MatMFFDSetFunction#

Sets the function used in applying the matrix free MATMFFD matrix.

Synopsis#

#include "petscmat.h"   
PetscErrorCode MatMFFDSetFunction(Mat mat, PetscErrorCode (*func)(void *, Vec, Vec), void *funcctx)

Logically Collective

Input Parameters#

Calling Sequence of func#

func (void *funcctx, Vec x, Vec f)
  • funcctx - user provided context

  • x - input vector

  • f - computed output function

Notes#

If you use this you MUST call MatAssemblyBegin() and MatAssemblyEnd() on the matrix free matrix inside your compute Jacobian routine

If this is not set then it will use the function set with SNESSetFunction() if MatCreateSNESMF() was used.

See Also#

MATMFFD, MatCreateSNESMF(), MatMFFDGetH(), MatCreateMFFD(), MATMFFD, MatMFFDSetHHistory(), MatMFFDResetHHistory(), SNESetFunction()

Level#

advanced

Location#

src/mat/impls/mffd/mffd.c

Examples#

src/snes/tutorials/ex22.c.html

Implementations#

MatMFFDSetFunction_MFFD(Mat mat, PetscErrorCode (*func) in src/mat/impls/mffd/mffd.c


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