edu.emory.mathcs.jtransforms.dht

Class DoubleDHT_1D

java.lang.Object

edu.emory.mathcs.jtransforms.dht.DoubleDHT_1D

public class DoubleDHT_1D
extends Object

Computes 1D Discrete Hartley Transform (DHT) of real, double precision data. The size of the data can be an arbitrary number. It uses FFT algorithm. This is a parallel implementation optimized for SMP systems.

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

Constructor Summary

Constructors

Constructor and Description
DoubleDHT_1D(int n) Creates new instance of DoubleDHT_1D.

Method Summary

Methods

Modifier and Type	Method and Description
void	forward(double[] a) Computes 1D real, forward DHT leaving the result in a.
void	forward(double[] a, int offa) Computes 1D real, forward DHT leaving the result in a.
void	inverse(double[] a, boolean scale) Computes 1D real, inverse DHT leaving the result in a.
void	inverse(double[] a, int offa, boolean scale) Computes 1D real, inverse DHT leaving the result in a.

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleDHT_1D

public DoubleDHT_1D(int n)

Creates new instance of DoubleDHT_1D.

Parameters:

n - size of data

Method Detail

forward

public void forward(double[] a)

Computes 1D real, forward DHT leaving the result in a.

Parameters:

a - data to transform

forward

public void forward(double[] a,
           int offa)

Computes 1D real, forward DHT leaving the result in a.

Parameters:

a - data to transform

offa - index of the first element in array a

inverse

public void inverse(double[] a,
           boolean scale)

Computes 1D real, inverse DHT leaving the result in a.

Parameters:

a - data to transform

scale - if true then scaling is performed

inverse

public void inverse(double[] a,
           int offa,
           boolean scale)

Computes 1D real, inverse DHT leaving the result in a.

Parameters:

a - data to transform

offa - index of the first element in array a

scale - if true then scaling is performed