PETSc version 3.15.4
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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