MATLAB: Random number gerator problem

Question

The question that i am working on is as follows

Write a function called randomness that takes three input arguments: limit, n, and m, in that order. The function returns an n-by-m matrix of uniformly distributed random integers between 1 and limit inclusive. You are not allowed to use randi, but you can use rand. You will also find the built-in function floor useful for obtaining integers. To make sure that your result is indeed uniformly distributed, test the output of the function by using the built-in function hist, which plots a histogram.

My code is as follows,

function [r] = randomness(limit,n,m)

r= 1+floor(rand(n,m).*(limit-1))

hist(randomness, 1:limit)

end

It keeps giving me an error for the arguments (20,500000,1) and i am not sure why.I have tried using ceil and fix instead of floor, but to little or no avail.

Answer 1

hist(r, 1:limit);

You inadvertently used randomness in your hist call, so MATLAB tried a recursive call with no arguments, hence the error.

You should re-check your algorithm, however, since it currently doesn't produce any values at "limit" and the instructions say "inclusive".