How can I plot coordinates with different colours based on the value and family of my variables ?

How can I associate a colour to a coordinate depending on the family of its highest associated value ?

For example, if my coordinates are X=[2 4 -3 5 6] and Y=[4 9 1 -2 1] and my associated values are L1 (blue) =[1 1 1 1 1], L2 (green) =[2 1 2 1 2], L3 (red) =[3 3 3 3 1] and L4 (purple) =[10 0 2 0 0], I want the coordinate (2,4) to be purple, the coordinate (4,9) to be red, the coordinate (-3 1) to be red and so on.

The main objective is to make a "phase diagram" that tell us which treatment between L1, L2, L3 and L4 is the most optimal (has the highest value) for each point in space.

Answer 1

[Simon]

Hi!

X = [2 4 -3 5 6];
Y = [4 9 1 -2 1];

L1 = [1 1 1 1 1];
L2 = [2 1 2 1 2];
L3 = [3 3 3 3 1];
L4 = [10 0 2 0 0];

% concat all L1 to L4
L = [L1; L2; L3; L4];

% sort columns ascending
[~, ix] = sort(L, 1);

% last row of ix is the L1 to L4 index, we don't need the rest
ix = ix(end, :);

% color specification
col = {[1 0 0], [0 1 0], [0 0 1], [0 0.5 0.8]};

% plot
figure(1); cla; hold on;
for n = 1:length(X)
    plot(X(n), Y(n), 'Color', col{ix(n)}, 'Marker', 'o');
end

You may define your colors as RGB values in the range [0; 1].

[Kevin]

Nice ! Thanks a lot, it works perfectly !