ISSum#
Computes the sum (union) of two index sets.
Synopsis#
#include "petscis.h"
PetscErrorCode ISSum(IS is1, IS is2, IS *is3)
Only sequential version (at the moment)
Input Parameters#
is1 - index set to be extended
is2 - index values to be added
Output Parameter#
is3 - the sum; this can not be
is1oris2
Notes#
If n1 and n2 are the sizes of the sets, this takes O(n1+n2) time;
Both index sets need to be sorted on input.
The sum is computed separately on each MPI rank
See Also#
Low-level Vector Communication, IS, ISDestroy(), ISView(), ISDifference(), ISExpand()
Level#
intermediate
Location#
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages