## Class Logistic

• All Implemented Interfaces:
DoubleUnaryOperator, UnivariateDifferentiableFunction, UnivariateFunction

public class Logistic
extends Object
implements UnivariateDifferentiableFunction
Since:
3.0
• ### Nested Class Summary

Nested Classes
Modifier and Type Class Description
static class  Logistic.Parametric
Parametric function where the input array contains the parameters of the logistic function.
• ### Constructor Summary

Constructors
Constructor Description
Logistic​(double k, double m, double b, double q, double a, double n)
• ### Method Summary

All Methods
Modifier and Type Method Description
double value​(double x)
Compute the value of the function.
DerivativeStructure value​(DerivativeStructure t)
Simple mathematical function.
• ### Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### Methods inherited from interface java.util.function.DoubleUnaryOperator

andThen, compose
• ### Methods inherited from interface org.apache.commons.math4.legacy.analysis.UnivariateFunction

applyAsDouble
• ### Constructor Detail

• #### Logistic

public Logistic​(double k,
double m,
double b,
double q,
double a,
double n)
throws NotStrictlyPositiveException
Parameters:
k - If b > 0, value of the function for x going towards +∞. If b < 0, value of the function for x going towards -∞.
m - Abscissa of maximum growth.
b - Growth rate.
q - Parameter that affects the position of the curve along the ordinate axis.
a - If b > 0, value of the function for x going towards -∞. If b < 0, value of the function for x going towards +∞.
n - Parameter that affects near which asymptote the maximum growth occurs.
Throws:
NotStrictlyPositiveException - if n <= 0.
• ### Method Detail

• #### value

public double value​(double x)
Compute the value of the function.
Specified by:
value in interface UnivariateFunction
Parameters:
x - Point at which the function value should be computed.
Returns:
the value of the function.
• #### value

public DerivativeStructure value​(DerivativeStructure t)
Simple mathematical function.

UnivariateDifferentiableFunction classes compute both the value and the first derivative of the function.

Specified by:
value in interface UnivariateDifferentiableFunction
Parameters:
t - function input value
Returns:
function result
Since:
3.1