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.

Since:

1.0

Constructor Summary

Constructors

Constructor and 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 and 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))
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

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 Detail

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

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