petsc-3.12.5 2020-03-29

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(), KSPSetOperator() or PCSetOperator() not the Pmat.

Synopsis

#include "petscksp.h" 
PetscErrorCode  PCSetUseAmat(PC pc,PetscBool flg)

Logically Collective on PC

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> - Notes: 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.

Level

intermediate

Location