petsc-3.14.6 2021-03-30

MatCreateMPISBAIJWithArrays

creates a MPI SBAIJ matrix using arrays that contain in standard CSR format the local rows.

Synopsis

#include "petscmat.h" 
PetscErrorCode  MatCreateMPISBAIJWithArrays(MPI_Comm comm,PetscInt bs,PetscInt m,PetscInt n,PetscInt M,PetscInt N,const PetscInt i[],const PetscInt j[],const PetscScalar a[],Mat *mat)

Collective

Input Parameters

	comm	- MPI communicator
	bs	- the block size, only a block size of 1 is supported
	m	- number of local rows (Cannot be PETSC_DECIDE)
	n	- This value should be the same as the local size used in creating the x vector for the matrix-vector product y = Ax. (or PETSC_DECIDE to have calculated if N is given) For square matrices n is almost always m.
	M	- number of global rows (or PETSC_DETERMINE to have calculated if m is given)
	N	- number of global columns (or PETSC_DETERMINE to have calculated if n is given)
	i	- row indices; that is i[0] = 0, i[row] = i[row-1] + number of block elements in that row block row of the matrix
	j	- column indices
	a	- matrix values

Output Parameter

mat

- the matrix

Notes

The i, j, and a arrays ARE copied by this routine into the internal format used by PETSc; thus you CANNOT change the matrix entries by changing the values of a[] after you have called this routine. Use MatCreateMPIAIJWithSplitArrays() to avoid needing to copy the arrays.

The i and j indices are 0 based, and i indices are indices corresponding to the local j array.

Level

intermediate

Location

src/mat/impls/sbaij/mpi/mpisbaij.c
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