petsc-3.12.5 2020-03-29
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MatGetCommunicationStructs

 Provides access to the communication structures used in matrix-vector multiplication.

Synopsis

#include "petscmat.h" 
#if defined(PETSC_USE_CTABLE)
PetscErrorCode MatGetCommunicationStructs(Mat A, Vec *lvec, PetscTable *colmap, VecScatter *multScatter)
#else
PetscErrorCode MatGetCommunicationStructs(Mat A, Vec *lvec, PetscInt *colmap[], VecScatter *multScatter)
#endif
Not Collective

Input Parameters

A -The matrix in mpiaij format

Output Parameter

lvec - The local vector holding off-process values from the argument to a matrix-vector product
colmap - A map from global column index to local index into lvec
multScatter - A scatter from the argument of a matrix-vector product to lvec

Level

developer

Location

src/mat/impls/aij/mpi/mpiaij.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages