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

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