Random Binary Sequence Generator

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.

[Roger Stafford]

This gives you 1's with probability 1/3 and 0's with probability 2/3. You could also do

 ceil(rand(1,10000)-2/3)

or

 floor(rand(1,10000)+1/3)

for the same probability, but I doubt if these are any more efficient. I doubt if you can improve on these in any significant way.

[Jos (10584)]

Why do you have the factor 0.75 in there? This will give more zeros than ones in the output. Are you sure your need that?

[Roger Stafford]

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

[Sam]

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!

Answer 1

[Wayne King]

use randi()

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

[monika&bouta]

hi, we did the same command but w need to put in polar form. any ideas !!?

[Setsuna Yuuki.]

Muchas gracias :D

[Nitin SHrinivas]

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

Answer 2

[Jos (10584)]

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.

[Sam]

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)]

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)

Answer 3

[Ayushi Dadhich]

I want a code to generate this output.

[Siddharth Bhalerao]

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.

Answer 4

[abderrahim rhoulami]

A=randi([0],50,10): Whos

Answer 5

[abderrahim rhoulami]

A=randi([0 1], 50,10) A