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 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#

Matrices, Mat, MatGetOwnershipRange(), MatGetOwnershipRanges(), MatGetOwnershipRangesColumn(), PetscLayout

Level#

developer

Location#

src/mat/interface/matrix.c

Examples#

src/ksp/ksp/tutorials/ex27.c
src/mat/tutorials/ex10.c
src/snes/tutorials/ex48.c

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