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# MatGetOptionsPrefix
Gets the prefix used for searching for all matrix options in the database. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatGetOptionsPrefix(Mat A, const char *prefix[])
```
Not Collective


## Input Parameter

- ***A -*** the matrix



## Output Parameter

- ***prefix -*** pointer to the prefix string used





## Fortran Note
The user should pass in a string `prefix` of
sufficient length to hold the prefix.


## See Also
 [](ch_matrices), `Mat`, `MatAppendOptionsPrefix()`, `MatSetOptionsPrefix()`, `MatAppendOptionsPrefixFactor()`, `MatSetOptionsPrefixFactor()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/interface/matrix.c.html#MatGetOptionsPrefix">src/mat/interface/matrix.c</A>


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