wpcoef
Purpose
Wavelet packet coefficients
Syntax
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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