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# PCGetInterpolations
Gets interpolation matrices for all levels (except level 0) 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCGetInterpolations(PC pc, PetscInt *num_levels, Mat *interpolations[])
```
Logically Collective


## Input Parameter

- ***pc -*** the precondition context



## Output Parameters

- ***num_levels -*** the number of levels
- ***interpolations -*** the interpolation matrices (size of num_levels-1)





## Developer Note
Why is this here instead of in `PCMG` etc?


## See Also
 `PC`, `PCMG`, `PCMGGetRestriction()`, `PCMGSetInterpolation()`, `PCMGGetInterpolation()`, `PCGetCoarseOperators()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/interface/precon.c.html#PCGetInterpolations">src/ksp/pc/interface/precon.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/hypre/hypre.c.html#PCGetInterpolations_BoomerAMG">PCGetInterpolations_BoomerAMG in src/ksp/pc/impls/hypre/hypre.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/mg/mg.c.html#PCGetInterpolations_MG">PCGetInterpolations_MG in src/ksp/pc/impls/mg/mg.c</A><BR>


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


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