MatMPIAIJGetSeqAIJ

Returns the local pieces 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 MATMPIAIJ matrix

Output Parameters

• Ad - The local diagonal block as a MATSEQAIJ matrix

• Ao - The local off-diagonal block as a MATSEQAIJ 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.

Fortran Notes

MatMPIAIJGetSeqAIJ() Fortran binding is deprecated (since PETSc 3.19), use MatMPIAIJGetSeqAIJF90()

See Also

Matrices, Mat, MATMPIAIJ, MatMPIAIJGetSeqAIJF90(), MatMPIAIJRestoreSeqAIJF90(), MatMPIAIJGetLocalMat(), MatMPIAIJGetLocalMatCondensed(), MatCreateAIJ(), MATSEQAIJ

Level

intermediate

Location

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

Examples

src/mat/tutorials/ex8.c
src/ksp/ksp/tutorials/ex19.c

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