Nyquist plot with one zero, four identical poles and one pole at origin. Nyquist plot different from the one I draw by hand!

Hello

I am trying to draw the Nyquist plot of this transfer function

 2 (s+1)
----------
s (s+10)^4

This my code:

NUM2 = [2 2];
DEN2 = [5 40 600 4000 10000 0];
FT2 = tf(NUM2,DEN2) 
fprintf ('\n Nyquist\n')
figure(2)
nyquist(FT2)

This is the result:

This is not what I draw by hand.

What is wrong with my code?

Answer 1

[Walter Roberson]

The leading coefficient on DEN2 should be 1, not 5.

[Nuno Fonteseca]

Thanks! That's was one of the problems.