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Finding peaks in a data set

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Christopher
Christopher on 23 Oct 2013
Edited: Wayne King on 23 Oct 2013
Hello all,
I have some data and need a way to reliablly find the peaks of the data set. The picture below shows the plotted data. There are 19 peaks on each side of the data for a total of 38 peaks. I have tried using the findpeaks function, however it seems to pick up random spots in the data. I am consisently trying to find all 38 peaks.
Thanks

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Image Analyst
Image Analyst on 23 Oct 2013
By the way, you can simply just hit alt-PrintScreen (to copy the active window into the clipboard) and then go to http://snag.gy and type control-V to paste in the screenshot. You don't actually have to take a picture with a camera and then upload it.
Azzi Abdelmalek
Azzi Abdelmalek on 23 Oct 2013
How many peaks did you find with findpeaks ?
dpb
dpb on 23 Oct 2013
And, I suppose while we're asking, what options did you use/have you tried to rid the spurious peaks from the results???? findpeaks does have quite a lot of flexibility in what it thinks is a qualifying peak depending on the inputs given.

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Answers (1)

Wayne King
Wayne King on 23 Oct 2013
Edited: Wayne King on 23 Oct 2013
I would first ensure you are using MathWorks' findpeaks(). If you enter
>>which findpeaks
do you get something back like
matlab\toolbox\signal\signal\findpeaks.m
If so, then as dpb suggests, I would use one or more of the options in findpeaks() like
'MinPeakHeight',MPH
for example.

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