:orphan:
# DMShellSetMatrix
sets a template matrix associated with the `DMSHELL`
## Synopsis
```
#include "petscdmshell.h"
PetscErrorCode DMShellSetMatrix(DM dm, Mat J)
```
Collective
## Input Parameters
- ***dm -*** `DMSHELL`
- ***J -*** template matrix
## Developer Note
To avoid circular references, if `J` is already associated to the same `DM`, then `MatDuplicate`(`SHARE_NONZERO_PATTERN`) is called, followed by removing the `DM` reference from the private template.
## See Also
`DM`, `DMSHELL`, `DMCreateMatrix()`, `DMShellSetCreateMatrix()`, `DMShellSetContext()`, `DMShellGetContext()`
## Level
advanced
## Location
src/dm/impls/shell/dmshell.c
## Examples
src/snes/tutorials/ex73f90t.F90
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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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