petsc-3.13.6 2020-09-29
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Indicates the locations (rows and columns) in the matrix where nonzeros will be inserted using a local number of the rows and columns


#include <petscmat.h>
PetscErrorCode MatPreallocateSetLocal(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


See Users-Manual: Chapter 14 Hints for Performance Tuning 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(), MatPreallocateSetLocalRemoveDups()




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