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# DMInterpolationEvaluate
Using the input from dm and x, calculates interpolated field values at the interpolation points. 
## Synopsis
```
#include "petscdmplex.h" 
#include "petscsnes.h"   
PetscErrorCode DMInterpolationEvaluate(DMInterpolationInfo ctx, DM dm, Vec x, Vec v)
```

## Input Parameters

- ***ctx -*** The `DMInterpolationInfo` context
- ***dm  -*** The `DM`
- ***x   -*** The local vector containing the field to be interpolated



## Output Parameter

- ***v   -*** The vector containing the interpolated values





## Note
A suitable `v` can be obtained using `DMInterpolationGetVector()`.


## See Also
 `DMInterpolationInfo`, `DMInterpolationGetVector()`, `DMInterpolationAddPoints()`, `DMInterpolationCreate()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/utils/dmplexsnes.c.html#DMInterpolationEvaluate">src/snes/utils/dmplexsnes.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex63.c.html">src/snes/tutorials/ex63.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex77.c.html">src/ts/tutorials/ex77.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/snes/utils/dmplexsnes.c)


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