MATLAB: I have a vector which contain 23 elements.i wanna choose 20 elements among this 23 elements randomly.how can i do this

matlab guide

i have a vector which contain 23 elements.i wanna choose 20 elements among this 23 elements randomly.how can i do this?

A=randi(50,1,23)  
out = A(randperm(23,20))

random_element = v(randi(numel(v)))

I'm sure there is a one-liner that can solve your problem, but here is one option:

Let

A = randi(10,[2500 1]); % 2500x1 vector with all random integers <= 10
B = unique(A);
[~,j] = max(arrayfun(@(x) sum(A==x),B));

Then the value that appears the most in A is given by B(j).