ISInvertPermutation

Creates a new permutation that is the inverse of a given permutation.

Synopsis

#include "petscis.h" 
PetscErrorCode  ISInvertPermutation(IS is,PetscInt nlocal,IS *isout)
Collective on IS

Input Parameter

is - the index set
nlocal - number of indices on this processor in result (ignored for 1 proccessor) or use PETSC_DECIDE

Output Parameter

isout - the inverse permutation

Level: intermediate

Notes

For parallel index sets this does the complete parallel permutation, but the code is not efficient for huge index sets (10,000,000 indices).

Location:index.c