petsc-3.9.4 2018-09-11
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MatGetDiagonalBlock

 Returns the part of the matrix associated with the on-process coupling

Synopsis

#include "petscmat.h" 
PetscErrorCode MatGetDiagonalBlock(Mat A,Mat *a)
Not Collective

Input Parameters

A -the matrix

Output Parameters

a -the diagonal part (which is a SEQUENTIAL matrix)

Notes: see the manual page for MatCreateAIJ() for more information on the "diagonal part" of the matrix. Use caution, as the reference count on the returned matrix is not incremented and it is used as part of the containing MPI Mat's normal operation.

Level

advanced

Location

src/mat/interface/matrix.c

Implementations

MatGetDiagonalBlock_MPIAIJ in src/mat/impls/aij/mpi/mpiaijpc.c
MatGetDiagonalBlock_MPIBAIJ in src/mat/impls/baij/mpi/mpibaij.c
MatGetDiagonalBlock_MPIDense in src/mat/impls/dense/mpi/mpidense.c
MatGetDiagonalBlock_MPISBAIJ in src/mat/impls/sbaij/mpi/mpisbaij.c
MatGetDiagonalBlock_MPISELL in src/mat/impls/sell/mpi/mpisell.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages