petsc-3.4.2 2013-07-02

# MatXAIJSetPreallocation

set preallocation for serial and parallel AIJ, BAIJ, and SBAIJ matrices

### 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 blocks per block row of diagonal part of parallel matrix
| onnz | - number of nonzero blocks per block row of off-diagonal part of parallel matrix
| dnnzu | - number of nonzero blocks per block row of upper-triangular part of diagonal part of parallel matrix
| onnzu | - number of nonzero 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