ISExpand#
Computes the union of two index sets, by concatenating 2 lists and removing duplicates.
Synopsis#
#include "petscis.h"
PetscErrorCode ISExpand(IS is1, IS is2, IS *isout)
Collective on is1
Input Parameters#
is1 - first index set
is2 - index values to be added
Output Parameters#
isout - is1 + is2 The index set is2 is appended to is1 removing duplicates
Notes#
Negative values are removed from the lists. This requires O(imax-imin) memory and O(imax-imin) work, where imin and imax are the bounds on the indices in is1 and is2.
The IS’s do not need to be sorted.
The operations are performed separately on each MPI rank
See Also#
Low-level Vector Communication, IS
, ISDestroy()
, ISView()
, ISDifference()
, ISSum()
, ISIntersect()
Level#
intermediate
Location#
Examples#
src/ksp/ksp/tutorials/ex81.c.html
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages