Help with for loops

There is 1 box

50/50 chance for a red ball and green ball in the box to be randomly pulled out.

So the box has an equal number of red and green balls.

My question is, how do i make a loop that picks 3 balls with 50/50 chance (the ball is put back before picking the next ball, so the second and third pick are still 50/50 as well).

Specifically using fprintf to get something like: "2 red balls and 1 green ball was chosen"

I know i used disp(""), but i am a little lost on that part as well

But as of now, I just need my results to output a matrix that says:

[3 0] or [2 1] or [1 2] or [0 3]

%

%

% Here is my noob attempt

ball = rand;

for i = 1:3

    if ball > 0.5

        result1 = [(i+1),i];

    else % ball <= 0.5

        result1 = [i,(i+1)];

    end

end

disp(results)

Answer 1

[Jan]

In result1 = [(i+1),i] you overwrite result1 repeatedly instead of accumulating the results. A solution would be:

result = [];
for i = 1:3
  ...
  result = [result, i];
  ...

But this would not count the red and green balls. Better:

red = 0;
green = 0;
for i = 1:3
  if rand > 0.5  % Inside the loop, not once before the loop
    red = red + 1
    ...

You can either collect the green balls also, or use the fact, that the number of red and green balls must be 3.

Finally fprintf() helps:

fprintf('Red balls: %d\n', red)