DoubleDCT_1D (math 11.1.0 API)

java.lang.Object
- de.gsi.math.spectra.dct.DoubleDCT_1D

```
public class DoubleDCT_1D
extends java.lang.Object
```
Computes 1D Discrete Cosine Transform (DCT) of double precision data. The size of data can be an arbitrary number. This is a parallel implementation of split-radix and mixed-radix algorithms optimized for SMP systems.

Part of the 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

DoubleDCT_1D(int n)
Creates new instance of DoubleDCT_1D.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`forward(double[] a, boolean scale)`	Computes 1D forward DCT (DCT-II) leaving the result in `a`.
`void`	`forward(double[] a, int offa, boolean scale)`	Computes 1D forward DCT (DCT-II) leaving the result in `a`.
`void`	`inverse(double[] a, boolean scale)`	Computes 1D inverse DCT (DCT-III) leaving the result in `a`.
`void`	`inverse(double[] a, int offa, boolean scale)`	Computes 1D inverse DCT (DCT-III) 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
  - DoubleDCT_1D
```
public DoubleDCT_1D(int n)
```
    Creates new instance of DoubleDCT_1D.
    
    Parameters:
    
    n - size of data
- Method Detail
  - forward
```
public void forward(double[] a,
                    boolean scale)
```
    Computes 1D forward DCT (DCT-II) leaving the result in a.
    
    Parameters:
    
    a - data to transform
    
    scale - if true then scaling is performed
  - forward
```
public void forward(double[] a,
                    int offa,
                    boolean scale)
```
    Computes 1D forward DCT (DCT-II) 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
  - inverse
```
public void inverse(double[] a,
                    boolean scale)
```
    Computes 1D inverse DCT (DCT-III) 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 inverse DCT (DCT-III) 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