petsc-3.9.2 2018-05-20
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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

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).

Level

intermediate

Location

src/vec/is/is/interface/index.c

Implementations

ISInvertPermutation_Block in src/vec/is/is/impls/block/block.c
ISInvertPermutation_General in src/vec/is/is/impls/general/general.c
ISInvertPermutation_Stride in src/vec/is/is/impls/stride/stride.c

Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages