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# MatMFFDSetOptionsPrefix
Sets the prefix used for searching for all MATMFFD` options in the database. 
## Synopsis
```
#include "petscmat.h"   
PetscErrorCode MatMFFDSetOptionsPrefix(Mat mat, const char prefix[])
```
Collective


## Input Parameters

- ***A -*** the `MATMFFD` context
- ***prefix -*** the prefix to prepend to all option names



## Note
A hyphen (-) must NOT be given at the beginning of the prefix name.
The first character of all runtime options is AUTOMATICALLY the hyphen.




## See Also
 [](ch_matrices), `Mat`, `MATMFFD`, `MatSetFromOptions()`, `MatCreateSNESMF()`, `MatCreateMFFD()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/mffd/mffd.c.html#MatMFFDSetOptionsPrefix">src/mat/impls/mffd/mffd.c</A>


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


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