[]=collatzrange(n,d)

function []=collatzrange(n,d)
% collatzrange(n,d)
% Checks for exceptions to the Collatz conjecture for numbers
% between n and d inclusive.  Returns if an exception is found
% or not.
% Author:  Matt Fig  Montana State University
% Contact:  [e-mail]
h = [n:d];
while any(find(h > 1))
      h(find(h==1)) = 0;
      kk = find(odd(h));
      jj = find(~odd(h));
      h(kk) = 3*h(kk)+1;
      h(jj) = .5*h(jj);
end
h(find(h==0)) = 1;
if any(h-1)
   ff = find(h~=1);  dd = h(ff)
   disp('Its pizza time, exception found. The exception is:')
   fprintf('\n\t\t\t\t\t  %.0f ',dd)
   return
end
sprintf('\n There is no exception in that range, try again.\n') 

function val=odd(jj)
val = rem(jj,2);