MatMPIAIJSetPreallocationCSR

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

Synopsis

#include "petscmat.h" 
PetscErrorCode PETSCMAT_DLLEXPORT MatMPIAIJSetPreallocationCSR(Mat B,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: this actually copies the values from i[], j[], and a[] to put them into PETSc's internal storage format. Thus changing the values in a[] after this call will not effect the matrix values.

Keywords

matrix, aij, compressed row, sparse, parallel

See Also

MatCreate(), MatCreateSeqAIJ(), MatSetValues(), MatMPIAIJSetPreallocation(), MatCreateMPIAIJ(), MPIAIJ,
MatCreateSeqAIJWithArrays(), MatCreateMPIAIJWithSplitArrays()

Level:developer
Location:src/mat/impls/aij/mpi/mpiaij.c
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