# MatFDColoringView
Views a finite difference coloring context. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatFDColoringView(MatFDColoring c, PetscViewer viewer)
```
Collective on c


## Input  Parameters

- ***c -*** the coloring context
- ***viewer -*** visualization context





## Notes
The available visualization contexts include

- ***`PETSC_VIEWER_STDOUT_SELF` -*** standard output (default)
- ***`PETSC_VIEWER_STDOUT_WORLD` -*** synchronized standard
output where only the first processor opens
the file.  All other processors send their
data to the first processor to print.
- ***`PETSC_VIEWER_DRAW_WORLD` -*** graphical display of nonzero structure


Since PETSc uses only a small number of basic colors (currently 33), if the coloring
involves more than 33 then some seemingly identical colors are displayed making it look
like an illegal coloring. This is just a graphical artifact.


## See Also
 `Mat`, `MatFDColoring`, `MatFDColoringCreate()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/matfd/fdmatrix.c.html#MatFDColoringView">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.html</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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
