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# MatGetOption
Gets a parameter option that has been set for a matrix. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatGetOption(Mat mat, MatOption op, PetscBool *flg)
```
Logically Collective


## Input Parameters

- ***mat -*** the matrix
- ***option -*** the option, this only responds to certain options, check the code for which ones



## Output Parameter

- ***flg -*** turn the option on (`PETSC_TRUE`) or off (`PETSC_FALSE`)





## Notes
Can only be called after `MatSetSizes()` and `MatSetType()` have been set.

Certain option values may be unknown, for those use the routines `MatIsSymmetric()`, `MatIsHermitian()`, `MatIsStructurallySymmetric()`, or
`MatIsSymmetricKnown()`, `MatIsHermitianKnown()`, `MatIsStructurallySymmetricKnown()`


## See Also
 [](ch_matrices), `Mat`, `MatOption`, `MatSetOption()`, `MatIsSymmetric()`, `MatIsHermitian()`, `MatIsStructurallySymmetric()`,
`MatIsSymmetricKnown()`, `MatIsHermitianKnown()`, `MatIsStructurallySymmetricKnown()`

## Level
intermediate

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


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


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