How can I change color when multiple dot are superimposed

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

Answer 1

[Image Analyst]

Just plot the sum of y horizontally vs. x.

[Jonathan Poirier]

Ok, I'm not sure if I understand well, How could I know the density of the point like that?

[Image Analyst]

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]

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;

I want to visualize the density of dot in same place to give me someting like the exemple.jpeg in attach