Random Binary Sequence Generator

Question

Sam 2014-2-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/114656-random-binary-sequence-generator

回答： abderrahim rhoulami 2022-9-19

采纳的回答： Wayne King

在 MATLAB Online 中打开

I need to generate a Random Binary Sequence of 1x10000 size. Purely Random 1's and 0's.

I had implemented it as follows and it does the job with no complaints.

rand_bin = round(0.75*rand(1,10000));

However, are there any Efficient Implementations for this, probably a specific function which was built for this or something?

Thanks.

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Roger Stafford 2014-2-3

编辑：Roger Stafford 2014-2-3

I assumed that was what was wanted. Otherwise round(rand(1,10000)) is more efficient.

Sam 2014-2-4

Hi Jos & Roger. Thanks! I didn't realize that the 0.75 was redundant. My idea was to force the random generation to multiply with 0.75 and rounding it but i realize now that it is redundant and forces more 0's..

I agree with Roger's 2nd answer thanks for the clarifications...

Cheers!

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Answer 1

Wayne King 2014-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/114656-random-binary-sequence-generator#answer_123083

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use randi()

x = randi([0 1],10000,1);

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Setsuna Yuuki. 2020-11-19

Muchas gracias :D

Nitin SHrinivas 2021-8-1

If we want to generate all unique coloums or rows is there a function to do so? any suggestions

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Answer 2

Jos (10584) 2014-2-3

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Here are two suggestions:

% with 0 <= P <=1 
RBS = rand(1,N) < P   
% will give roughly a proportion of P ones among N values
% exactly M ones among N values
RBS = false(1,N) ;
RBS(1:M) = true ; 
RBS = RBS(randperm(numel(RBS)

Note: I prefer to store the output as logical arrays (true/false = 1/0) that occupy less memory than double arrays.

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Sam 2014-2-4

Hi. Thanks! it works as well but i implemented the earlier one as i needed a 1 line solution since the rest of my code is quite lengthy.

Jos (10584) 2014-2-6

That's a poor reason to use a one-lined solution ;-)

Long but efficient and readable code is much preferred over short and efficient but unreadable code.

(btw rand(1,N)<P is both short and readable)

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Answer 3

Ayushi Dadhich 2020-11-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/114656-random-binary-sequence-generator#answer_532609

I want a code to generate this output.

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Siddharth Bhalerao 2020-12-28

This space is not for homework/assignments. Ask a specific question. Explain what you have done for the problem you are facing, then ask the question. There are so many experts here, you will definitely get the answers.

Therefore, I will suggest you to update the question and explain the problem clearly.

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