hu.ibello.functions

Class Logistic4Function

java.lang.Object

hu.ibello.functions.Logistic4Function

All Implemented Interfaces:

Function

Direct Known Subclasses:

Logistic4InverseFunction

public class Logistic4Function
extends Object
implements Function

A 4-parameter logistic function (4PL or symmetrical sigmodial).

 f(x) = y0 + (y1 - y0) / (1 + (x / c)^b)
 

Parameters are:

• y0
• y1
• b
• c

Author:

kokog

Constructor Summary

Constructors

Constructor and Description
Logistic4Function()

Method Summary

Modifier and Type	Method and Description
double	getB()
double	getC()
double	getParameter(int paramIndex) Returns the value of a parameter by index.
int	getParameterCount() How many parameters this function has?
double	getY0()
double	getY1()
void	setB(double b)
void	setC(double c)
void	setParameter(int paramIndex, double value) Sets the value of a parameter by index.
void	setY0(double d)
void	setY1(double a)
String	toString()
double	value(double x) Value of the function at x.

Methods inherited from class java.lang.Object

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

Methods inherited from interface hu.ibello.functions.Function

getFormattedParameter, getParameters, setParameters

Constructor Detail

Logistic4Function

public Logistic4Function()

Method Detail

getY0

public double getY0()

setY0

public void setY0(double d)

getY1

public double getY1()

setY1

public void setY1(double a)

getB

public double getB()

setB

public void setB(double b)

getC

public double getC()

setC

public void setC(double c)

getParameterCount

public int getParameterCount()

Description copied from interface: Function

How many parameters this function has?

Specified by:

getParameterCount in interface Function

Returns:

number of function parameters

value

public double value(double x)

Description copied from interface: Function

Value of the function at x.

Specified by:

value in interface Function

Parameters:

x - the input value

Returns:

function's value at x

getParameter

public double getParameter(int paramIndex)

Description copied from interface: Function

Returns the value of a parameter by index. The index of the first parameter is 0.

Specified by:

getParameter in interface Function

Parameters:

paramIndex - index of the parameter

Returns:

the parameter's value

setParameter

public void setParameter(int paramIndex,
                         double value)

Description copied from interface: Function

Sets the value of a parameter by index. The index of the first parameter is 0.

Specified by:

setParameter in interface Function

Parameters:

paramIndex - index of the parameter

value - new value of the parameter

toString

public String toString()

Overrides:

toString in class Object