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#
MatPreallocateEnd(), MatPreallocateSet(), MatPreallocateSymmetricSetBlock()
MatPreallocateBegin(), MatPreallocateSymmetricSetLocalBlock()
Level#
intermediate
Location#
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages