Q-wave and S-wave amplitude high-frequency waves are usually low, generally located before the Q-wave S-wave, S-wave is located after the R-wave, because they are generally downward wave, so their peak point and the extreme is the corresponding. Dimensionless detected R-wave to the left and right were searched extreme points, the corresponding Q-wave and S-wave is. And now we just need to detect the R-wave, so you do not need to detect extreme point Q wave and the S wave.

ecgprocess.m
ecgsignal.mat

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