petsc-master 2019-11-11
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MatSeqBAIJSetPreallocationCSR

Creates a sparse parallel matrix in BAIJ format using the given nonzero structure and (optional) numerical values

Synopsis

#include "petscmat.h"  
PetscErrorCode  MatSeqBAIJSetPreallocationCSR(Mat B,PetscInt bs,const PetscInt i[],const PetscInt j[], const PetscScalar v[])
Collective

Input Parameters

B - the matrix
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.

Though this routine has Preallocation() in the name it also sets the exact nonzero locations of the matrix entries and usually the numerical values as well

See Also

MatCreate(), MatCreateSeqBAIJ(), MatSetValues(), MatSeqBAIJSetPreallocation(), MATSEQBAIJ

Level

advanced

Location

src/mat/impls/baij/seq/baij.c

Implementations

MatSeqBAIJSetPreallocationCSR_SeqBAIJ in src/mat/impls/baij/seq/baij.c

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