% iterative
function fibo = iterfibo(n)
  if ( n < 2 )
    fibo = n;
  else
    f = zeros(2,1);
    f(1) = 0;
    f(2) = 1;
    for i = 2 : n
      t = f(2);
      f(2) = f(1) + f(2);
      f(1) = t;
    endfor
    fibo = f(2);
  endif
endfunction