com.perisic.function
Class LinCombOfFunctions

java.lang.Object
  com.perisic.function.AnyFunction
      com.perisic.function.LinCombOfFunctions

Direct Known Subclasses:

FourFunctions

public class LinCombOfFunctions
extends AnyFunction

f(x) = w1 * f1(x) + ... + wn * fn(x) n is the number of weights (length of the weight vector) If the number of weights is less than the number of functions, they will be considered as 0. If there are more weights than functions the exceeding weights will be ignored.

Copyright:(c) Marc Conrad, Tim French 2010; Usage of the works is permitted provided that this instrument is retained with the works, so that any entity that uses the works is notified of this instrument. DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.

Author:

Marc Conrad

Constructor Summary

LinCombOfFunctions(AnyFunction[] inputFunctions, double[] initialWeights)

Method Summary

double	eval(double x) Evaluates the weighted combination of the functions at x.
void	setWeights(double[] theWeightsIn) Sets the weights explicitly.

Methods inherited from class com.perisic.function.AnyFunction

addToImage, addToImage, getImage, getImage, main, normalizeResult

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LinCombOfFunctions

public LinCombOfFunctions(AnyFunction[] inputFunctions,
                          double[] initialWeights)

Parameters:

inputFunctions - the functions {f1, ..., fn}

initialWeights - the weights for the functions, can be set to null (which returns const zero when evaluated)

Method Detail

setWeights

public void setWeights(double[] theWeightsIn)

Sets the weights explicitly.

Parameters:

theWeightsIn - the weights.

eval

public double eval(double x)

Evaluates the weighted combination of the functions at x. The

Specified by:

eval in class AnyFunction

Parameters:

x - The value against which the function is evaluated.

Returns:

f(x) where f is this object.