2: /* degree.f -- translated by f2c (version 19931217).*/
4: #include <petsc/private/matorderimpl.h>
6: /*****************************************************************/
7: /********* DEGREE ..... DEGREE IN MASKED COMPONENT *********/
8: /*****************************************************************/
10: /* PURPOSE - THIS ROUTINE COMPUTES THE DEGREES OF THE NODES*/
11: /* IN THE CONNECTED COMPONENT SPECIFIED BY MASK AND ../../..*/
12: /* NODES FOR WHICH MASK IS ZERO ARE IGNORED.*/
14: /* INPUT PARAMETER -*/
15: /* ../../.. - IS THE INPUT NODE THAT DEFINES THE COMPONENT.*/
16: /* (XADJ, ADJNCY) - ADJACENCY STRUCTURE PAIR.*/
17: /* MASK - SPECIFIES A SECTION SUBGRAPH.*/
19: /* OUTPUT PARAMETERS -*/
20: /* DEG - ARRAY CONTAINING THE DEGREES OF THE NODES IN*/
21: /* THE COMPONENT.*/
22: /* CCSIZE-SIZE OF THE COMPONENT SPECIFED BY MASK AND ../../..*/
23: /* WORKING PARAMETER -*/
24: /* LS - A TEMPORARY VECTOR USED TO STORE THE NODES OF THE*/
25: /* COMPONENT LEVEL BY LEVEL.*/
26: /*****************************************************************/
29: PetscErrorCode SPARSEPACKdegree(const PetscInt *root,const PetscInt *inxadj,const PetscInt *adjncy,PetscInt *mask,PetscInt *deg,PetscInt *ccsize,PetscInt *ls) 30: {
31: PetscInt *xadj = (PetscInt*)inxadj; /* Used as temporary and reset within this function */
32: /* System generated locals */
33: PetscInt i__1,i__2;
35: /* Local variables */
36: PetscInt ideg,node,i,j,jstop,jstrt,lbegin,lvlend,lvsize,nbr;
37: /* INITIALIZATION ...*/
38: /* THE ARRAY XADJ IS USED AS A TEMPORARY MARKER TO*/
39: /* INDICATE WHICH NODES HAVE BEEN CONSIDERED SO FAR.*/
42: /* Parameter adjustments */
43: --ls;
44: --deg;
45: --mask;
46: --adjncy;
47: --xadj;
49: ls[1] = *root;
50: xadj[*root] = -xadj[*root];
51: lvlend = 0;
52: *ccsize = 1;
53: /* LBEGIN IS THE POINTER TO THE BEGINNING OF THE CURRENT*/
54: /* LEVEL, AND LVLEND POINTS TO THE END OF THIS LEVEL.*/
55: L100: 56: lbegin = lvlend + 1;
57: lvlend = *ccsize;
58: /* FIND THE DEGREES OF NODES IN THE CURRENT LEVEL,*/
59: /* AND AT THE SAME TIME, GENERATE THE NEXT LEVEL.*/
60: i__1 = lvlend;
61: for (i = lbegin; i <= i__1; ++i) {
62: node = ls[i];
63: jstrt = -xadj[node];
64: jstop = (i__2 = xadj[node + 1], (PetscInt)PetscAbsInt(i__2)) - 1;
65: ideg = 0;
66: if (jstop < jstrt) goto L300;
67: i__2 = jstop;
68: for (j = jstrt; j <= i__2; ++j) {
69: nbr = adjncy[j];
70: if (!mask[nbr]) goto L200;
71: ++ideg;
72: if (xadj[nbr] < 0) goto L200;
73: xadj[nbr] = -xadj[nbr];
74: ++(*ccsize);
75: ls[*ccsize] = nbr;
76: L200: 77: ;
78: }
79: L300: 80: deg[node] = ideg;
81: }
82: /* COMPUTE THE CURRENT LEVEL WIDTH. */
83: /* IF IT IS NONZERO, GENERATE ANOTHER LEVEL.*/
84: lvsize = *ccsize - lvlend;
85: if (lvsize > 0) goto L100;
86: /* RESET XADJ TO ITS CORRECT SIGN AND RETURN. */
87: /* ------------------------------------------*/
88: i__1 = *ccsize;
89: for (i = 1; i <= i__1; ++i) {
90: node = ls[i];
91: xadj[node] = -xadj[node];
92: }
93: return(0);
94: }