layout of the new array (with points renumbered 0,1,... but preserving numbers of DOFs)
4010: - newArray - the array of the extracted DOFs; its size is the storage size of `newSection`
4012: Level: developer
4014: .seealso: [PetscSection](ch_petscsection), `PetscSectionSym`, `PetscSectionGetChart()`, `PetscSectionGetDof()`, `PetscSectionGetStorageSize()`, `PetscSectionCreate()`
4015: @*/
4016: PetscErrorCode PetscSectionExtractDofsFromArray(PetscSection origSection, MPI_Datatype dataType, const void *origArray, IS points, PetscSection *newSection, void *newArray[])
4017: {
4018: PetscSection s;
4019: const PetscInt *points_;
4020: PetscInt i, n, npoints, pStart, pEnd;
4021: PetscMPIInt unitsize;
4023: PetscFunctionBegin;
4025: PetscAssertPointer(origArray, 3);
4027: if (newSection) PetscAssertPointer(newSection, 5);
4028: if (newArray) PetscAssertPointer(newArray, 6);
4029: PetscCallMPI(MPI_Type_size(dataType, &unitsize));
4030: PetscCall(ISGetLocalSize(points, &npoints));
4031: PetscCall(ISGetIndices(points, &points_));
4032: PetscCall(PetscSectionGetChart(origSection, &pStart, &pEnd));
4033: PetscCall(PetscSectionCreate(PETSC_COMM_SELF, &s));
4034: PetscCall(PetscSectionSetChart(s, 0, npoints));
4035: for (i = 0; i < npoints; i++) {
4036: PetscCheck(points_[i] >= pStart && points_[i] < pEnd, PETSC_COMM_SELF, PETSC_ERR_ARG_OUTOFRANGE, "point %" PetscInt_FMT " (index %" PetscInt_FMT ") in input IS out of input section's chart", points_[i], i);
4037: PetscCall(PetscSectionGetDof(origSection, points_[i], &n));
4038: PetscCall(PetscSectionSetDof(s, i, n));
4039: }
4040: PetscCall(PetscSectionSetUp(s));
4041: if (newArray) {
4042: if (dataType == MPIU_INT) {
4043: PetscSectionExpandPoints_Loop(PetscInt);
4044: } else if (dataType == MPIU_SCALAR) {
4045: PetscSectionExpandPoints_Loop(PetscScalar);
4046: } else if (dataType == MPIU_REAL) {
4047: PetscSectionExpandPoints_Loop(PetscReal);
4048: } else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_SUP, "not implemented for this MPI_Datatype");
4049: }
4050: if (newSection) {
4051: *newSection = s;
4052: } else {
4053: PetscCall(PetscSectionDestroy(&s));
4054: }
4055: PetscCall(ISRestoreIndices(points, &points_));
4056: PetscFunctionReturn(PETSC_SUCCESS);
4057: }