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


## Input Parameters

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



## Output Parameter

- ***mat -*** the restriction matrix (may be NULL if no injection is available).





## See Also
 `PCMG`, `PCMGSetInjection()`, `PCMGetGetRestriction()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/mg/mgfunc.c.html#PCMGGetInjection">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)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
