# VecGetOptionsPrefix
Sets the prefix used for searching for all Vec options in the database. 
## Synopsis
```
#include "petscvec.h"   
PetscErrorCode VecGetOptionsPrefix(Vec v, const char *prefix[])
```
Not Collective


## Input Parameter

- ***v -*** the `Vec` context



## Output Parameter

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





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


## See Also
 [](chapter_vectors), `Vec`, `VecAppendOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/vec/vec/interface/vector.c.html#VecGetOptionsPrefix">src/vec/vec/interface/vector.c</A>


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