detcoef (Wavelet Toolbox)

Extract 1-D detail coefficients.

D = detcoef(C,L,N)
D = detcoef(C,L)

Description

detcoef is a one-dimensional wavelet analysis function.

D = detcoef(C,L,N) extracts the detail coefficients at level N from the wavelet decomposition structure [C,L] (see wavedec). Level N must be an integer such that 1 <= N <= length(L)-2.

D = detcoef(C,L) extracts the detail coefficients at last level

 
n=length(L)-2

Examples

% Load original one-dimensional signal. 
    load leleccum; 
    s = leleccum(1:3920); 
    ls = length(s); 

% Perform decomposition at level 3 of s using db1. 
    [c,l] = wavedec(s,3,'db1');

% Extract detail coefficients at levels 
% 1, 2 and 3, from wavelet decomposition 
% structure [c,l]. 
    cd3 = detcoef(c,l,3); 
    cd2 = detcoef(c,l,2); 
    cd1 = detcoef(c,l,1);