de.up.ling.irtg.util

Class LogSpaceOperations

java.lang.Object

de.up.ling.irtg.util.LogSpaceOperations

public class LogSpaceOperations
extends Object

This implements some additional operations that assume that double values have been projected to their log to combat under- and overflow.

Author:

christoph_teichmann

Field Summary

Fields

Modifier and Type	Field and Description
static double	THRESHOLD_1P A threshold for considering a number x close enough to 0 to use the approximation that Math.log(1.0+x) is approximately x.

Constructor Summary

Constructors

Constructor and Description
LogSpaceOperations()

Method Summary

Modifier and Type	Method and Description
static double	add(double first, double second) Adds to numbers that are given via their natural logarithm, the result is the natural logarithm of the addition.

Methods inherited from class java.lang.Object

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

Field Detail

THRESHOLD_1P

public static double THRESHOLD_1P

A threshold for considering a number x close enough to 0 to use the approximation that Math.log(1.0+x) is approximately x.

Constructor Detail

LogSpaceOperations

public LogSpaceOperations()

Method Detail

add

public static double add(double first,
                         double second)

Adds to numbers that are given via their natural logarithm, the result is the natural logarithm of the addition.

Parameters:

first -

second -

Returns: