MatCreateSeqAIJPERM#

Creates a sparse matrix of type MATSEQAIJPERM.

Synopsis#

PetscErrorCode MatCreateSeqAIJPERM(MPI_Comm comm, PetscInt m, PetscInt n, PetscInt nz, const PetscInt nnz[], Mat *A)

Collective

Input Parameters#

  • comm - MPI communicator, set to PETSC_COMM_SELF

  • m - number of rows

  • n - number of columns

  • nz - number of nonzeros per row (same for all rows), ignored if nnz is given

  • nnz - array containing the number of nonzeros in the various rows (possibly different for each row) or NULL

Output Parameter#

  • A - the matrix

Notes#

This type inherits from MATSEQAIJ, but calculates some additional permutation information that is used to allow better vectorization of some operations. At the cost of increased storage, the MATSEQAIJ 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.

See Also#

Matrices, Mat, MatCreate(), MatCreateMPIAIJPERM(), MatSetValues()

Level#

intermediate

Location#

src/mat/impls/aij/seq/aijperm/aijperm.c

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