Package org.cicirello.permutations.distance

Class ScrambleDistance

java.lang.Object

org.cicirello.permutations.distance.ScrambleDistance

All Implemented Interfaces:

NormalizedPermutationDistanceMeasurer, NormalizedPermutationDistanceMeasurerDouble, PermutationDistanceMeasurer, PermutationDistanceMeasurerDouble

public final class ScrambleDistance
extends Object
implements NormalizedPermutationDistanceMeasurer

Scramble Distance:

Scramble Distance is the minimum number of random shufflings needed to transform one permutation into the other. This was implemented for a very specific purpose, and unlikely to be subsequently useful.

The scramble distance is 0 if permutation p1 is identical to p2. Otherwise, scramble distance is 1.

Runtime: O(n), where n is the permutation length.

Constructor Summary

Constructors

Constructor	Description
ScrambleDistance()	Constructs the distance measurer as specified in the class documentation.

Method Summary

Modifier and Type	Method	Description
int	distance(Permutation p1, Permutation p2)	Measures the distance between two permutations.
int	max(int length)	Computes the maximum possible distance between permutations of a specified length.

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.NormalizedPermutationDistanceMeasurer

maxf, normalizedDistance

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

distancef

Constructor Detail

ScrambleDistance

public ScrambleDistance()

Constructs the distance measurer as specified in the class documentation.

Method Detail

distance

public int distance(Permutation p1,
                    Permutation p2)

Description copied from interface: PermutationDistanceMeasurer

Measures the distance between two permutations.

Specified by:

distance in interface PermutationDistanceMeasurer

Parameters:

p1 - first permutation

p2 - second permutation

Returns:

distance between p1 and p2

max

public int max(int length)

Description copied from interface: NormalizedPermutationDistanceMeasurer

Computes the maximum possible distance between permutations of a specified length.

Specified by:

max in interface NormalizedPermutationDistanceMeasurer

Parameters:

length - Permutation length.

Returns:

the maximum distance between a pair of permutations of the specified length.