petsc-3.14.6 2021-03-30
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MatXAIJSetPreallocation

 set preallocation for serial and parallel AIJ, BAIJ, and SBAIJ matrices and their unassembled versions.

Synopsis

#include "petscmat.h"  
PetscErrorCode MatXAIJSetPreallocation(Mat A,PetscInt bs,const PetscInt dnnz[],const PetscInt onnz[],const PetscInt dnnzu[],const PetscInt onnzu[])
Collective on Mat

Input Arguments

A - matrix being preallocated
bs - block size
dnnz - number of nonzero column blocks per block row of diagonal part of parallel matrix
onnz - number of nonzero column blocks per block row of off-diagonal part of parallel matrix
dnnzu - number of nonzero column blocks per block row of upper-triangular part of diagonal part of parallel matrix
onnzu - number of nonzero column blocks per block row of upper-triangular part of off-diagonal part of parallel matrix

See Also

MatSeqAIJSetPreallocation(), MatMPIAIJSetPreallocation(), MatSeqBAIJSetPreallocation(), MatMPIBAIJSetPreallocation(), MatSeqSBAIJSetPreallocation(), MatMPISBAIJSetPreallocation(),
PetscSplitOwnership()

Level

beginner

Location

src/mat/utils/gcreate.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages