moa.clusterers.outliers.utils.mtree

Class DistanceFunctions

java.lang.Object

moa.clusterers.outliers.utils.mtree.DistanceFunctions

public final class DistanceFunctions
extends Object

Some pre-defined implementations of distance functions.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	DistanceFunctions.EuclideanCoordinate An interface to represent coordinates in Euclidean spaces.

Field Summary

Fields

Modifier and Type	Field and Description
static DistanceFunction<DistanceFunctions.EuclideanCoordinate>	EUCLIDEAN A distance function object that calculates the distance between two euclidean coordinates.
static DistanceFunction<List<Double>>	EUCLIDEAN_DOUBLE_LIST A distance function object that calculates the distance between two coordinates represented by lists of Doubles.
static DistanceFunction<List<Integer>>	EUCLIDEAN_INTEGER_LIST A distance function object that calculates the distance between two coordinates represented by lists of Integers.

Method Summary

Methods

Modifier and Type	Method and Description
static <Data> DistanceFunction<Data>	cached(DistanceFunction<Data> distanceFunction) Creates a cached version of a distance function.
static double	euclidean(DistanceFunctions.EuclideanCoordinate coord1, DistanceFunctions.EuclideanCoordinate coord2) Calculates the distance between two euclidean coordinates.

Methods inherited from class java.lang.Object

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

Field Detail

EUCLIDEAN

public static final DistanceFunction<DistanceFunctions.EuclideanCoordinate> EUCLIDEAN

A distance function object that calculates the distance between two euclidean coordinates.

EUCLIDEAN_INTEGER_LIST

public static final DistanceFunction<List<Integer>> EUCLIDEAN_INTEGER_LIST

A distance function object that calculates the distance between two coordinates represented by lists of Integers.

EUCLIDEAN_DOUBLE_LIST

public static final DistanceFunction<List<Double>> EUCLIDEAN_DOUBLE_LIST

A distance function object that calculates the distance between two coordinates represented by lists of Doubles.

Method Detail

cached

public static <Data> DistanceFunction<Data> cached(DistanceFunction<Data> distanceFunction)

Creates a cached version of a distance function. This method is used internally by MTree to create a cached distance function to pass to the split function.

Parameters:

distanceFunction - The distance function to create a cached version of.

Returns:

The cached distance function.

euclidean

public static double euclidean(DistanceFunctions.EuclideanCoordinate coord1,
               DistanceFunctions.EuclideanCoordinate coord2)

Calculates the distance between two euclidean coordinates.