public class Sigmoid extends Object implements UnivariateDifferentiableFunction, DifferentiableUnivariateFunction
logit function.
A more flexible version, the generalised logistic, is implemented
by the Logistic class.| Modifier and Type | Class and Description |
|---|---|
static class |
Sigmoid.Parametric
Parametric function where the input array contains the parameters of
the
sigmoid function, ordered
as follows:
Lower asymptote
Higher asymptote
|
| Constructor and Description |
|---|
Sigmoid()
Usual sigmoid function, where the lower asymptote is 0 and the higher
asymptote is 1.
|
Sigmoid(double lo,
double hi)
Sigmoid function.
|
| Modifier and Type | Method and Description |
|---|---|
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.
|
public Sigmoid()
public Sigmoid(double lo,
double hi)
lo - Lower asymptote.hi - Higher asymptote.@Deprecated public UnivariateFunction derivative()
value(DerivativeStructure)derivative in interface DifferentiableUnivariateFunctionpublic double value(double x)
value in interface UnivariateFunctionx - Point at which the function value should be computed.public DerivativeStructure value(DerivativeStructure t) throws DimensionMismatchException
UnivariateDifferentiableFunction classes compute both the
value and the first derivative of the function.
value in interface UnivariateDifferentiableFunctiont - function input valueDimensionMismatchException - if t is inconsistent with the
function's free parameters or orderCopyright © 2003–2016 The Apache Software Foundation. All rights reserved.