petsc-3.14.5 2021-03-03
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# MatCreateMPIAIJWithSeqAIJ

creates a MPIAIJ matrix using SeqAIJ matrices that contain the "diagonal" and "off-diagonal" part of the matrix in CSR format.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatCreateMPIAIJWithSeqAIJ(MPI_Comm comm,Mat A,Mat B,const PetscInt garray[],Mat *mat)

Collective

### Input Parameters

| comm | - MPI communicator
| A | - "diagonal" portion of matrix
| B | - "off-diagonal" portion of matrix, may have empty columns, will be destroyed by this routine
| garray | - global index of B columns

### Output Parameter

| mat | - the matrix, with input A as its local diagonal matrix

### Notes

See MatCreateAIJ() for the definition of "diagonal" and "off-diagonal" portion of the matrix. A becomes part of output mat, B is destroyed by this routine. The user cannot use A and B anymore.

### See Also

MatCreateMPIAIJWithSplitArrays()

### Level

advanced

### 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