:orphan:
# SNESLineSearchSetUp
Prepares the line search for being applied by allocating any required vectors. 
## Synopsis
```
#include "petscsnes.h" 
PetscErrorCode SNESLineSearchSetUp(SNESLineSearch linesearch)
```
Collective


## Input Parameter

- ***linesearch -*** The `SNESLineSearch` instance.





## Note
For most cases, this needn't be called by users or outside of `SNESLineSearchApply()`.
The only current case where this is called outside of this is for the VI
solvers, which modify the solution and work vectors before the first call
of `SNESLineSearchApply()`, requiring the `SNESLineSearch` work vectors to be
allocated upfront.


## See Also
 `SNESLineSearch`, `SNESGetLineSearch()`, `SNESLineSearchReset()`

## Level
advanced

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