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 PC preconditioner context

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

Options Database Key

• -pc_use_amat (true|false) - use the Amat argument to KSPSetOperators() or PCSetOperators() 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 effect.

See Also

KSP: Linear System Solvers, PC, PCGetUseAmat(), PCBJACOBI, PCMG, PCFIELDSPLIT, PCCOMPOSITE, KSPSetOperators(), PCSetOperators()

Level

intermediate

Location

src/ksp/pc/interface/precon.c

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Index of all PC routines
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Index of all manual pages