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# DMShellSetCoarsen
Set the routine used to coarsen the `DMSHELL` 
## Synopsis
```
#include "petscdmshell.h"  
PetscErrorCode DMShellSetCoarsen(DM dm, PetscErrorCode (*coarsen)(DM, MPI_Comm, DM *))
```
Logically Collective

Input Parameters

- ***dm -*** the `DMSHELL`
- ***coarsen -*** the routine that coarsens the `DM`





## See Also
 `DM`, `DMSHELL`, `DMShellSetRefine()`, `DMCoarsen()`, `DMShellGetCoarsen()`, `DMShellSetContext()`, `DMShellGetContext()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/shell/dmshell.c.html#DMShellSetCoarsen">src/dm/impls/shell/dmshell.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex65.c.html">src/ksp/ksp/tutorials/ex65.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex73.c.html">src/ksp/ksp/tutorials/ex73.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/shell/dmshell.c)


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