MatCreateMPIAIJCRL#
Creates a sparse matrix of type MATMPIAIJCRL.
Synopsis#
PetscErrorCode MatCreateMPIAIJCRL(MPI_Comm comm, PetscInt m, PetscInt n, PetscInt nz, const PetscInt nnz[], PetscInt onz, const PetscInt onnz[], Mat *A)
Collective
Input Parameters#
comm - MPI communicator, set to
PETSC_COMM_SELFm - number of rows
n - number of columns
nz - number of nonzeros per row (same for all rows), for the “diagonal” submatrix
nnz - array containing the number of nonzeros in the various rows (possibly different for each row) or
NULL, for the “diagonal” submatrixonz - number of nonzeros per row (same for all rows), for the “off-diagonal” submatrix
onnz - array containing the number of nonzeros in the various rows (possibly different for each row) or
NULL, for the “off-diagonal” submatrix
Output Parameter#
A - the matrix
Notes#
This type inherits from MATAIJ, but stores some additional information that is used to
allow better vectorization of the matrix-vector product. At the cost of increased storage,
the AIJ formatted matrix can be copied to a format in which pieces of the matrix are stored
in ELLPACK format, allowing the vectorized matrix multiply routine to use stride-1 memory
accesses.
If nnz is given then nz is ignored
See Also#
Matrices, Mat, Sparse Matrix Creation, MATAIJ, MATAIJSELL, MATAIJPERM, MATAIJMKL, MatCreate(), MatCreateMPIAIJPERM(), MatSetValues()
Level#
intermediate
Location#
src/mat/impls/aij/mpi/crl/mcrl.c
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Index of all manual pages