find peak to peak amplitude of an emg signal in matlab

main.m
% compute peak-to-peak amplitude
amplitude = peak2peak(emg_signal)

% plot the EMG signal and mark the peaks
figure;
plot(emg_signal);
hold on;
[~,locs] = findpeaks(emg_signal);
plot(locs, emg_signal(locs), 'rv', 'MarkerFaceColor', 'r');
[~,locs] = findpeaks(-emg_signal);
plot(locs, emg_signal(locs), 'g^', 'MarkerFaceColor', 'g');
hold off;
legend('EMG signal', 'Positive peaks', 'Negative peaks');
xlabel('Sample index');
ylabel('Amplitude (V)');
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