Package 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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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

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

Constructor Details

HarmonicFunction

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

Simple constructor.

Parameters:

a - amplitude

omega - pulsation

phi - phase

Method Details

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