DoubleDHT_2D (math 11.1.0 API)

java.lang.Object
- de.gsi.math.spectra.dht.DoubleDHT_2D

```
public class DoubleDHT_2D
extends java.lang.Object
```
Computes 2D Discrete Hartley Transform (DHT) of real, double precision data. The sizes of both dimensions can be arbitrary numbers. This is a parallel implementation optimized for SMP systems.

Part of code is derived from General Purpose FFT Package written by Takuya Ooura (http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html)

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

Constructor Summary

Constructors
Constructor Description

DoubleDHT_2D(int rows, int column)
Creates new instance of DoubleDHT_2D.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`forward(double[] a)`	Computes 2D real, forward DHT leaving the result in `a`.
`void`	`forward(double[][] a)`	Computes 2D real, forward DHT leaving the result in `a`.
`void`	`inverse(double[][] a, boolean scale)`	Computes 2D real, inverse DHT leaving the result in `a`.
`void`	`inverse(double[] a, boolean scale)`	Computes 2D 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_2D
```
public DoubleDHT_2D(int rows,
                    int column)
```
    Creates new instance of DoubleDHT_2D.
    
    Parameters:
    
    rows - number of rows
    
    column - number of columns
- Method Detail
  - forward
```
public void forward(double[] a)
```
    Computes 2D real, forward DHT leaving the result in a. The data is stored in 1D array in row-major order.
    
    Parameters:
    
    a - data to transform
  - forward
```
public void forward(double[][] a)
```
    Computes 2D real, forward DHT leaving the result in a. The data is stored in 2D array.
    
    Parameters:
    
    a - data to transform
  - inverse
```
public void inverse(double[] a,
                    boolean scale)
```
    Computes 2D real, inverse DHT leaving the result in a. The data is stored in 1D array in row-major order.
    
    Parameters:
    
    a - data to transform
    
    scale - if true then scaling is performed
  - inverse
```
public void inverse(double[][] a,
                    boolean scale)
```
    Computes 2D real, inverse DHT leaving the result in a. The data is stored in 2D array.
    
    Parameters:
    
    a - data to transform
    
    scale - if true then scaling is performed