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# SNESFASGetRestriction
Gets the matrix used to calculate the restriction from l to the l-1th level 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESFASGetRestriction(SNES snes, PetscInt level, Mat *mat)
```

## Input Parameters

- ***snes      -*** the `SNESFAS` nonlinear multigrid context
- ***level     -*** the level (0 is coarsest) to supply [do not supply 0]



## Output Parameter

- ***mat       -*** the interpolation operator





## See Also
 `SNESFAS`, `SNESFASSetRestriction()`, `SNESFASGetInjection()`, `SNESFASGetInterpolation()`, `SNESFASGetRScale()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/impls/fas/fasfunc.c.html#SNESFASGetRestriction">src/snes/impls/fas/fasfunc.c</A>


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


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