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_TRUE to use the Amat, PETSC_FALSE to use the Pmat (default is false)

Options Database Key#

  • -pc_use_amat <true,false> - use the amat 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 is does nothing.

See Also#

PC, PCGetUseAmat(), PCBJACOBI, PGMG, PCFIELDSPLIT, PCCOMPOSITE

Level#

intermediate

Location#

src/ksp/pc/interface/precon.c

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