%%%%%%%%%%%%%%%%%%%%%%%%%%%%  Upper Case  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% UPCASE
% Usage: UPCASE(str)
%
% Inputs:  str - a string 
%   
% Output:  changes all lower case letters in str to upper case

function rstr = upcase(str)             
   len = length(str);
   for i = 1:len  
       s = str(i);
       if  (s >= 'a')&(s <='z') s = s-32; end;
       str(i) = s;
       end;
   rstr = str;