Package org.hipparchus.analysis.function
Class Logistic
- java.lang.Object
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- org.hipparchus.analysis.function.Logistic
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- All Implemented Interfaces:
UnivariateDifferentiableFunction
,UnivariateFunction
public class Logistic extends Object implements UnivariateDifferentiableFunction
Generalised logistic function.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
Logistic.Parametric
Parametric function where the input array contains the parameters of thelogistic function
, ordered as follows: k m b q a n
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Constructor Summary
Constructors Constructor Description Logistic(double k, double m, double b, double q, double a, double n)
Simple constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description double
value(double x)
Compute the value of the function.<T extends Derivative<T>>
Tvalue(T t)
Compute the value for the function.
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Constructor Detail
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Logistic
public Logistic(double k, double m, double b, double q, double a, double n) throws MathIllegalArgumentException
Simple constructor.- Parameters:
k
- Ifb > 0
, value of the function for x going towards +∞. Ifb < 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
- Ifb > 0
, value of the function for x going towards -∞. Ifb < 0
, value of the function for x going towards +∞.n
- Parameter that affects near which asymptote the maximum growth occurs.- Throws:
MathIllegalArgumentException
- ifn <= 0
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Method Detail
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value
public double value(double x)
Compute the value of the function.- Specified by:
value
in interfaceUnivariateFunction
- Parameters:
x
- Point at which the function value should be computed.- Returns:
- the value of the function.
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value
public <T extends Derivative<T>> T value(T t)
Compute the value for the function.- Specified by:
value
in interfaceUnivariateDifferentiableFunction
- Type Parameters:
T
- the type of the field elements- Parameters:
t
- the point for which the function value should be computed- Returns:
- the value
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