# 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
On the fortran side, the user should pass in a string 'prefix' of
sufficient length to hold the prefix.




## See Also
 `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>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/interface/matrix.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)  
