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# MatIsLinear
Check if a shell matrix `A` is a linear operator. 
## Synopsis
```
#include "petscmat.h"  
PetscErrorCode MatIsLinear(Mat A, PetscInt n, PetscBool *flg)
```
Collective


## Input Parameters

- ***A -*** the shell matrix
- ***n -*** number of random vectors to be tested



## Output Parameter

- ***flg -*** `PETSC_TRUE` if the shell matrix is linear; `PETSC_FALSE` otherwise.





## See Also
 `Mat`, `MatMatMultAddEqual()`, `MatMultEqual()`, `MatMultAddEqual()`, `MatMultTransposeEqual()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/utils/multequal.c.html#MatIsLinear">src/mat/utils/multequal.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex14f.F90.html">src/ksp/ksp/tutorials/ex14f.F90</A><BR>


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


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