# PCMGGetRestriction
Gets the function to be used to restrict dual vectors from level l to l-1. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCMGGetRestriction(PC pc, PetscInt l, Mat *mat)
```
Logically Collective


## Input Parameters

- ***pc -*** the multigrid context
- ***l -*** the level (0 is coarsest) to supply [Do not supply 0]



## Output Parameter

- ***mat -*** the restriction matrix





## See Also
 `PCMG`, `PCMGGetInterpolation()`, `PCMGSetRestriction()`, `PCMGGetRScale()`, `PCMGGetInjection()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/mg/mgfunc.c.html#PCMGGetRestriction">src/ksp/pc/impls/mg/mgfunc.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/mg/mgfunc.c)


[Index of all PC routines](index.md)  
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