# TaoShellSetSolve
Sets routine to apply as solver 
## Synopsis
```
#include "petsctao.h" 
PetscErrorCode TaoShellSetSolve(Tao tao, PetscErrorCode (*solve)(Tao))
```
Logically Collective on Tao


## Input Parameters

- ***tao -*** the nonlinear solver context
- ***solve -*** the application-provided solver routine



## Calling sequence of solve
```none
   PetscErrorCode solve (Tao tao)
```



- ***tao -*** the optimizer, get the application context with TaoShellGetContext()



## Notes
the function MUST return an error code of 0 on success and nonzero on failure.




## See Also
 `TAOSHELL`, `TaoShellSetContext()`, `TaoShellGetContext()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/unconstrained/impls/cg/taoshell.c.html#TaoShellSetSolve">src/tao/unconstrained/impls/cg/taoshell.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/tao/constrained/tutorials/tomographyADMM.c.html">src/tao/constrained/tutorials/tomographyADMM.c.html</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/tao/unconstrained/impls/cg/taoshell.c)


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