# SNESSetOptionsPrefix
Sets the prefix used for searching for all `SNES` options in the database. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESSetOptionsPrefix(SNES snes, const char prefix[])
```
Logically Collective on snes


## Input Parameters

- ***snes -*** the `SNES` 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
 `SNES`, `SNESSetFromOptions()`, `SNESAppendOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/interface/snes.c.html#SNESSetOptionsPrefix">src/snes/interface/snes.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex1.c.html">src/snes/tutorials/ex1.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/utils/dmplexlandau/tutorials/ex1f90.F90.html">src/ts/utils/dmplexlandau/tutorials/ex1f90.F90.html</A><BR>


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


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