@Petros Xanthopoulos: Ok, how to obtain the coefficient matrix of the wavelet packet decomposition,

I only have this code:

load chess

T = wpdec2 (X, 2, 'haar')

I couldn't obtain the matrix of the coefficient

@Aparna Murthy: I need to do it by code for other purposes.

Thank you,

It's probably way too late now, but I just stumpled upon the same problem. One may use the "read" function, to get the data.

t = wpdec2(M, 'wname');

img = read( t, 'data');

(you need to reshape the img, because it's going to be a vector)

see also: http://de.mathworks.com/help/wavelet/ref/read.html

You may also use "wpcoef"-function to get data from a certain node. E.g.:

img = wpcoef( t, [1,0])

Use "plot( t )" to see each node.