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java.lang.Objectca.uol.aig.fftpack.RealDoubleFFT_Mixed
ca.uol.aig.fftpack.RealDoubleFFT_Even
cosine FFT transform of a real even sequence.
Field Summary | |
double |
norm_factor
norm_factor can be used to normalize this FFT transform. |
Constructor Summary | |
RealDoubleFFT_Even(int n)
Construct a wavenumber table with size n. |
Method Summary | |
void |
bt(double[] x)
Backward cosine FFT transform. |
void |
ft(double[] x)
Forward cosine FFT transform. |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
public double norm_factor
Constructor Detail |
public RealDoubleFFT_Even(int n)
n
- the size of a real data sequence. When (n-1) is a multiplication of small
numbers (4, 2, 3, 5), this FFT transform is very efficient.Method Detail |
public void ft(double[] x)
x
- an array which contains the sequence to be transformed. After FFT,
x contains the transform coeffients.public void bt(double[] x)
x
- an array which contains the sequence to be transformed. After FFT,
x contains the transform coeffients.
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