Catalano.Fuzzy

Class PiecewiseLinearFunction

java.lang.Object

Catalano.Fuzzy.PiecewiseLinearFunction

All Implemented Interfaces:

IMembershipFunction

Direct Known Subclasses:

TrapezoidalFunction

public class PiecewiseLinearFunction
extends java.lang.Object
implements IMembershipFunction

Membership function composed by several connected linear functions.

Constructor Summary

Constructors

Constructor and Description
PiecewiseLinearFunction() Initializes a new instance of the class.
PiecewiseLinearFunction(FloatPoint[] points) Initializes a new instance of the class.

Method Summary

Modifier and Type	Method and Description
float	GetMembership(float x) Calculate membership of a given value to the fuzzy set.
float	LeftLimit() The leftmost x value of the membership function.
float	RightLimit() The rightmost x value of the membership function.

Methods inherited from class java.lang.Object

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

Constructor Detail

PiecewiseLinearFunction

public PiecewiseLinearFunction()

Initializes a new instance of the class. This constructor must be used only by inherited classes to create the points vector after the instantiation.

PiecewiseLinearFunction

public PiecewiseLinearFunction(FloatPoint[] points)

Initializes a new instance of the class.

Parameters:

points - Array of (X,Y) coordinates of each start/end of the lines. Points must be in crescent order on X axis. Y value of points must be in the range of [0, 1].

Method Detail

GetMembership

public float GetMembership(float x)

Description copied from interface: IMembershipFunction

Calculate membership of a given value to the fuzzy set.

Specified by:

GetMembership in interface IMembershipFunction

Parameters:

x - Value which membership will to be calculated.

Returns:

Degree of membership [0..1] of the value to the fuzzy set.

LeftLimit

public float LeftLimit()

Description copied from interface: IMembershipFunction

The leftmost x value of the membership function.

Specified by:

LeftLimit in interface IMembershipFunction

Returns:

x.

RightLimit

public float RightLimit()

Description copied from interface: IMembershipFunction

The rightmost x value of the membership function.

Specified by:

RightLimit in interface IMembershipFunction

Returns:

x.