petsc-3.4.4 2014-03-13

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

Input Parameters

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

Notes

If you use this you MUST call MatAssemblyBegin()/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.

Keywords

SNES, matrix-free, function

See Also

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

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