petsc-3.14.5 2021-03-03
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# MatGetOwnershipRangeColumn

Returns the range of matrix columns associated with rows of a vector one multiplies by that owned by this processor. (The columns of the "diagonal block")

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatGetOwnershipRangeColumn(Mat mat,PetscInt *m,PetscInt *n)

Not Collective, unless matrix has not been allocated, then collective on Mat

### Input Parameters

| mat | - the matrix

### Output Parameters

| m | - the global index of the first local column
| n | - one more than the global index of the last local column

### Notes

both output parameters can be NULL on input.

### See Also

MatGetOwnershipRange(), MatGetOwnershipRanges(), MatGetOwnershipRangesColumn()

### Level

developer

### Location

src/mat/interface/matrix.c

### Examples

src/mat/tutorials/ex10.c.html
src/snes/tutorials/ex48.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages