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