toufig08.m

老外写的小波变换的工具箱

% toufig08 -- Tour Figure 08: Root-Density example
%  1. take a random sample from a mixture of 3 Gaussians
%  2. Bin the data, obtaining counts
%  3. Take an appropriate square root transform of the counts
%  4. Apply Wavelet Shrinkage to the root-counts
%    
	N = 1024;
	z = zeros(1,N);
	z = WhiteNoise(z);
	u = zeros(1,N);
	% rand('uniform');
	u = rand(size(u));
	z(u < .3) = 1 + z(u < .3) ./ 5;
	z(u >= .3) = 1.6 + z(u >= .3) ./ 7;
	z(u >= .8) = z( u >= .8) + .6;
%   2.  make rootogram
	[t,r] = rootogram(z,256);
%   3.  standardize
	y = 2.*r;
%   4.  wavelet shrinkage 
	QMF_Filter = MakeONFilter('Symmlet',8);
	[xh,wcoef] = WaveShrink(y,'Visu',4,QMF_Filter);
%   5.  plot
% 	clf; 
	subplot(211); plot(t,r); title('8 (a) Rootogram')
	subplot(212); plot(t,xh); title('8 (b) Wavelet Smoothed')

 
%  Revision History
%             10/1/05     AM     Changing the name of the variable QMF
   
    
 
 
%
%  Part of Wavelab Version 850
%  Built Tue Jan  3 13:20:42 EST 2006
%  This is Copyrighted Material
%  For Copying permissions see COPYING.m
%  Comments? e-mail [e-mail]