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# MatFDColoringSetUp
Sets up the internal data structures of matrix coloring context for the later use.
## Synopsis
```
#include "petscmat.h"
PetscErrorCode MatFDColoringSetUp(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 `MatGetColoring()` or `DMCreateColoring()`
- ***color -*** the matrix coloring context
## Notes
When the coloring type is `IS_COLORING_LOCAL` the coloring is in the local ordering of the unknowns.
## See Also
`Mat`, `MatFDColoring`, `MatFDColoringCreate()`, `MatFDColoringDestroy()`
## Level
beginner
## Location
src/mat/matfd/fdmatrix.c
## Examples
src/mat/tutorials/ex16.c
src/snes/tutorials/ex14.c
## Implementations
MatFDColoringSetUp_MPIXAIJ in src/mat/impls/aij/mpi/fdmpiaij.c
MatFDColoringSetUp_SeqXAIJ in src/mat/impls/aij/seq/fdaij.c
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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)