Wavelet Toolbox™

Wavelet packet coefficients

Syntax

• X = wpcoef(T,N)
  X = wpcoef(T)
  

Description

wpcoef is a one- or two-dimensional wavelet packet analysis function.

X = wpcoef(T,N) returns the coefficients associated with the node N of the wavelet packet tree T. If N doesn't exist, X = [ ];

X = wpcoef(T) is equivalent to X = wpcoef(T,0).

Examples

• % The current extension mode is zero-padding (see dwtmode).
  
  % Load signal. 
  load noisdopp; x = noisdopp;
  
  figure(1); subplot(211); 
  plot(x); title('Original signal');
  
  % Decompose x at depth 3 with db1 wavelet packets 
  % using Shannon entropy. 
  wpt = wpdec(x,3,'db1');
  
  % Plot wavelet packet tree wpt. 
  plot(wpt)
  
  
  % Read packet (2,1) coefficients. 
  cfs = wpcoef(wpt,[2 1]);
  
  figure(1); subplot(212); 
  plot(cfs); title('Packet (2,1) coefficients');
  
  
  

See Also
wpdec, wpdec2

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