petsc-3.7.5 2017-01-01
MatSeqSBAIJSetPreallocationCSR
Allocates memory for a sparse sequential matrix in symmetric block AIJ format.
Synopsis
#include "petscmat.h"
PetscErrorCode MatSeqSBAIJSetPreallocationCSR(Mat B,PetscInt bs,const PetscInt i[],const PetscInt j[], const PetscScalar v[])
Input Parameters
| B | - the matrix
|
| bs | - size of block, the blocks are ALWAYS square.
|
| i | - the indices into j for the start of each local row (starts with zero)
|
| j | - the column indices for each local row (starts with zero) these must be sorted for each row
|
| v | - optional values in the matrix
|
Notes
The order of the entries in values is specified by the MatOption MAT_ROW_ORIENTED. For example, C programs
may want to use the default MAT_ROW_ORIENTED=PETSC_TRUE and use an array v[nnz][bs][bs] where the second index is
over rows within a block and the last index is over columns within a block row. Fortran programs will likely set
MAT_ROW_ORIENTED=PETSC_FALSE and use a Fortran array v(bs,bs,nnz) in which the first index is over rows within a
block column and the second index is over columns within a block.
Keywords
matrix, block, aij, compressed row, sparse
See Also
MatCreate(), MatCreateSeqSBAIJ(), MatSetValuesBlocked(), MatSeqSBAIJSetPreallocation(), MATSEQSBAIJ
Level:developer
Location:src/mat/impls/sbaij/seq/sbaij.c
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