petsc-3.7.3 2016-07-24
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# MatFDColoringApply

Given a matrix for which a MatFDColoring context has been created, computes the Jacobian for a function via finite differences.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode  MatFDColoringApply(Mat J,MatFDColoring coloring,Vec x1,void *sctx)

Collective on MatFDColoring

### Input Parameters

| mat | - location to store Jacobian
| coloring | - coloring context created with MatFDColoringCreate()
| x1 | - location at which Jacobian is to be computed
| sctx | - context required by function, if this is being used with the SNES solver then it is SNES object, otherwise it is null

### Options Database Keys

| -mat_fd_type | - "wp" or "ds" (see MATMFFD_WP or MATMFFD_DS)
| -mat_fd_coloring_view | - Activates basic viewing or coloring
| -mat_fd_coloring_view draw | - Activates drawing of coloring
| -mat_fd_coloring_view ::ascii_info | - Activates viewing of coloring info

### See Also

MatFDColoringCreate(), MatFDColoringDestroy(), MatFDColoringView(), MatFDColoringSetFunction()

### Keywords

coloring, Jacobian, finite differences

Level:intermediate
Location: src/mat/matfd/fdmatrix.c
Index of all MatFD routines
Table of Contents for all manual pages
Index of all manual pages