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# SNESLineSearchGetVIFunctions
Sets VI-specific functions for line search computation. 
## Synopsis
```
#include "petscsnes.h" 
PetscErrorCode SNESLineSearchGetVIFunctions(SNESLineSearch linesearch, SNESLineSearchVIProjectFunc *projectfunc, SNESLineSearchVINormFunc *normfunc)
```
Not Collective


## Input Parameter

- ***linesearch -*** the line search context, obtain with `SNESGetLineSearch()`



## Output Parameters

- ***projectfunc -*** function for projecting the function to the bounds
- ***normfunc -*** function for computing the norm of an active set





## See Also
 `SNESLineSearch`, `SNESLineSearchSetVIFunctions()`, `SNESLineSearchGetPostCheck()`, `SNESLineSearchGetPreCheck()`

## Level
advanced

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


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