:orphan:
# MatCompositeAddMat
Add another matrix to a composite matrix.
## Synopsis
```
#include "petscmat.h"
PetscErrorCode MatCompositeAddMat(Mat mat, Mat smat)
```
Collective
## Input Parameters
- ***mat -*** the composite matrix
- ***smat -*** the partial matrix
## See Also
[](ch_matrices), `Mat`, `MatCreateComposite()`, `MatCompositeGetMat()`, `MATCOMPOSITE`
## Level
advanced
## Location
src/mat/impls/composite/mcomposite.c
## Implementations
MatCompositeAddMat_Composite in src/mat/impls/composite/mcomposite.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/composite/mcomposite.c)
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