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# MatFindZeroRows
Locate all rows that are completely zero in the matrix 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatFindZeroRows(Mat mat, IS *zerorows)
```

## Input Parameter

- ***A  -*** the matrix



## Output Parameter

- ***zerorows -*** the rows that are completely zero





## Note
`zerorows` is set to `NULL` if no rows are zero.


## See Also
 [](ch_matrices), `Mat`, `MatFindNonzeroRows()`

## Level
intermediate

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


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