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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
src/ksp/pc/interface/precon.c
## Implementations
PCGetInterpolations_BoomerAMG in src/ksp/pc/impls/hypre/hypre.c
PCGetInterpolations_MG in src/ksp/pc/impls/mg/mg.c
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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)