petsc3.13.6 20200929
ISComplement
Given an index set (IS) generates the complement index set. That is all all indices that are NOT in the given set.
Synopsis
#include "petscis.h"
PetscErrorCode ISComplement(IS is,PetscInt nmin,PetscInt nmax,IS *isout)
Collective on IS
Input Parameter
 is   the index set

 nmin   the first index desired in the local part of the complement

 nmax   the largest index desired in the local part of the complement (note that all indices in is must be greater or equal to nmin and less than nmax)

Output Parameter
isout the complement
Notes
The communicator for this new IS is the same as for the input IS
For a parallel IS, this will generate the local part of the complement on each process
To generate the entire complement (on each process) of a parallel IS, first call ISAllGather() and then
call this routine.
See Also
ISCreateGeneral(), ISCreateStride(), ISCreateBlock(), ISAllGather()
Level
intermediate
Location
src/vec/is/is/utils/iscoloring.c
Examples
src/vec/vec/utils/tagger/tutorials/ex1.c.html
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages