PCFieldSplitSetIS#

Sets the exact elements for a split in a PCFIELDSPLIT

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCFieldSplitSetIS(PC pc, const char splitname[], IS is)

Logically Collective

Input Parameters#

  • pc - the preconditioner context

  • splitname - name of this split, if NULL the number of the split is used

  • is - the index set that defines the elements in this split

Notes#

Use PCFieldSplitSetFields(), for splits defined by strided types.

This function is called once per split (it creates a new split each time). Solve options for this split will be available under the prefix -fieldsplit_SPLITNAME_.

See Also#

Solving Block Matrices, PC, PCFieldSplitGetSubKSP(), PCFIELDSPLIT, PCFieldSplitSetBlockSize()

Level#

intermediate

Location#

src/ksp/pc/impls/fieldsplit/fieldsplit.c

Examples#

src/ksp/ksp/tutorials/ex81.c
src/snes/tutorials/ex28.c
src/snes/tutorials/ex70.c

Implementations#

PCFieldSplitSetIS_FieldSplit in src/ksp/pc/impls/fieldsplit/fieldsplit.c

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