 function test(n)
 x=[1:n];
 y=[1:n];
 z=[1:n];
 
 
 for i=1:n
  i
  f=[1:2^i];
  tic;
  d=ffTU(f);
  y(i)=toc;
  z(i)= 2^i*log(2^i)/5500;
  x(i)=2^i;
 endfor
 plot(x,y,x,z)
 endfunction
