How to generate 0 and 1 matrix in specific condition.

Question

Jenjen Ahmad Zaeni 2021-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/842305-how-to-generate-0-and-1-matrix-in-specific-condition

评论： Jenjen Ahmad Zaeni 2021-5-29

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 =
   1     1     1     0
   1     1     1     1
   1     1     0     1
   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.

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Answer 1

Matt J 2021-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/842305-how-to-generate-0-and-1-matrix-in-specific-condition#answer_711870

编辑：Matt J 2021-5-29

在 MATLAB Online 中打开

sortlidx.m

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

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Jenjen Ahmad Zaeni 2021-5-29

Very good. It can be used for many rows and columns quickly. Thank you very much!

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Answer 2

David Hill 2021-5-28

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https://ww2.mathworks.cn/matlabcentral/answers/842305-how-to-generate-0-and-1-matrix-in-specific-condition#answer_711465

在 MATLAB Online 中打开

Brute force

a=randi(2,4,5)-1;
while any(sum(a)<2)
    a=randi(2,4,5)-1;
end

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Jenjen Ahmad Zaeni 2021-5-28

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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