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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Index of all manual pages