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 Parameter

• A - the matrix

Output Parameter

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

Notes

See 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 A’s normal operation.

See Also

Matrices, Mat, MatCreateAIJ(), MATAIJ, MATBAIJ, MATSBAIJ

Level

advanced

Location

src/mat/interface/matrix.c

Examples

src/ksp/ksp/tutorials/ex76.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_Htool() in src/mat/impls/htool/htool.cxx
MatGetDiagonalBlock_IS() in src/mat/impls/is/matis.c
MatGetDiagonalBlock_MPIKAIJ() in src/mat/impls/kaij/kaij.c
MatGetDiagonalBlock_Normal() in src/mat/impls/normal/normm.c
MatGetDiagonalBlock_NormalHermitian() in src/mat/impls/normal/normmh.c
MatGetDiagonalBlock_MPISBAIJ() in src/mat/impls/sbaij/mpi/mpisbaij.c
MatGetDiagonalBlock_MPISELL() in src/mat/impls/sell/mpi/mpisell.c

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