petsc-master 2020-11-30
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MatMPIAIJGetSeqAIJ

Returns the local piece of this distributed matrix

Synopsis

#include "petscmat.h" 
PetscErrorCode MatMPIAIJGetSeqAIJ(Mat A,Mat *Ad,Mat *Ao,const PetscInt *colmap[])
Not collective

Input Parameter

A - The MPIAIJ matrix

Output Parameters

Ad - The local diagonal block as a SeqAIJ matrix
Ao - The local off-diagonal block as a SeqAIJ matrix
colmap - An array mapping local column numbers of Ao to global column numbers of the parallel matrix

Note: The rows in Ad and Ao are in [0, Nr), where Nr is the number of local rows on this process. The columns in Ad are in [0, Nc) where Nc is the number of local columns. The columns are Ao are in [0, Nco), where Nco is the number of nonzero columns in the local off-diagonal piece of the matrix A. The array colmap maps these local column numbers to global column numbers in the original matrix.

See Also

MatMPIAIJGetLocalMat(), MatMPIAIJGetLocalMatCondensed(), MatCreateAIJ(), MATMPIAIJ, MATSEQAIJ

Level

intermediate

Location

src/mat/impls/aij/mpi/mpiaij.c

Examples

src/mat/tutorials/ex8.c.html

Index of all Mat routines
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Index of all manual pages