PCSetUseAmat#
Sets a flag to indicate that when the preconditioner needs to apply (part of) the operator during the preconditioning process it applies the Amat provided to TSSetRHSJacobian(), TSSetIJacobian(), SNESSetJacobian(), KSPSetOperators() or PCSetOperators() not the Pmat.
Synopsis#
#include "petscksp.h"
PetscErrorCode PCSetUseAmat(PC pc, PetscBool flg)
Logically Collective
Input Parameters#
pc - the preconditioner context
flg -
PETSC_TRUEto use the Amat,PETSC_FALSEto use the Pmat (default is false)
Options Database Key#
-pc_use_amat <true,false> - use the amat argument to
KSPSetOperators()orPCSetOperators()to apply the operator
Note#
For the common case in which the linear system matrix and the matrix used to construct the preconditioner are identical, this routine has no affect.
See Also#
KSP: Linear System Solvers, PC, PCGetUseAmat(), PCBJACOBI, PCMG, PCFIELDSPLIT, PCCOMPOSITE,
KSPSetOperators(), PCSetOperators()
Level#
intermediate
Location#
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages