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# MatFDColoringCreate
Creates a matrix coloring context for finite difference computation of Jacobians. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatFDColoringCreate(Mat mat, ISColoring iscoloring, MatFDColoring *color)
```
Collective


## Input Parameters

- ***mat -*** the matrix containing the nonzero structure of the Jacobian
- ***iscoloring -*** the coloring of the matrix; usually obtained with `MatColoringCreate()` or `DMCreateColoring()`



## Output Parameter

- ***color -*** the new coloring context





## See Also
 `Mat`, `MatFDColoring`, `MatFDColoringDestroy()`, `SNESComputeJacobianDefaultColor()`, `ISColoringCreate()`,
`MatFDColoringSetFunction()`, `MatFDColoringSetFromOptions()`, `MatFDColoringApply()`,
`MatFDColoringView()`, `MatFDColoringSetParameters()`, `MatColoringCreate()`, `DMCreateColoring()`, `MatFDColoringSetValues()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/matfd/fdmatrix.c.html#MatFDColoringCreate">src/mat/matfd/fdmatrix.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/tutorials/ex16.c.html">src/mat/tutorials/ex16.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex14.c.html">src/snes/tutorials/ex14.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/unconstrained/tutorials/minsurf2.c.html">src/tao/unconstrained/tutorials/minsurf2.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/fdmpiaij.c.html#MatFDColoringCreate_MPIXAIJ">MatFDColoringCreate_MPIXAIJ in src/mat/impls/aij/mpi/fdmpiaij.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/seq/fdaij.c.html#MatFDColoringCreate_SeqXAIJ">MatFDColoringCreate_SeqXAIJ in src/mat/impls/aij/seq/fdaij.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/matfd/fdmatrix.c)


[Index of all MatFD routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)