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# DMShellSetCreateRestriction
Set the routine used to create the restriction operator
## Synopsis
```
#include "petscdmshell.h"
PetscErrorCode DMShellSetCreateRestriction(DM dm, PetscErrorCode (*restriction)(DM, DM, Mat *))
```
Logically Collective
Input Parameters
- ***dm -*** the `DMSHELL`
- ***striction-*** the routine to create the restriction
## See Also
`DM`, `DMSHELL`, `DMShellSetCreateInjection()`, `DMCreateInterpolation()`, `DMShellGetCreateRestriction()`, `DMShellSetContext()`, `DMShellGetContext()`
## Level
advanced
## Location
src/dm/impls/shell/dmshell.c
## Examples
src/ksp/ksp/tutorials/ex65.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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