petsc-3.7.1 2016-05-15
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MatMFFDSetFunction

Sets the function used in applying the matrix free.

Synopsis

#include "petscmat.h"   
PetscErrorCode  MatMFFDSetFunction(Mat mat,PetscErrorCode (*func)(void*,Vec,Vec),void *funcctx)
Logically Collective on Mat Many br

Input Parameters

mat - the matrix free matrix created via MatCreateSNESMF() or MatCreateMFFD() Many br
func - the function to use Many br
funcctx - optional function context passed to function Many br

Calling Sequence of func

    func (void *funcctx, Vec x, Vec f)

funcctx - user provided context Many br
x - input vector Many br
f - computed output function Many br

Many br

Notes

If you use this you MUST call MatAssemblyBegin()/MatAssemblyEnd() on the matrix free Many brmatrix inside your compute Jacobian routine Many br

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

Keywords

SNES, matrix-free, function

See Also

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

Level:advanced
Location:
src/mat/impls/mffd/mffd.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/snes/examples/tutorials/ex22.c.html