can anyone tell me how to find Q and S point of ECG signal using wavelets transform in matlab?

I have R peak Value.

[Jorge Mario Guerra González]

There are couple of peakdetector functions in the file exchanger. Here is one, however I dont think they use the wavelets technique. Check if this is useful for you.

https://www.mathworks.com/matlabcentral/fileexchange/45404-ecg-q-r-s-wave-online-detector