Interesting Programming Errors

1. The array "odd_values" may be the same length as "even_values", or it may be 1 less. If it is shorter, we need to append a zero to make them the same size.
   % Make sure arrays are same length
   if (length(odd_values) < length(even_values))
      odd_values(length(odd_values+1)) = 0;
   end
   After running the above, we get an error because odd_values is STILL 1 value short of even_values. Here is the fix:
   % Make sure arrays are same length
   if (length(odd_values) < length(even_values))
      odd_values(length(odd_values)+1) = 0;
   end
   It adds 1 to the length, instead of adding 1 to each value of "odd_values".
2. This code is supposed to calculate interest, but the amount to repay gets out-of-control.
   x = 0.0639; % interest
   n = 10;
   principal = 165000;
   monthly_payment = 1031.00;
   for yr=1:30
      for mo=1:12
        for i=1:n
          compound = compound*(1+ x/(n*12));
        end
        disp(sprintf('%10.2f', compound));
        % every month, we deduct the payment
        compount = compound - monthly_payment;
      end
   end
   The problem? That should be "compound = compound - monthly_payment;".