petsc-3.14.6 2021-03-30

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

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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