How to generate 0 and 1 matrix in specific condition.

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Hello everyone. I want to generate a random 4x5 matrix with the elements consist of 0 and 1. But, i don't want each column to have a total amount of 1 that is less than 2. So it's more like:
A =
0 1 1 1 0
1 1 1 1 1
1 1 1 0 1
0 0 1 0 1
I'm okay if there are 2, 3, or 4 total amount of '1' element, but i don't want even a single column to have only one '1' element, or zero at all. How to make it possible? Thank you very much.

Accepted Answer

Matt J
Matt J on 29 May 2021
Edited: Matt J on 29 May 2021
Using the attached file sortlidx,
m=4; n=15;
A=[ones(1,n);randi([0,1],m-1,n)];
[~,idx]=sortlidx(rand(m,n),1);
A=A(idx)
A = 4×15
0 0 1 1 1 0 1 0 0 1 1 1 0 0 1 1 1 1 0 0 1 0 1 1 1 1 1 1 1 0 0 1 1 0 0 1 1 0 1 1 1 1 1 1 1 0 0 1 1 1 1 0 1 1 1 1 0 1 1 1
  1 Comment
Jenjen Ahmad Zaeni
Jenjen Ahmad Zaeni on 29 May 2021
Very good. It can be used for many rows and columns quickly. Thank you very much!

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More Answers (1)

David Hill
David Hill on 28 May 2021
Brute force
a=randi(2,4,5)-1;
while any(sum(a)<2)
a=randi(2,4,5)-1;
end
  1 Comment
Jenjen Ahmad Zaeni
Jenjen Ahmad Zaeni on 28 May 2021
Thank you, it works. But i wonder if i can do this to many more column? Lets say it's 50 and 100 column. Because when i tried to change the column to that amount, it keeps loading all the time.

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