Write a function called integerize that takes as its input a matrix A of non-negative integers of type double, and returns the name of the “smallest” unsigned integer class to which A can be accurately converted. If no such class exists, the string 'NONE' is returned. For example, if the largest element of A is 14, then the function would return 'uint8', but if the largest integer in A is 1e20, then the function would return 'NONE'.

function c = integerize(A)
%Input matrix A of non-negative integers
%Output c is smallest unsigned integer class
%Example: A = 256
%         c = integerize(A)
s = max(A(:)); %maximum element of A
if s>=0 && s< 2^8
    c = 'uint8';
elseif s>=0 && s< 2^16
    c = 'uint16';
elseif s>=0 && s< 2^32
    c = 'uint32';
elseif s>=0 && s< 2^64
    c = 'uint64';
else
    c = 'NONE';
end