Create a vector with binary values {0,1} with certain percentage of 0's and 1's

Hi all,

It may be a pretty simple question for many, but I cannot figure out the answer.

I am developing a simualtion in which 1 denotes device ON and 0 denotes OFF. My simulation has x% ON devices (and of course (1-x) % OFF devices).

So, device 1 is denoted by element 1, dev. 2 by element 2 and so on...

In my simulation, I am working in vector mode (I avoid loops).

How can I generate vector of Zeros and Ones (0,1) in which x% elements are 1, rest are 0.

I need something like this (randomly generated in each simulation run)

[1 1 1 0 1 1 0 0 1 0 1 1 0 0 1]

1 => Dev ON

0 => Dev OFF

Answer 1

[KSSV]

N = 10 ;   % total numner of elements 
O = 6 ;    % Number of 1 needed 
F = N-O ;  % Number of 0

O = ones(1,O) ; 
F = zeros(1,F) ;
T = [O F] ; 
idx = randperm(N) ;  % randomise the indices 
T = T(idx) 

[KSSV]

Alternative a code with less steps:

N = 10 ;   % total numner of elements 
O = 6 ;    % Number of 1 needed 
T = zeros(1,N) ; 
idx = randperm(N,O) ; 
T(idx) = 1