Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

wpcoef

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');

Introduced before R2006a

Was this topic helpful?