# 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 on mat


## 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
 `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>


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


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