petsc-3.14.6 2021-03-30
DMCreateSubDM
Returns an IS and DM encapsulating a subproblem defined by the fields passed in. The fields are defined by DMCreateFieldIS().
Synopsis
#include "petscdm.h"
#include "petscdmlabel.h"
#include "petscds.h"
PetscErrorCode DMCreateSubDM(DM dm, PetscInt numFields, const PetscInt fields[], IS *is, DM *subdm)
Not collective
Input Parameters
| dm | - The DM object
|
| numFields | - The number of fields in this subproblem
|
| fields | - The field numbers of the selected fields
|
Output Parameters
| is | - The global indices for the subproblem
|
| subdm | - The DM for the subproblem
|
Note: You need to call DMPlexSetMigrationSF() on the original DM if you want the Global-To-Natural map to be automatically constructed
See Also
DMPlexSetMigrationSF(), DMDestroy(), DMView(), DMCreateInterpolation(), DMCreateColoring(), DMCreateMatrix(), DMCreateFieldIS()
Level
intermediate
Location
src/dm/interface/dm.c
Examples
src/snes/tutorials/ex56.c.html
src/snes/tutorials/ex77.c.html
Implementations
DMCreateSubDM_DA in src/dm/impls/da/dacreate.c
DMCreateSubDM_Forest in src/dm/impls/forest/forest.c
DMCreateSubDM_Patch in src/dm/impls/patch/patch.c
DMCreateSubDM_Plex in src/dm/impls/plex/plex.c
DMCreateSubDM_Shell in src/dm/impls/shell/dmshell.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages