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java.lang.Objectorg.apache.commons.math3.analysis.function.Logistic
public class Logistic
Generalised logistic function.
Nested Class Summary | |
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static class |
Logistic.Parametric
Parametric function where the input array contains the parameters of the logit function, ordered as follows: Lower asymptote Higher asymptote |
Field Summary | |
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private double |
a
Lower asymptote. |
private double |
b
Growth rate. |
private double |
k
Upper asymptote. |
private double |
m
Abscissa of maximum growth. |
private double |
oneOverN
Parameter that affects near which asymptote maximum growth occurs. |
private double |
q
Parameter that affects the position of the curve along the ordinate axis. |
Constructor Summary | |
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Logistic(double k,
double m,
double b,
double q,
double a,
double n)
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Method Summary | |
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UnivariateFunction |
derivative()
Deprecated. as of 3.1, replaced by value(DerivativeStructure) |
DerivativeStructure |
value(DerivativeStructure t)
Simple mathematical function. |
double |
value(double x)
Compute the value of the function. |
private static double |
value(double mMinusX,
double k,
double b,
double q,
double a,
double oneOverN)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private final double a
private final double k
private final double b
private final double oneOverN
private final double q
private final double m
Constructor Detail |
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public Logistic(double k, double m, double b, double q, double a, double n) throws NotStrictlyPositiveException
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.
NotStrictlyPositiveException
- if n <= 0
.Method Detail |
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public double value(double x)
value
in interface UnivariateFunction
x
- Point at which the function value should be computed.
@Deprecated public UnivariateFunction derivative()
value(DerivativeStructure)
derivative
in interface DifferentiableUnivariateFunction
private static double value(double mMinusX, double k, double b, double q, double a, double oneOverN)
mMinusX
- m - x
.k
- k
.b
- b
.q
- q
.a
- a
.oneOverN
- 1 / n
.
public DerivativeStructure value(DerivativeStructure t)
UnivariateDifferentiableFunction
classes compute both the
value and the first derivative of the function.
value
in interface UnivariateDifferentiableFunction
t
- function input value
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