PCFieldSplitSetOffDiagUseAmat#

set flag indicating whether to extract off-diagonal blocks from Amat (rather than Pmat) to build the sub-matrices associated with each split. Where KSPSetOperators(ksp,Amat,Pmat) was used to supply the operators.

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCFieldSplitSetOffDiagUseAmat(PC pc, PetscBool flg)

Logically Collective

Input Parameters#

  • pc - the preconditioner object

  • flg - boolean flag indicating whether or not to use Amat to extract the off-diagonal blocks from

Options Database Key#

  • -pc_fieldsplit_off_diag_use_amat - use the Amat to extract the off-diagonal blocks

See Also#

Solving Block Matrices, PC, PCSetOperators(), KSPSetOperators(), PCFieldSplitGetOffDiagUseAmat(), PCFieldSplitSetDiagUseAmat(), PCFIELDSPLIT

Level#

intermediate

Location#

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

Index of all PC routines
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Index of all manual pages