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

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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
  3 Comments
Mohammad Sami
Mohammad Sami on 17 Dec 2019
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
Walter Roberson on 17 Dec 2019
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.

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