MatMFFDSetFunction

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

Synopsis

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

Logically Collective

Input Parameters

• mat - the matrix-free matrix MATMFFD created via MatCreateSNESMF() or MatCreateMFFD()

• func - the function to use

• funcctx - optional function context passed to function

Calling sequence of func

• 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

Matrices, Mat, MATMFFD, MatCreateSNESMF(), MatMFFDGetH(), MatCreateMFFD(), MatMFFDSetHHistory(), MatMFFDResetHHistory(), SNESSetFunction()

Level

advanced

Location

src/mat/impls/mffd/mffd.c

Examples

src/snes/tutorials/ex22.c

Implementations

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

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