MatCreateMPISBAIJWithArrays#
creates a MATMPISBAIJ matrix using arrays that contain in standard CSR format for 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_DECIDEto have calculated ifNis given) For square matricesnis almost alwaysm.M - number of global rows (or
PETSC_DETERMINEto have calculated ifmis given)N - number of global columns (or
PETSC_DETERMINEto have calculated ifnis 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.
See Also#
Matrices, Mat, MATMPISBAIJ, MatCreate(), MatCreateSeqAIJ(), MatSetValues(), MatMPIAIJSetPreallocation(), MatMPIAIJSetPreallocationCSR(),
MATMPIAIJ, MatCreateAIJ(), MatCreateMPIAIJWithSplitArrays(), MatMPISBAIJSetPreallocationCSR()
Level#
intermediate
Location#
src/mat/impls/sbaij/mpi/mpisbaij.c
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