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Class ChaosDemos.powerSpectrum 

java.lang.Object
   |
   +----ChaosDemos.powerSpectrum
public class powerSpectrum
extends Object
Calculates power spectrum using FFTs and accumulates spectrum.
Uses routines from Numerical Recipes

Version:
26 July 1997
Author:
Michael Cross

Constructor Index

o powerSpectrum(int, int, double)
Constructor

Method Index

o getNumberOfSpectra()
Number of spectra calculated
o setFloor(double)
Set floor for log functio
o transform(double[])
Transforms data and updates spectrum

Constructors

o powerSpectrum 
 public powerSpectrum(int in_nn,
                      int in_winNum,
                      double in_scale)
Constructor

Parameters:
in_nn - number of data points : must be power of 2!
in_winNum - window for FFT: 1=BARTLETT 2=WELCH 3=HANN other=NONE
in_scale - scale factor to convert from index to frequency

Methods

o transform 
 public void transform(double x[])
Transforms data and updates spectrum

Parameters:
x - array of length 2*in_nn containing time sequence of real and imaginary data.
On output x contains spectrum in format suitable for direct plotting in graph2D in first in_nn positions.
o getNumberOfSpectra 
 public int getNumberOfSpectra()
Number of spectra calculated

Returns:
number of spectra
o setFloor 
 public void setFloor(double input)
Set floor for log functio

Parameters:
floor - value of floor 
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