How to find common peak and save it location

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Phudit Kanittasut
评论： Mathieu NOE 2021-4-8
How can I fine common peak? Ex. When I have 2 data that data 1 have peak at X axis location at 3 ,4 ,5 ,6 ,7 and data 2 at 1 , 4 ,6 , 8 ,10 , so the common peak is at 4 , 6 , but if I dont know where the common peak occur , how can I find the data that occur at the same X coordinate .
clear
pure_brain = readmatrix('Pure Brain Spectra.csv');
[pks,locsBr] = findpeaks(pure_brain(:,2));
LvBrain = pure_brain(locsBr,2)>0; % Set Threshold = 1E+4
xBrain = 1:size(pure_brain,1);
YBrain = pure_brain(locsBr(LvBrain),2);
YBrain = YBrain .* 100/max(YBrain);
[pks_min,pks_max] = bounds(pks); % Minimum & Maximum Values Of pks
figure
pure_Liver = readmatrix('Pure Liver Spectra.csv');
[pks,locsLiv] = findpeaks(pure_Liver(:,2));
LvLiver = pure_Liver(locsLiv,2)>0; % Set Threshold = 1E+4
xLiver = 1:size(pure_Liver,1);
YLiver = pure_Liver(locsLiv(LvLiver),2);
YLiver = YLiver .* 100/max(YLiver);
plot(xBrain(locsLiv(LvBrain)), YBrain, '.r')
hold on
plot(xLiver(locsLiv(LvLiver)), YLiver, '.b')
hold off
grid
% To find common peaks considering the threshold of 1E+4:
lB = locsBr(LvBrain);
lL = locsLiv(LvLiver);
s = max(length(lB), length(lL));
locsLivNew = [lL; false(s-length(lL),1)];
locsBrNew = [lB; false(s-length(lB),1)];
common = locsLivNew == locsBrNew; % Find the common location of peaks
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Image Analyst
Image Analyst 2021-4-8
If you're up for it, Mathieu, just define one as a variable and continue on with the solution
windowWidth = 15; % whatever....
% Now code to call findpeaks() and find out which peaks
% are within windowWidth of peaks in other signal....
Then he can change the number to whatever he wants.
Mathieu NOE
Mathieu NOE 2021-4-8
@Image Analyst
thank you for the tip, but I'd like to see first the OP clarify his needs - have to work a bit for my company sometimes !

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回答（1 个）

Image Analyst
Image Analyst 2021-4-8
Try experimenting around with ismember().

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