# MatGetBrowsOfAcols
Returns `IS` that contain rows of B that equal to nonzero columns of local A 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatGetBrowsOfAcols(Mat A, Mat B, MatReuse scall, IS *rowb, IS *colb, Mat *B_seq)
```
Collective


## Input Parameters

- ***A -*** the first matrix in `MATMPIAIJ` format
- ***B -*** the second matrix in `MATMPIAIJ` format
- ***scall -*** either `MAT_INITIAL_MATRIX` or `MAT_REUSE_MATRIX`



## Output Parameters

- ***rowb -*** On input index sets of rows of B to extract (or NULL), modified on output
- ***colb -*** On input index sets of columns of B to extract (or NULL), modified on output
- ***B_seq -*** the sequential matrix generated





## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/mpiaij.c.html#MatGetBrowsOfAcols">src/mat/impls/aij/mpi/mpiaij.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/mpiaij.c.html#MatGetBrowsOfAcols_MPIXAIJ">MatGetBrowsOfAcols_MPIXAIJ in src/mat/impls/aij/mpi/mpiaij.c</A><BR>


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


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