# PetscObjectPrependOptionsPrefix
Sets the prefix used for searching for options of for this object in the database. 
## Synopsis
```
#include "petscsys.h"    
PetscErrorCode PetscObjectPrependOptionsPrefix(PetscObject obj, const char prefix[])
```

## Input Parameters

- ***obj -*** any PETSc object, for example a `Vec`, `Mat` or `KSP`.
- ***prefix -*** the prefix string to prepend to option requests of the object.



## 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
 `PetscOptionsCreate()`, `PetscOptionsDestroy()`, `PetscObjectSetOptionsPrefix()`, `PetscObjectAppendOptionsPrefix()`,
`PetscObjectGetOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/objects/prefix.c.html#PetscObjectPrependOptionsPrefix">src/sys/objects/prefix.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/objects/prefix.c)


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