finding troughs in signal

Hi,

I am doing ECG analysis and i was able to successfully isolate the R peak (the highest peak) , P and T (the lower peaks) with findpeaks() and peak prominence. I now need to find the QS troughs, which are simply the left and right troughs of the R peak. I thought of using the negative of the variable and use findpeaks but that doesn't seem to work... any suggestions?

Answer 1

[KSSV]

Read about findpeaks.

Answer 2

[Star Strider]

See my Answer in: How to find QRS complex for this Graph? for one approach to this problem. You will likely need to modify that code slightly (specifically the 'MinProminence' value, or get the prominences of all the troughs and then threshold or bracket them) to get it to work with your signal.