jm.music.tools.fuzzy

Class FuzzyNumber

java.lang.Object

jm.music.tools.fuzzy.FuzzyNumber

public class FuzzyNumber
extends java.lang.Object

This class describes a fuzzy number with a triangular memebership function. Fuzzy numbers can be added to a fuzzy set. The number has three main properties, peak, minimum, and maximum, which describe the apex, left corner and right corner of the triangle. The triangle is normalised in the vertical direction, so membership values will be between 0.0 and 1.0. The degree of membership is computed by the getMembership method.

Constructor Summary

Constructors

Constructor and Description
FuzzyNumber(double peak, double min, double max) Create a new fuzzy number.

Method Summary

Methods

Modifier and Type	Method and Description
double	getMax() Return the current value for the right corner of the triangular membership function.
double	getMembership(double value) Calculate the degree of membership of a value within this fuzzy number.
double	getMin() Return the current value for the left corner of the triangular membership function.
double	getPeak() Return the current value for the centre of the triangular membership function.
void	setMax(double newValue) Specify a value for the right corner of the triangular membership function.
void	setMin(double newValue) Specify a value for the left corner of the triangular membership function.
void	setPeak(double newValue) Specify a value for the centre of the triangular membership function.

Methods inherited from class java.lang.Object

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

Constructor Detail

FuzzyNumber

public FuzzyNumber(double peak,
           double min,
           double max)

Create a new fuzzy number.

Parameters:

peak - - The center value for the triangular membership function.

min - - The leftmost or minimum value for the triangular membership function.

max - - The rightmost or maximum value for the triangular membership function.

Method Detail

getMembership

public double getMembership(double value)

Calculate the degree of membership of a value within this fuzzy number.

Parameters:

value - - The number to be tested for its membership.

Returns:

The degree of membership within this fuzzy number.

setPeak

public void setPeak(double newValue)

Specify a value for the centre of the triangular membership function.

Parameters:

newValue - - The number to set the peak to.

getPeak

public double getPeak()

Return the current value for the centre of the triangular membership function.

Returns:

peak - The number currently set as the triangle's peak.

setMin

public void setMin(double newValue)

Specify a value for the left corner of the triangular membership function.

Parameters:

newValue - - The number to set the minimum to.

getMin

public double getMin()

Return the current value for the left corner of the triangular membership function.

Returns:

min - The number currently set as the triangle's left corner.

setMax

public void setMax(double newValue)

Specify a value for the right corner of the triangular membership function.

Parameters:

newValue - - The number to set the peak to.

getMax

public double getMax()

Return the current value for the right corner of the triangular membership function.

Returns:

max - The number currently set as the triangle's right corner.