petsc-3.7.1 2016-05-15
Report Typos and Errors

MatPreallocateSet

Indicates the locations (rows and columns) in the matrix where nonzeros will be inserted using a local number of the rows and columns

Synopsis

#include <petscmat.h>
PetscErrorCode MatPreallocateSet(PetscInt nrows, PetscInt *rows,PetscInt ncols, PetscInt *cols,PetscInt *dnz, PetscInt *onz)
Not Collective Many br

Input Parameters

row - the row Many br
ncols - the number of columns in the matrix Many br
cols - the columns indicated Many br

Output Parameters

dnz - the array that will be passed to the matrix preallocation routines Many br
ozn - the other array passed to the matrix preallocation routines Many br

Many br

Notes

See Users-Manual: Chapter 14 Hints for Performance Tuning for more details. Many br

Do not malloc or free dnz and onz that is handled internally by these routines Many br

This is a MACRO not a function because it uses variables declared in MatPreallocateInitialize(). Many br

See Also

MatPreallocateFinalize(), MatPreallocateSet(), MatPreallocateSymmetricSetBlock(), MatPreallocateInitialize(),
MatPreallocateInitialize(), MatPreallocateSetLocal() Many br

Level:intermediate
Location:
src/mat/../../include/petscmat.h
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages