Once you have done "wavedec" next line : use appcoef ( )

https://www.mathworks.com/help/wavelet/ref/appcoef.html?s_tid=doc_ta

Hello

can this link help ?

https://it.mathworks.com/help/wavelet/ug/r-wave-detection-in-the-ecg.html

Here you can find some useful information: https://uk.mathworks.com/help/wavelet/ug/r-wave-detection-in-the-ecg.html

hi thanks for your answers! Arkadiy Prodeus Mohamed Fezari Aparna Sathya Murthy how to obtain wavelet coefficients? should i use detcoef or appcoef matlab function?

You should use appcoef for approximation coefficient (that is low pass filtered signals after decomposition ) while for detail coefficients use detcoef (which is the high pass filtered coefficients )

After wavedec ( )

Eg: ApprxCoeff = appcoef(c,l,'bior1.5');

Aparna Sathya Murthy but i must obtain wavelet coefficient