PCGetUseAmat

Gets 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 PCGetUseAmat(PC pc, PetscBool *flg)

Logically Collective

Input Parameter

• pc - the preconditioner context

Output Parameter

• flg - PETSC_TRUE to use the Amat, PETSC_FALSE to use the Pmat (default is false)

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, PCSetUseAmat(), PCBJACOBI, PGMG, PCFIELDSPLIT, PCCOMPOSITE

Level

intermediate

Location

src/ksp/pc/interface/precon.c

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