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# SNESLineSearchPreCheck
Prepares the line search for being applied. 
## Synopsis
```
#include "petscsnes.h" 
PetscErrorCode SNESLineSearchPreCheck(SNESLineSearch linesearch, Vec X, Vec Y, PetscBool *changed)
```
Logically Collective


## Input Parameters

- ***linesearch -*** The linesearch instance.
- ***X -*** The current solution
- ***Y -*** The step direction



## Output Parameter

- ***changed -*** Indicator that the precheck routine has changed anything





## Note
This calls any function provided with `SNESLineSearchSetPreCheck()`


## See Also
 `SNESLineSearch`, `SNESGetLineSearch()`, `SNESLineSearchPostCheck()`, `SNESLineSearchSetPreCheck()`, `SNESLineSearchGetPreCheck()`, `SNESLineSearchSetPostCheck()`,
`SNESLineSearchGetPostCheck()``

## Level
advanced

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


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


[Index of all SNES routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)