de.lmu.ifi.dbs.elki.distance

Class DistanceUtil

java.lang.Object

de.lmu.ifi.dbs.elki.distance.DistanceUtil

public final class DistanceUtil
extends Object

Class with distance related utility functions.

Constructor Summary

Constructors

Constructor and Description
DistanceUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	isDoubleDistanceFunction(DistanceFunction<?,?> df) Test whether a distance function is double-valued.
static boolean	isDoubleDistanceFunction(DistanceQuery<?,?> df) Test whether a distance query is double-valued.
static <D extends Distance<D>> D	max(D d1, D d2) Returns the maximum of the given Distances or the first, if none is greater than the other one.
static <D extends Distance<D>> D	min(D d1, D d2) Returns the minimum of the given Distances or the first, if none is less than the other one.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistanceUtil

public DistanceUtil()

Method Detail

max

public static <D extends Distance<D>> D max(D d1,
                            D d2)

Returns the maximum of the given Distances or the first, if none is greater than the other one.

Type Parameters:

D - distance type

Parameters:

d1 - first Distance

d2 - second Distance

Returns:

Distance the maximum of the given Distances or the first, if neither is greater than the other one

min

public static <D extends Distance<D>> D min(D d1,
                            D d2)

Returns the minimum of the given Distances or the first, if none is less than the other one.

Type Parameters:

D - distance type

Parameters:

d1 - first Distance

d2 - second Distance

Returns:

Distance the minimum of the given Distances or the first, if neither is less than the other one

isDoubleDistanceFunction

public static boolean isDoubleDistanceFunction(DistanceFunction<?,?> df)

Test whether a distance function is double-valued.

Parameters:

df - Distance function

Returns:

True when the distance function returns double values

isDoubleDistanceFunction

public static boolean isDoubleDistanceFunction(DistanceQuery<?,?> df)

Test whether a distance query is double-valued.

Parameters:

df - Distance function

Returns:

True when the distance function returns double values