:orphan:
# SNESNewtonTRPostCheck
Runs the postcheck routine 
## Synopsis
```
#include "petscsnes.h"   
PetscErrorCode SNESNewtonTRPostCheck(SNES snes, Vec X, Vec Y, Vec W, PetscBool *changed_Y, PetscBool *changed_W)
```
Logically Collective


## Input Parameters

- ***snes -*** the solver
- ***X -*** The last solution
- ***Y -*** The full step direction
- ***W -*** The updated solution, W = X - Y



## Output Parameters

- ***changed_Y -*** indicator if step has been changed
- ***changed_W -*** Indicator if the new candidate solution W has been changed.



## Note
If Y is changed then W is recomputed as X - Y




## See Also
 `SNESNEWTONTR`, `SNESNewtonTRSetPostCheck()`, `SNESNewtonTRGetPostCheck()`, `SNESNewtonTRPreCheck()

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/tr/tr.c.html#SNESNewtonTRPostCheck">src/snes/impls/tr/tr.c</A>


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