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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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The Legend
The Legend 2019-12-16
关闭： MATLAB Answer Bot 2021-8-20
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 个评论
显示 1更早的评论
Mohammad Sami
Mohammad Sami 2019-12-17
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 2019-12-17
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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