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# DMShellSetCreateInterpolation
Set the routine used to create the interpolation operator
## Synopsis
```
#include "petscdmshell.h"
PetscErrorCode DMShellSetCreateInterpolation(DM dm, PetscErrorCode (*interp)(DM, DM, Mat *, Vec *))
```
Logically Collective
Input Parameters
- ***dm -*** the `DMSHELL`
- ***interp -*** the routine to create the interpolation
## See Also
`DM`, `DMSHELL`, `DMShellSetCreateInjection()`, `DMCreateInterpolation()`, `DMShellGetCreateInterpolation()`, `DMShellSetCreateRestriction()`, `DMShellSetContext()`, `DMShellGetContext()`
## Level
advanced
## Location
src/dm/impls/shell/dmshell.c
## Examples
src/ksp/ksp/tutorials/ex65.c
src/ksp/ksp/tutorials/ex73.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/shell/dmshell.c)
[Index of all DM routines](index.md)
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