Randomly generate a matrix of zeros and ones with a non-uniform bias

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Nurul 2011-2-11

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评论： Jack Nelson 2020-5-13

Can anyone help me to generate a matrix of zeros and ones randomly without uniformly distributing like the function of "randint". Instead with the number of ones must be larger than zeros in an array.

For example, a matrix like this:

A= [ 1 1 1 1 0 1 0, 1 0 1 1 1 1 1, 1 1 0 1 1 0 0]

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Matt Fig 2011-2-11

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Like this?

A = rand(1,21)>.3 % Increase number for less ones, decrease for more.

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Nurul 2011-2-16

Hi Matt, for the time being, i'm using your solution as it could give the ones more than zeros.

Jack Nelson 2020-5-13

Thanks! :)

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Jos (10584) 2011-2-11

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The following gives you a matrix with exactly a certain number of 1's

sizeR = [3 4] ;
num1 = 8 ;
R = zeros(sizeR)  % set all to zero
ix = randperm(numel(R)) % randomize the linear indices
ix = ix(1:num1) % select the first 
R(ix) = 1 % set the corresponding positions to 1

By the way, if the only values in R are 0 and 1 than logical arrays may be worthwhile to explore, as they are less memory consuming than double arrays.

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Nima Mahanfar 2015-6-17

Thanks, this was very helpful. Is there a way to make these ones being adjacent elements? example for 6x3 matrix with two 1's: [1 1 0 0 0 0; 0 0 0 0 0 0; 0 0 0 0 0 0]

Nima Mahanfar 2015-6-17

Thanks, this was very helpful. Is there a way to make these ones being adjacent elements? example for 6x3 matrix with two 1's: [1 1 0 0 0 0; 0 0 0 0 0 0; 0 0 0 0 0 0]

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