# TaoAppendOptionsPrefix
Appends to the prefix used for searching for all Tao options in the database. 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoAppendOptionsPrefix(Tao tao, const char p[])
```
Logically Collective on tao


## Input Parameters

- ***tao -*** the Tao solver context
- ***prefix -*** the prefix string to prepend to all Tao option requests



## 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
 `TaoSetFromOptions()`, `TaoSetOptionsPrefix()`, `TaoGetOptionsPrefix()`

## Level
advanced

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