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obtaining the maximum values from the series

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Ede gerlderlands
Ede gerlderlands 2013-4-3
关闭： MATLAB Answer Bot 2021-8-20
I have two series of readings (time, x) and (time, y). Both graphs have cyclic nature which respect to time. With peak and trough in random and different time interval. I want to find the the lag between maximum x and maximum y (each peaks) from the series and plot it against time. Can you help with that?

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回答（2 个）

Sean de Wolski
Sean de Wolski 2013-4-3
doc findpeaks
http://www.mathworks.com/help/releases/R2013a/signal/ref/findpeaks.html
The problem with looking for the derivative to be zero is that this will almost never happen with real data unless you are saturating to some level. Instead, look for where the derivative changes sign()
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Ede gerlderlands
Ede gerlderlands 2013-4-3
Yes, I have used this function but couldn't left out the local maximums from the series . Is there any way of avoiding them ?
Sean de Wolski
Sean de Wolski 2013-4-4
Use the threshold option. Or find all of the peaks and then pick the best ones from that.
Image Analyst
Image Analyst 2013-4-4
Like I said in your duplicate question, if you want all the local peaks left out, then just use max() -- this will find the one global max.

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