org.apache.commons.math.optimization.fitting
Class HarmonicFunction

java.lang.Object
  org.apache.commons.math.optimization.fitting.HarmonicFunction

All Implemented Interfaces:

DifferentiableUnivariateRealFunction, UnivariateRealFunction

public class HarmonicFunction
extends Object
implements DifferentiableUnivariateRealFunction

Harmonic function of the form f (t) = a cos (ω t + φ).

Since:

2.0

Version:

$Revision: 990655 $ $Date: 2010-08-29 23:49:40 +0200 (dim. 29 août 2010) $

Constructor Summary

HarmonicFunction(double a, double omega, double phi)
Simple constructor.

Method Summary

HarmonicFunction	derivative() Returns the derivative of the function
double	getAmplitude() Get the amplitude a.
double	getPhase() Get the phase φ.
double	getPulsation() Get the pulsation ω.
double	value(double x) Compute the value for the function.

Methods inherited from class java.lang.Object

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

Constructor Detail

HarmonicFunction

public HarmonicFunction(double a,
                        double omega,
                        double phi)

Simple constructor.

Parameters:

a - amplitude

omega - pulsation

phi - phase

Method Detail

value

public double value(double x)

Compute the value for the function.

Specified by:

value in interface UnivariateRealFunction

Parameters:

x - the point for which the function value should be computed

Returns:

the value

derivative

public HarmonicFunction derivative()

Returns the derivative of the function

Specified by:

derivative in interface DifferentiableUnivariateRealFunction

Returns:

the derivative function

getAmplitude

public double getAmplitude()

Get the amplitude a.

Returns:

amplitude a;

getPulsation

public double getPulsation()

Get the pulsation ω.

Returns:

pulsation ω

getPhase

public double getPhase()

Get the phase φ.

Returns:

phase φ