# TaoGetOptionsPrefix
Gets the prefix used for searching for all Tao options in the database 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoGetOptionsPrefix(Tao tao, const char *p[])
```
Not Collective


## Input Parameters

- ***tao -*** the Tao context



## Output Parameters

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



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




## See Also
 `TaoSetFromOptions()`, `TaoSetOptionsPrefix()`, `TaoAppendOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/interface/taosolver.c.html#TaoGetOptionsPrefix">src/tao/interface/taosolver.c</A>


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


[Index of all Tao routines](index.md)  
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