petsc-3.7.7 2017-09-25
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MatMPIBAIJSetPreallocationCSR

 Allocates memory for a sparse parallel matrix in BAIJ format (the default parallel PETSc format).

Synopsis

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

Input Parameters

B - the matrix
bs - the block size
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, parallel

See Also

MatCreate(), MatCreateSeqAIJ(), MatSetValues(), MatMPIBAIJSetPreallocation(), MatCreateAIJ(), MPIAIJ, MatCreateMPIBAIJWithArrays(), MPIBAIJ

Level:developer
Location:src/mat/impls/baij/mpi/mpibaij.c
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