PCFieldSplitRestrictIS#
Restricts the fieldsplit ISs to be within a given IS.
Synopsis#
#include "petscpc.h"
PetscErrorCode PCFieldSplitRestrictIS(PC pc, IS isy)
Input Parameters#
pc - the preconditioner context
is - the index set that defines the indices to which the fieldsplit is to be restricted
Developer Note#
It seems the resulting ISs will not cover the entire space, so
how can they define a convergent preconditioner? Needs explaining.
See Also#
Solving Block Matrices, PCFIELDSPLIT, PCFieldSplitSetFields(), PCFieldSplitSetIS()
Level#
advanced
Location#
Implementations#
PCFieldSplitRestrictIS_FieldSplit in src/ksp/pc/impls/fieldsplit/fieldsplit.c
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