Module org.cicirello.jpt

Package org.cicirello.permutations.distance

Class CyclicIndependentDistance

java.lang.Object

org.cicirello.permutations.distance.CyclicIndependentDistance

All Implemented Interfaces:

PermutationDistanceMeasurer, PermutationDistanceMeasurerDouble

public final class CyclicIndependentDistance
extends Object
implements PermutationDistanceMeasurer

This class implements the concept of a cyclic independent distance measure. This is relevant if any rotation of the permutation has the same problem dependent interpretation.

In this case, this class computes the minimum of the distance from permutation p1 to rotations of p2, where the underlying distance measure is passed as a parameter to the constructor.

Constructor Summary

Constructors

Constructor	Description
CyclicIndependentDistance(PermutationDistanceMeasurer d)	Constructs a distance measure for measuring distance with cyclic independence, such that distance = min_{i in [0,N)} distance(p1,rotate(p2,i))

Method Summary

Modifier and Type	Method	Description
int	distance(Permutation p1, Permutation p2)	Measures the distance between two permutations, with cyclic independence: distance = min_{i in [0,N)} distance(p1,rotate(p2,i))

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.cicirello.permutations.distance.PermutationDistanceMeasurer

distancef

Constructor Details

CyclicIndependentDistance

public CyclicIndependentDistance(PermutationDistanceMeasurer d)

Constructs a distance measure for measuring distance with cyclic independence, such that distance = min_{i in [0,N)} distance(p1,rotate(p2,i))

Parameters:

d - A distance measure.

Method Details

distance

public int distance(Permutation p1,
 Permutation p2)

Measures the distance between two permutations, with cyclic independence: distance = min_{i in [0,N)} distance(p1,rotate(p2,i))

Specified by:

distance in interface PermutationDistanceMeasurer

Parameters:

p1 - first permutation

p2 - second permutation

Returns:

distance between p1 and p2

Throws:

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