How to find valley amplitude position of individual signals?
4 次查看(过去 30 天)
显示 更早的评论
hey guys, In the given picture(consider only the upper subplot), is it possible to find the position of maximum negative peak for every signal out there? please help me asap!
0 个评论
采纳的回答
Star Strider
2017-4-21
I would use the findpeaks function on the negative of each signal. So the negative peaks would be:
[pks,locidx] = findpeaks(-signal); % Peaks & Peak Indices In Vector
pks = -pks; % Correct Amplitudes Of Peaks
2 个评论
Star Strider
2017-4-22
Yes, you can plot both peaks at the same time. You need two different calls to findpeaks, one to find the positive peaks (the ‘usual’ way), and one to find the negative peaks (negating the argument first, then negating the result). Then, use the hold command to do the plotting.
Example —
[pos_pks,pos_loc] = findpeaks(signal,x);
[neg_pks,neg_loc] = findpeaks(-signal,x);
figure(1)
plot(x, signal, '-b')
hold on
plot(pos_loc, pos_pks, '^r')
plot(neg_loc, -neg_pks, 'vg')
hold off
grid
legend('Data', 'Peaks', 'Valleys')
NOTE — This is UNTESTED CODE. It should work.
更多回答(0 个)
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!