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# DMShellSetCreateMatrix
sets the routine to create a matrix associated with the `DMSHELL`
## Synopsis
```
#include "petscdmshell.h"
PetscErrorCode DMShellSetCreateMatrix(DM dm, PetscErrorCode (*func)(DM, Mat *))
```
Logically Collective
## Input Parameters
- ***dm -*** the `DMSHELL`
- ***func -*** the function to create a matrix
## See Also
`DM`, `DMSHELL`, `DMCreateMatrix()`, `DMShellSetMatrix()`, `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)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)