# SNESLineSearchBTGetAlpha
Gets the descent parameter, alpha, in the `SNESLINESEARCHBT` variant. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESLineSearchBTGetAlpha(SNESLineSearch linesearch, PetscReal *alpha)
```

## Input Parameter

- ***linesearch -*** linesearch context



## Output Parameter

- ***alpha -*** The descent parameter





## See Also
 `SNESLineSearchGetLambda()`, `SNESLineSearchGetTolerances()` `SNESLINESEARCHBT`, `SNESLineSearchBTGetAlpha()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/linesearch/impls/bt/linesearchbt.c.html#SNESLineSearchBTGetAlpha">src/snes/linesearch/impls/bt/linesearchbt.c</A>


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


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