petsc-3.7.7 2017-09-25
   
MatSeqBAIJSetPreallocationCSR
Allocates memory for a sparse sequential matrix in AIJ format (the default sequential PETSc format). 
Synopsis
#include "petscmat.h"  
PetscErrorCode  MatSeqBAIJSetPreallocationCSR(Mat B,PetscInt bs,const PetscInt i[],const PetscInt j[], const PetscScalar v[])
Collective on MPI_Comm
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.
Keywords
 matrix, aij, compressed row, sparse
See Also
 MatCreate(), MatCreateSeqBAIJ(), MatSetValues(), MatSeqBAIJSetPreallocation(), MATSEQBAIJ
Level:developer
Location:src/mat/impls/baij/seq/baij.c
Index of all Mat routines
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