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# SNESFASSetInjection
Sets the function to be used to inject the solution from level l to l-1. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESFASSetInjection(SNES snes, PetscInt level, Mat mat)
```

## Input Parameters
+  snes  - the `SNESFAS` nonlinear multigrid context

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


- ***level -*** the level (0 is coarsest) to supply [Do not supply 0]





## Note
If you do not set this, the restriction and rscale is used to
project the solution instead.


## See Also
 `SNESFAS`, `SNESFASSetInterpolation()`, `SNESFASSetRestriction()`

## Level
advanced

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