Why isn't the code properly distributing the 1's and 2's in the ratio 3:4 or 4:3?

Why isn't the code distributing the 1's and 2's in the ratio 3:4 or 4:3?

Why is it outputting zeros where it shouldn't (look at highlighted output below)?

clear;
close all;
clc;

N = 4;
K = 14;

M = zeros(N + 2,N + 3);

colNum = 1;
rowNum = N + 2;
i = K * 2;

yellow = 0;
red = 0;

half = (N + 3) / 2 + 1;
counter = 0;

while i ~ 0;
    random = randi(2,1,1);

    if random == 1
        constant = yellow;
    elseif random == 2
        constant = red;
    end
        
    if constant < 4
        if random == 1
            num = 1;
            yellow = yellow + 1;
        elseif random == 2
            num = 2;
            red = red + 1;
        end
        M(rowNum,colNum) = num;
    
    elseif constant > 4
        if random == 1
            num == 2;
            red = red + 1;
        elseif random == 2
            num == 1;
            yellow = yellow + 1;
        end
        M(rowNum,colNum) = num;
    end

    counter = counter + 1;
    counterDev = rem(counter,N + 3);
    
    if counterDev == 0
        rowNum = rowNum - 1;
        yellow = 1;
        red = 1;
    end
    
    if counterDev == 0;
        colNum = 1;
    else
        colNum = colNum + 1;
    end
    
    i = i - 1;
    
end

It is outputting zeros (highlighted below) when it should output a one or two on that spot:

0	 0	0	0	0	0	0
0	 0	0	0	0	0	0
2	 2	2	1	1      *0*     *0*
2	 1	2	2      *0*     *0*     *0*
2	 2	1	1	2	1      *0*
2	 2	1	1	1	1	2

[The Legend]

BUMP

Pleease help ;(

[Mohammad Sami]

It's not clear what you are trying to accomplish.

If you are just trying to randomly assign ones and twos, then perhaps you can do it like this

N = 4
a = rand(N+2,N+3);
i = a<(4/7);
a(i) = 1;
a(~i) = 2;

[Walter Roberson]

If you want a fixed ratio of random values, then create a vector containing the exact number desired of each value, and use randperm() to create a random ordering to apply to the vector.