Class FourierSeries

java.lang.Object

org.ojalgo.function.series.FourierSeries

All Implemented Interfaces:

DoubleUnaryOperator, Function<Double,Double>, UnaryOperator<Double>, BasicFunction, PrimitiveFunction.Unary, UnaryFunction<Double>

public class FourierSeries
extends Object
implements PrimitiveFunction.Unary

This is the real coefficient trigonometric form of the Fourier series.

Nested Class Summary

Nested classes/interfaces inherited from interface BasicFunction

BasicFunction.Differentiable<N,F>, BasicFunction.Integratable<N,F>, BasicFunction.PlainUnary<T,R>

Field Summary

Fields

Modifier and Type	Field	Description
private static final NumberContext	ACCURACY
private final double	myAngularFrequency
private final double[]	myCosCoefficients
private final double[]	mySinCoefficients

Constructor Summary

Constructors

Constructor	Description
FourierSeries(double period, double[] cosCoefficients, double[] sinCoefficients)
FourierSeries(double period, ComplexNumber... coefficients)

Method Summary

Modifier and Type	Method	Description
static FourierSeries	estimate(DoubleUnaryOperator function, PrimitiveFunction.SampleDomain sampleDomain)
static FourierSeries	estimate(PeriodicFunction function, int nbSamples)
double	invoke(double arg)

Methods inherited from class Object

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

Methods inherited from interface DoubleUnaryOperator

andThen, compose

Methods inherited from interface Function

andThen, compose

Methods inherited from interface PrimitiveFunction.Unary

invoke

Methods inherited from interface UnaryFunction

andThen, apply, applyAsDouble, compose, invoke, invoke, invoke, invoke, invoke

Field Details

ACCURACY

private static final NumberContext ACCURACY

myAngularFrequency

private final double myAngularFrequency

myCosCoefficients

private final double[] myCosCoefficients

mySinCoefficients

private final double[] mySinCoefficients

Constructor Details

FourierSeries

public FourierSeries(double period,
 ComplexNumber... coefficients)

Parameters:

period - The period of the function

coefficients - The Fourier coefficients. The first coefficient is the constant term (the real part of that complex number), then the following coefficients are the coefficients of the cos and sin terms with increasing frequency.

FourierSeries

FourierSeries(double period,
 double[] cosCoefficients,
 double[] sinCoefficients)

Method Details

estimate

public static FourierSeries estimate(DoubleUnaryOperator function,
 PrimitiveFunction.SampleDomain sampleDomain)

estimate

public static FourierSeries estimate(PeriodicFunction function,
 int nbSamples)

invoke

public double invoke(double arg)

Specified by:

invoke in interface UnaryFunction<Double>