MATLAB: Random number generator

Question

hi…

Can i know how to create a vector with specific number of 1 value? Example i have 5 x 1 matrix, then i want to assign value 1 randomly, but i only want 3 numbers or less of 1's in that matrix..

such as: 1 0 1 1 0

or 0 1 1 0 0

Thanks

Answer 1

Yes you can do it for non repeating randoms. One possible way is which chandra suggested above. But if you want to avoid loops then it is simple. I will generate population of 10 x 15 and. and randomly on each colum 5 values will be zero, other then 1.

population =ones(10,15); % your population
myrand=randperm(10); % random indexes 
population(myrand(1:5),:) = 0; % out 10, each 5 fill be replace. This is total random.