petsc-3.12.5 2020-03-29
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() or MatCreateMFFD()
|
| func | - the function to use
|
| funcctx | - optional function context passed to function
|
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()/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
MatCreateSNESMF(),MatMFFDGetH(), MatCreateMFFD(), MATMFFD,
MatMFFDSetHHistory(), MatMFFDResetHHistory(), SNESetFunction()
Level
advanced
Location
src/mat/impls/mffd/mffd.c
Examples
src/snes/examples/tutorials/ex22.c.html
Implementations
MatMFFDSetFunction_MFFD(Mat mat,PetscErrorCode (*func) in src/mat/impls/mffd/mffd.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages