ishitaisha6840 asked . 2020-09-10

How to plot x-y coordinates which correspond to elements which are repeated at least once

My project concerns capture & recapture of rats. I have a 1040 x 3 array, the first column is the tag number of the rat (when each rat is captured for the first time, its given a tag (harmlessly of course!) the other 2 columns are the x & y coordinates respectively of where in a 7x7 plane the rat was captured. If the same rat is captured again, its position is then recorded again. I want to plot how the position of all of the individual rats which were captured more than once change over time. I've got a list of the indices of all of the non-repeated elements (i.e. all the rats which were seen once, but not again), but don't know where to go from there.

plot , matlab , plotting

Expert Answer

Kshitij Singh answered . 2024-12-20 18:09:55

A = 1040x3 array
[r,c] = size(A);
[tags, iA,ic] = unique(A(:,1)); % rats that have been captured
t = 1:r;  % scale time as needed.
rat2 = setdiff(tags,iA); % rats that have been captured more than once
colr = ['b','g','r','m','c','k'];  % identify rats with different colors
figure;
for i=1:length(rat2)
   ind = A(:,1)==A(rat2(i),1);  % pick all the rat locs for rat i
   plot3(t(ind),A(ind,2),A(ind,3),colr(i));  % plot rat i trajectory 
   hold on;
end
grid on;

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