PETSc version 3.15.5
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