MatGetOwnershipRange#
For matrices that own values by row, excludes MATELEMENTAL
and MATSCALAPACK
, returns the range of matrix rows owned by this MPI process.
Synopsis#
#include "petscmat.h"
PetscErrorCode MatGetOwnershipRange(Mat mat, PetscInt *m, PetscInt *n)
Not Collective
Input Parameter#
mat - the matrix
Output Parameters#
m - the global index of the first local row, use
NULL
to not obtain this valuen - one more than the global index of the last local row, use
NULL
to not obtain this value
Note#
For all matrices it returns the range of matrix rows associated with rows of a vector that would contain the result of a matrix vector product with this matrix. See Matrix Layouts for details on matrix layouts.
See Also#
Matrices, Mat
, MatGetOwnershipRanges()
, MatGetOwnershipRangeColumn()
, MatGetOwnershipRangesColumn()
, PetscSplitOwnership()
, PetscSplitOwnershipBlock()
,
PetscLayout
Level#
beginner
Location#
Examples#
src/tao/pde_constrained/tutorials/hyperbolic.c
src/ts/tutorials/ex41.c
src/snes/tutorials/ex48.c
src/ts/tutorials/ex21.c
src/tao/pde_constrained/tutorials/parabolic.c
src/ts/tutorials/ex44.c
src/tao/tutorials/ex4.c
src/tao/pde_constrained/tutorials/elliptic.c
src/snes/tutorials/ex70.c
src/ts/tutorials/ex17.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages