MatCreateSubMatricesMPI#

Extracts MPI submatrices across a sub communicator of mat (by pairs of IS that may live on subcomms).

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatCreateSubMatricesMPI(Mat mat, PetscInt n, const IS irow[], const IS icol[], MatReuse scall, Mat *submat[])

Collective

Input Parameters#

  • mat - the matrix

  • n - the number of submatrixes to be extracted

  • irow - index set of rows to extract

  • icol - index set of columns to extract

  • scall - either MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX

Output Parameter#

  • submat - the array of submatrices

Note#

This is used by PCGASM

See Also#

Matrices, Mat, PCGASM, MatCreateSubMatrices(), MatCreateSubMatrix(), MatGetRow(), MatGetDiagonal(), MatReuse

Level#

advanced

Location#

src/mat/interface/matrix.c

Implementations#

MatCreateSubMatricesMPI_MPIAdj in src/mat/impls/adj/mpi/mpiadj.c
MatCreateSubMatricesMPI_MPIXAIJ(Mat C, PetscInt ismax, const IS isrow[], const IS iscol[], MatReuse scall, Mat *submat[], PetscErrorCode (*getsubmats_seq)(Mat, PetscInt, const IS[], const IS[], MatReuse, Mat **), PetscErrorCode (*getlocalmats)(Mat, Mat *, Mat *), PetscErrorCode (*setseqmat)(Mat, IS, IS, MatStructure, Mat), PetscErrorCode (*setseqmats) in src/mat/impls/aij/mpi/mpiov.c
MatCreateSubMatricesMPI_MPIAIJ in src/mat/impls/aij/mpi/mpiov.c

Edit on GitLab

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