I want to find the corresponding blue and orange peak for the last oscillation.

Hi there,

I have two signals oscillations and I want to find the corresponding blue and orange peak at the last oscillation. The code I am using gives me

the peaks from the start until the end however I only want the peaks that are corresponding in the last oscillation. Can anyone help please?

[pks3,locs3]=findpeaks(signal3,tt2,'MinPeakDistance',2*pi);

[pks4,locs4]=findpeaks(signal4,tt2,'MinPeakDistance',2*pi);

Answer 1

[Star Strider]

Probably:

[pks3,locs3]=findpeaks(signal3,tt2,'MinPeakDistance',2*pi);
[pks4,locs4]=findpeaks(signal4,tt2,'MinPeakDistance',2*pi);
LastBlue = [pks3(end) locs3(end)]
LastOrange = [pks4(end) locs4(end)]

You will need to experiment to see if those return the correct results.

[Newbie]

Thank you for your answer, I tried this already. But this also captures some smaller peaks that are after the highest one in the oscillation. So my end value is not correct.

I want to have the the highest blue and the highest orange in the same cycle.

[Star Strider]

My pleasure.

Add other name-value pairs, specifically 'MinPeakProminence' in order to further define the peaks to identify. I would start with 'MinPeakProminence',1 and then experiment to see what value returns the result you want. (Without the actual data to experiment with, I cannot suggest a specific value, or specific other name-value pair options.)

.

[Image Analyst]

@Newbie, there are lots of options with findpeaks(). Star just mentioned one of them so look into that. Granted, some of them are hard to understand. One you might want tells you how close the peaks can be to each other horizontally. Since you have a rough idea of the main peak spacing, you can set the 'MinPeakDistance' to be around 5 so it won't get a bunch of lesser peaks close by the main peak.

If you still have trouble, attach your data with the paperclip icon.