LogCosh

java.lang.Object

smile.ica.LogCosh

All Implemented Interfaces:: Serializable, DifferentiableFunction, Function

public class LogCosh extends Object implements DifferentiableFunction

A good general-purpose contrast function for ICA.

See Also:

Constructor Summary

Constructors

Constructor

Description

LogCosh()
Method Summary

Modifier and Type

Method

Description

double

f(double x)

Computes the value of the function at x.

double

g(double x)

Computes the gradient/derivative at x.

double

g2(double x)

Compute the second-order derivative at x.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface smile.math.Function
apply, inv

Constructor Details
- LogCosh
  
  public LogCosh()
Method Details
- f
  
  public double f(double x)
  
  Description copied from interface: Function
  
  Computes the value of the function at x.
  
  Specified by:
  
  f in interface Function
  
  Parameters:
  
  x - a real number.
  
  Returns:
  
  the function value.
- g
  
  public double g(double x)
  
  Description copied from interface: DifferentiableFunction
  
  Computes the gradient/derivative at x.
  
  Specified by:
  
  g in interface DifferentiableFunction
  
  Parameters:
  
  x - a real number.
  
  Returns:
  
  the derivative.
- g2
  
  public double g2(double x)
  
  Description copied from interface: DifferentiableFunction
  
  Compute the second-order derivative at x.
  
  Specified by:
  
  g2 in interface DifferentiableFunction
  
  Parameters:
  
  x - a real number.
  
  Returns:
  
  the second-order derivative.