JSci.maths
Class FourierMath

java.lang.Object
  JSci.maths.AbstractMath
      JSci.maths.FourierMath

All Implemented Interfaces:

NumericalConstants

public final class FourierMath

extends AbstractMath

implements NumericalConstants

The Fourier math library. This class cannot be subclassed or instantiated because all methods are static.

PlanetMath references:

FourierTransform

Field Summary

Fields inherited from interface JSci.maths.NumericalConstants

GAMMA, GOLDEN_RATIO, LOG10, SQRT2, SQRT2PI, TWO_PI

Method Summary

static Complex[]	inverseTransform(Complex[] data) Inverse Fourier transform.
static Complex[]	inverseTransform(double[] data) Inverse Fourier transform.
static Complex[]	inverseTransform(double[] dataReal, double[] dataImag) Inverse Fourier transform.
static Complex[]	sort(Complex[] output) Sorts the output from the Fourier transfom methods into ascending frequency/time order.
static Complex[]	transform(Complex[] data) Fourier transform.
static Complex[]	transform(double[] data) Fourier transform.
static Complex[]	transform(double[] dataReal, double[] dataImag) Fourier transform.

Methods inherited from class java.lang.Object

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

Method Detail

transform

public static Complex[] transform(Complex[] data)

Fourier transform.

Returns:

an array containing positive frequencies in ascending order followed by negative frequencies in ascending order.

transform

public static Complex[] transform(double[] dataReal,
                                  double[] dataImag)

Fourier transform.

Returns:

an array containing positive frequencies in ascending order followed by negative frequencies in ascending order.

transform

public static Complex[] transform(double[] data)

Fourier transform.

Returns:

an array containing positive frequencies in ascending order followed by negative frequencies in ascending order.

inverseTransform

public static Complex[] inverseTransform(Complex[] data)

Inverse Fourier transform.

Returns:

an array containing the positive time part of the signal followed by the negative time part.

inverseTransform

public static Complex[] inverseTransform(double[] dataReal,
                                         double[] dataImag)

Inverse Fourier transform.

Returns:

an array containing the positive time part of the signal followed by the negative time part.

inverseTransform

public static Complex[] inverseTransform(double[] data)

Inverse Fourier transform.

Returns:

an array containing the positive time part of the signal followed by the negative time part.

sort

public static Complex[] sort(Complex[] output)

Sorts the output from the Fourier transfom methods into ascending frequency/time order.