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# MatCompositeGetNumberMat
Returns the number of matrices in the composite matrix. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatCompositeGetNumberMat(Mat mat, PetscInt *nmat)
```
Not Collective


## Input Parameter

- ***mat -*** the composite matrix



## Output Parameter

- ***nmat -*** number of matrices in the composite matrix





## See Also
 [](ch_matrices), `Mat`, `MatCreateComposite()`, `MatCompositeGetMat()`, `MATCOMPOSITE`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/composite/mcomposite.c.html#MatCompositeGetNumberMat">src/mat/impls/composite/mcomposite.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/tutorials/ex9.c.html">src/mat/tutorials/ex9.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/composite/mcomposite.c.html#MatCompositeGetNumberMat_Composite">MatCompositeGetNumberMat_Composite in src/mat/impls/composite/mcomposite.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/composite/mcomposite.c)


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