How to use the syntax of Multilevel 1-D wavelet decomposition in for loop ??

Question

afef 2017-7-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/349799-how-to-use-the-syntax-of-multilevel-1-d-wavelet-decomposition-in-for-loop

I have to use the syntax of Multilevel 1-D wavelet decomposition which is

[c,l]=wavedec(x,4,'db4');
[cd1,cd2,cd3,cd4]=detcoef(c,l,[1,2,3,4]);
cA4=appcoef(c,l,'db4',4);

for my multichannel EEG signal which contains 23 derivations so i used a for loop to have simple and short code i tried this :

 Fs=256;
result=cell(23,1);
 d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'PassbandRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
for n=1:23
    deriv=(val(n,:))/2.559375;
    t=(0:length(deriv)-1)/Fs;
    result{n} = filtfilt(d1,deriv);
    moyenne{n}=mean(result{n},2); 
    variance{n} = std(result{n},[], 2);
    Maximale{n}= max(result{n},[],2);
    Minimale{n} =  min(result{n},[],2);
    [c,l]=wavedec(result{n},4,'db4');
    [cd1,cd2,cd3,cd4]=detcoef(c,l,[1,2,3,4]);
    cA4=appcoef(c,l,'db4',4);
    [Ea,Ed]=wenergy(c,l)
    energie{n} = {Ea, Ed};
end
[a,b,z,d,e,f,g,h,i,j,k,ll,m,n,o,p,q,r,s,x,u,v,w]=result{:};

But concerning [c,l] , [cd1,cd2,cd3,cd4] and cA4 i only get the result for one derivation How to correct the code to get the results for all the derivations ?