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 to select

  • fields - The field numbers of the selected fields

Output Parameters#

  • is - The global indices for all the degrees of freedom in the new sub DM

  • 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#

DM Basics, DM, DMCreateFieldIS(), DMCreateFieldDecomposition(), DMAddField(), DMCreateSuperDM(), DM, IS, DMPlexSetMigrationSF(), DMDestroy(), DMView(), DMCreateInterpolation(), DMCreateColoring(), DMCreateMatrix(), DMCreateMassMatrix(), DMCreateFieldIS()

Level#

intermediate

Location#

src/dm/interface/dm.c

Examples#

src/snes/tutorials/ex56.c
src/snes/tutorials/ex63.c
src/snes/tutorials/ex77.c
src/ts/tutorials/ex77.c

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

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