How can I change color when multiple dot are superimposed

Question

Jonathan Poirier 2015-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/183035-how-can-i-change-color-when-multiple-dot-are-superimposed

编辑： Jonathan Poirier 2015-3-16

I have a graph with multiple point. I want to change color when 2 points are superimposed. By exemple, when 2 points are superimposed, the color of the resulting is pale blue. 3 points at same place, color is blue, 5 points yellow, 10=red etc.

with few points it would be easy to make a loop to check but I have a 64 X 120 matrix (y-axis) and a vector X 64

Thank

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Answer 1

Image Analyst 2015-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/183035-how-can-i-change-color-when-multiple-dot-are-superimposed#answer_171253

Just plot the sum of y horizontally vs. x.

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Image Analyst 2015-3-15

Well maybe I'm thinking of your array wrong then. Why don't you first read this and then give a small example to show what the x and y values are and what colors you think they should be?

Jonathan Poirier 2015-3-16

编辑：Jonathan Poirier 2015-3-16

在 MATLAB Online 中打开

Ok, I attach an exemple with a . mat file and a figure. The . mat is only one figure. I do a for loop with a hold on to view the plot: Exemple

 figure;
hold on;
evt=14;
angle=[0:63]*(360/63);
for n = 1:evt% Number of event
    Mat=randn(120,64); %randn just for the exemple
    plot (angle,Mat(n),'r.');
end;