:orphan:
# MatGetOwnershipRangeColumn
Returns the range of matrix columns associated with rows of a vector one multiplies this matrix by that are owned by this processor. (The columns of the "diagonal block" for most sparse matrix formats). See [Matrix Layouts](sec_matlayout) for details on matrix layouts. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatGetOwnershipRangeColumn(Mat mat, PetscInt *m, PetscInt *n)
```
Not Collective, unless matrix has not been allocated, then collective


## Input Parameter

- ***mat -*** the matrix



## Output Parameters

- ***m -*** the global index of the first local column, use `NULL` to not obtain this value
- ***n -*** one more than the global index of the last local column, use `NULL` to not obtain this value





## See Also
 [](ch_matrices), `Mat`, `MatGetOwnershipRange()`, `MatGetOwnershipRanges()`, `MatGetOwnershipRangesColumn()`, `PetscLayout`

## Level
developer

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex27.c.html">src/ksp/ksp/tutorials/ex27.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/tutorials/ex10.c.html">src/mat/tutorials/ex10.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex48.c.html">src/snes/tutorials/ex48.c</A><BR>


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