Package org.opennars.inference

Class UtilityFunctions

java.lang.Object

org.opennars.inference.UtilityFunctions

Direct Known Subclasses:

BudgetFunctions, TruthFunctions

public class UtilityFunctions
extends Object

Common functions on real numbers, mostly in [0,1].

Author:

Pei Wang, Patrick Hammer

Constructor Summary

Constructors

Constructor	Description
UtilityFunctions()

Method Summary

Modifier and Type	Method	Description
static double	and(double... arr)	A function where the output is conjunctively determined by the inputs
static float	aveAri(float... arr)	A function where the output is the arithmetic average the inputs
static float	aveGeo(float... arr)	A function where the output is the geometric average the inputs
static double	c2w(double c, Parameters narParameters)	A function to convert confidence to weight
static float	or(float... arr)	A function where the output is disjunctively determined by the inputs
static double	w2c(double w, Parameters narParameters)	A function to convert weight to confidence

Methods inherited from class java.lang.Object

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

Constructor Detail

UtilityFunctions

public UtilityFunctions()

Method Detail

and

public static final double and(double... arr)

A function where the output is conjunctively determined by the inputs

Parameters:

arr - The inputs, each in [0, 1]

Returns:

The output that is no larger than each input

or

public static final float or(float... arr)

A function where the output is disjunctively determined by the inputs

Parameters:

arr - The inputs, each in [0, 1]

Returns:

The output that is no smaller than each input

aveAri

public static final float aveAri(float... arr)

A function where the output is the arithmetic average the inputs

Parameters:

arr - The inputs, each in [0, 1]

Returns:

The arithmetic average the inputs

aveGeo

public static final float aveGeo(float... arr)

A function where the output is the geometric average the inputs

Parameters:

arr - The inputs, each in [0, 1]

Returns:

The geometric average the inputs

w2c

public static final double w2c(double w,
                               Parameters narParameters)

A function to convert weight to confidence

Parameters:

w - Weight of evidence, a non-negative real number

narParameters - parameters of the reasoner

Returns:

The corresponding confidence, in [0, 1)

c2w

public static final double c2w(double c,
                               Parameters narParameters)

A function to convert confidence to weight

Parameters:

c - confidence, in [0, 1)

narParameters - parameters of the reasoner

Returns:

The corresponding weight of evidence, a non-negative real number