how i get wavelet coefficient after 5-level?

i work with ecc signal classification, and i use wavelet transform my signal have 1024 sample and after i make 5-level it should be 32-sample. but i get 5-app and 5-det each one have 1024 sample also , so ,how i get the only 32 sample ( as a feature ) which represent the ecg-signal . thanks,

Answer 1

[Wayne King]

You need to set the dwtmode to periodization

   dwtmode('per');
   x = randn(1024,1);
   [C,L] = wavedec(x,5,'db4');
   % get level-5 wavelet coefficients
   d5 = detcoef(C,L,5);
   length(d5)