How can I display all possible combinations of 4 images?

Question

I am trying to explain probability in MatLab to some students and want to first demonstrate probability in real life examples. I have four images, two red balls, one blue and a yellow, all 4 in Matlab as image(1)/(2)/(3) and (4). How can I make 2 by 2 grids and display all possible arrangments of the 4 images?

Thank You!

`figure;subplot(2,2,1);imshow(img1);subplot(2,2,2);imshow(img2);...` — NKN, Apr 21 '17 at 14:25
A simple Google search could have been better before posting. — SKPS, Apr 21 '17 at 14:58

Gelliant · Answer 1 · 2017-04-22T17:04:32.570

That means 4! (=24) arrangements.

%I just generate some images to show the example
images{1}=ones(5,5,3);images{2}=ones(5,5,3);images{2}(:,:,1)=0;
images{3}=ones(5,5,3);images{3}(:,:,2)=0;images{4}=ones(5,5,3);images{4}(:,:,3)=0;
%code starts here
m=[1 1 2 3];
v=perms(m);
%remove doubles
for ct = size(v,1):-1:2
    if any(sum((v(1:ct-1,:)-v(ct,:))==0,2)==4)
        v(ct,:)=[];
    end
end
%plot in 2x2 figure
for ct = 1:size(v,1)
    figure(ct)
    for i = 1:4
        subplot(2,2,i);imagesc(images{v(ct,i)});
    end
end
%to close all images type "close all" in the console

How can I display all possible combinations of 4 images?

1 Answers1