petsc-3.11.4 2019-09-28
MatCreateSeqAIJSELL
Creates a sparse matrix of type SEQAIJSELL. This type inherits from AIJ and is largely identical, but keeps a "shadow" copy of the matrix in SEQSELL format, which is used when this format may be more suitable for a requested operation. Currently, SEQSELL format is used for MatMult, MatMultTranspose, MatMultAdd, MatMultTransposeAdd, and MatSOR operations. Because SEQAIJSELL is a subtype of SEQAIJ, the option "-mat_seqaij_type seqaijsell" can be used to make sequential AIJ matrices default to being instances of MATSEQAIJSELL.
Synopsis
PetscErrorCode MatCreateSeqAIJSELL(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt nz,const PetscInt nnz[],Mat *A)
Collective on MPI_Comm
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)
|
| nnz | - array containing the number of nonzeros in the various rows
(possibly different for each row) or NULL
|
Output Parameter
A -the matrix
Options Database Keys
-mat_aijsell_eager_shadow -Construct shadow matrix upon matrix assembly; default is to take a "lazy" approach, performing this step the first time the matrix is applied
Notes
If nnz is given then nz is ignored
Keywords
matrix, sparse
See Also
MatCreate(), MatCreateMPIAIJSELL(), MatSetValues()
Level
intermediate
Location
src/mat/impls/aij/seq/aijsell/aijsell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages