# PCMGSetAdaptInterpolation
Adapt the interpolator based upon a vector space which should be accurately captured by the next coarser mesh, and thus accurately interpolated. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCMGSetAdaptInterpolation(PC pc, PetscBool adapt)
```
Logically Collective


## Input Parameters

- ***pc    -*** the multigrid context
- ***adapt -*** flag for adaptation of the interpolator



## Options Database Keys

- ***-pc_mg_adapt_interp                     -*** Turn on adaptation
- ***-pc_mg_adapt_interp_n <int>             -*** The number of modes to use, should be divisible by dimension
- ***-pc_mg_adapt_interp_coarse_space <type> -*** The type of coarse space: polynomial, harmonic, eigenvector, generalized_eigenvector





## See Also
 `PCMG`, `PCMGGetAdaptInterpolation()`, `PCMGSetGalerkin()`, `PCMGGetAdaptCoarseSpaceType()`, `PCMGSetAdaptCoarseSpaceType()`

## Level
intermediate

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

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/mg/mg.c.html#PCMGSetAdaptInterpolation_MG">PCMGSetAdaptInterpolation_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/impls/mg/mg.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)  
