:orphan:
# MatProductClear
Clears from the matrix any internal data structures related to the computation of the values of the matrix from matrix-matrix product operations 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatProductClear(Mat mat)
```
Collective


## Input Parameter

- ***mat -*** the matrix whose values are to be computed via a matrix-matrix product operation



## Options Database Key

- ***-mat_product_clear -*** Clear intermediate data structures after `MatProductNumeric()` has been called





## Notes
This function should be called to remove any intermediate data used to compute the matrix to free up memory.

After having called this function, matrix-matrix product operations can no longer be used on `mat`


## See Also
 [](ch_matrices), `MatProduct`, `Mat`, `MatProductCreate()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/interface/matproduct.c.html#MatProductClear">src/mat/interface/matproduct.c</A>


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


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