How can I plot through a histogram the random number generated by matlab.I want to use just rand function.The output of the function is n*m matrix.

function r = randomness(limit,n,m)
    r=floor(1+limit*rand(n,m));
    % hist(r(1:n*m),1:limit) %%r(:) is sufficient
    % title('Histogram of random numbers')
end

my problem is why hist function is written in that way?

Answer 1

[Image Analyst]

The author did r(1:n*m) to get r into a 1-dimensional row vector. If r had remained a 2-D matrix, then hist, like a lot of MATLAB functions, gives you a hist for every column separately. The author didn't want m histograms, they wanted only one histogram so they make r 1-D. However, this could have been done simpler, and in a more MATLAB-ish manner, by simply doing r(:) as their comment mentioned.

The 1:limit was to specify the centers, and hence the number, of the bins.

Answer 2

[Azzi Abdelmalek]

limit=10
n=4;
m=3;
r=floor(1+limit*rand(n,m))
hist(r(:))