jsat.datatransform

Interface FastICA.NegEntropyFunc

All Known Implementing Classes:

FastICA.DefaultNegEntropyFunc

Enclosing class:

FastICA

public static interface FastICA.NegEntropyFunc

The FastICA algorithm requires a function f(x) to be used iteratively in the algorithm, but only makes use of the first and second derivatives of the algorithm.

Method Summary

Modifier and Type	Method and Description
double	deriv1(double x)
double	deriv2(double x, double d1)

Method Detail

deriv1

double deriv1(double x)

Parameters:

x - the input to the function

Returns:

the first derivative of this function

deriv2

double deriv2(double x,
              double d1)

Parameters:

x - the input to the function

d1 - the first derivative of this function (from deriv1(double))

Returns:

the second derivative of this function