Question

I have set of points (matrix Nx1) and groups for this points (matrix Nx1). I want to plot this points (there is no problem, I do this like this: plot(points, groups, 'o');), but I’d like to set unique color for each group. How can I do this? Now I have only two groups (1,2).

Answer 1

Use logical indexing to select the points you want

figure;
hold all; % keep old plots and cycle through colors

ind = (groups == 1); % select all points where groups is 1

% you can do all kind of logical selections here:
% ind = (groups < 5)

plot(points(ind), groups(ind), 'o');