Matching two plots to find the number of same peaks in it.

Can you please help to find the coding to relate two plots and find number of same peaks in both the plots.

[Image Analyst]

The answer is "Yes" or at least "probably".

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

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In the meantime, check out my attached demos to fit a specified number of Gaussians to some data.

If you have the Signal Processing Toolbox, also check out findpeaks.

[Jeffrey Clark]

Please check that one of your classmates hasn't already posted the same question. You could then add your name via a comment on that question or by following it: match peaks from plot - (mathworks.com)

Answer 1

[VINAYAK LUHA]

Hi Akash,

It is my understanding that you wish to find the number of same peaks in two plots. This answer assumes that by “same” peak, you mean same x coordinates of the peaks.

You can use the “findpeak” function in “Signal Processing Toolbox” as shown below –

%Generate and plotting data 
y1 = [0,2,0,5,10,10,10,6,15,9]; 
y2 = [18,6,9,4,7,6,0,3,5,4]; 
plot(y1,"color","red"); 
hold on; 
plot(y2,"color","blue"); 

%Finding x and y coordinates of peaks 
[pk1,lc1] = findpeaks(y1,1:10); 
[pk2,lc2]= findpeaks(y2,1:10); 
plot(lc1,pk1,'o','MarkerSize',8,MarkerFaceColor='red'); 
plot(lc2,pk2,'o','MarkerSize',8,MarkerFaceColor="blue"); 

%Plotting peaks 
commonPeakXs = intersect(lc1,lc2); 
commonPeakYs = pk1(ismember(lc1, commonPeakXs)); 
plot(commonPeakXs,commonPeakYs,'o','MarkerSize',12,MarkerEdgeColor="k"); 
hold off 

Next, you can use the “length” function to find the number of common peaks. Here’s a link to the documentation of “findpeaks” function for your reference https://in.mathworks.com/help/signal/ref/findpeaks.html

Hope this helps!

Regards,

Vinayak Luha