org.apache.commons.math3.analysis.function

## Class Logistic

• ### Nested Class Summary

Nested Classes
Modifier and Type Class and Description
static class  Logistic.Parametric
Parametric function where the input array contains the parameters of the logistic function, ordered as follows: k m b q a n
• ### Constructor Summary

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

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

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
• ### 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.
• #### derivative

@Deprecated
public UnivariateFunction derivative()
Deprecated. as of 3.1, replaced by value(DerivativeStructure)
Returns the derivative of the function
Specified by:
derivative in interface DifferentiableUnivariateFunction
Returns:
the derivative 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