petsc-master 2020-11-30
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MatPreallocateSetLocalBlock

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 MatPreallocateSetLocalBlock(ISLocalToGlobalMappping map,PetscInt nrows, PetscInt *rows,PetscInt ncols, PetscInt *cols,PetscInt *dnz, PetscInt *onz)
Not Collective

Input Parameters

map - the row mapping from local numbering to global numbering
nrows - the number of rows indicated
rows - the indices of the rows
cmap - the column mapping from local to global numbering
ncols - the number of columns in the matrix
cols - the columns indicated
dnz - the array that will be passed to the matrix preallocation routines
onz - the other array passed to the matrix preallocation routines

Notes

See Users-Manual: ch_performance for more details.

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

See Also

MatPreallocateFinalize(), MatPreallocateSet(), MatPreallocateSymmetricSetBlock()
MatPreallocateInitialize(), MatPreallocateSymmetricSetLocalBlock()

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