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java.lang.Objectorg.apache.commons.math3.analysis.function.Sigmoid
public class Sigmoid
Sigmoid function.
It is the inverse of the logit
function.
A more flexible version, the generalised logistic, is implemented
by the Logistic
class.
Nested Class Summary | |
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static class |
Sigmoid.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 |
hi
Higher asymptote. |
private double |
lo
Lower asymptote. |
Constructor Summary | |
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Sigmoid()
Usual sigmoid function, where the lower asymptote is 0 and the higher asymptote is 1. |
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Sigmoid(double lo,
double hi)
Sigmoid function. |
Method Summary | |
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UnivariateFunction |
derivative()
Returns the derivative of the function |
double |
value(double x)
Compute the value of the function. |
private static double |
value(double x,
double lo,
double hi)
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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 lo
private final double hi
Constructor Detail |
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public Sigmoid()
public Sigmoid(double lo, double hi)
lo
- Lower asymptote.hi
- Higher asymptote.Method Detail |
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public UnivariateFunction derivative()
derivative
in interface DifferentiableUnivariateFunction
public double value(double x)
value
in interface UnivariateFunction
x
- Point at which the function value should be computed.
private static double value(double x, double lo, double hi)
x
- Value at which to compute the sigmoid.lo
- Lower asymptote.hi
- Higher asymptote.
x
.
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