org.cicirello.permutations.distance

Class ReversalIndependentDistance

java.lang.Object

org.cicirello.permutations.distance.ReversalIndependentDistance

All Implemented Interfaces:

PermutationDistanceMeasurer, PermutationDistanceMeasurerDouble

public final class ReversalIndependentDistance
extends Object
implements PermutationDistanceMeasurer

This class implements the concept of a reversal independent distance measure. This is relevant if the permutation and its reverse have the same problem dependent interpretation.

In this case, this class computes the minimum of distance(p1,p2) and distance(p1,reverse(p2)) for a given distance measure passed as a parameter to the constructor.

Since:

1.0

Constructor Summary

Constructors

Constructor and Description
ReversalIndependentDistance(PermutationDistanceMeasurer d) Constructs a distance measure for measuring distance with reversal independence, such that distance = min { distance(p1,p2), distance(p1,reverse(p2)) }

Method Summary

Modifier and Type	Method and Description
int	distance(Permutation p1, Permutation p2) Measures the distance between two permutations, with reversal independence: distance = min { distance(p1,p2), distance(p1,reverse(p2)) }
double	distancef(Permutation p1, Permutation p2) Measures the distance between two permutations

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReversalIndependentDistance

public ReversalIndependentDistance(PermutationDistanceMeasurer d)

Constructs a distance measure for measuring distance with reversal independence, such that distance = min { distance(p1,p2), distance(p1,reverse(p2)) }

Parameters:

d - A distance measure.

Method Detail

distance

public int distance(Permutation p1,
                    Permutation p2)

Measures the distance between two permutations, with reversal independence: distance = min { distance(p1,p2), distance(p1,reverse(p2)) }

Specified by:

distance in interface PermutationDistanceMeasurer

Parameters:

p1 - first permutation

p2 - second permutation

Returns:

distance between p1 and p2

distancef

public final double distancef(Permutation p1,
                              Permutation p2)

Measures the distance between two permutations

Specified by:

distancef in interface PermutationDistanceMeasurerDouble

Parameters:

p1 - first permutation

p2 - second permutation

Returns:

distance between p1 and p2