Module org.cicirello.jpt

Package org.cicirello.permutations.distance

Class ReversalIndependentDistanceDouble

java.lang.Object

org.cicirello.permutations.distance.ReversalIndependentDistanceDouble

All Implemented Interfaces:

PermutationDistanceMeasurerDouble

public final class ReversalIndependentDistanceDouble
extends Object
implements PermutationDistanceMeasurerDouble

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.

Constructor Summary

Constructors

Constructor	Description
ReversalIndependentDistanceDouble(PermutationDistanceMeasurerDouble 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	Description
double	distancef(Permutation p1, Permutation p2)	Measures the distance between two permutations, with reversal independence: distance = min { distance(p1,p2), distance(p1,reverse(p2)) }

Methods inherited from class java.lang.Object

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

Constructor Details

ReversalIndependentDistanceDouble

public ReversalIndependentDistanceDouble(PermutationDistanceMeasurerDouble 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 Details

distancef

public double distancef(Permutation p1,
 Permutation p2)

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

Specified by:

distancef in interface PermutationDistanceMeasurerDouble

Parameters:

p1 - first permutation

p2 - second permutation

Returns:

distance between p1 and p2

Throws:

IllegalArgumentException - if p1.length() is not equal to p2.length().