SNESGetUseMatrixFree#

indicates if the SNES uses matrix-free finite difference matrix vector products to apply the Jacobian.

Synopsis#

#include "petscsnes.h"  
PetscErrorCode SNESGetUseMatrixFree(SNES snes, PetscBool *mf_operator, PetscBool *mf)

Not Collective, but the resulting flags will be the same on all MPI ranks

Input Parameter#

snes - SNES context

Output Parameters#

mf_operator - use matrix-free only for the Amat used by SNESSetJacobian(), this means the user provided Pmat will continue to be used
mf - use matrix-free for both the Amat and Pmat used by SNESSetJacobian(), both the Amat and Pmat set in SNESSetJacobian() will be ignored

See Also#

SNES: Nonlinear Solvers, SNES, SNESSetUseMatrixFree(), MatCreateSNESMF()

Level#

intermediate

Location#

src/snes/interface/snes.c

Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages