title: Changing resolution of the nyquist plot
body: <p>I'm trying to check whether the system represented by
  h=tf([1, 1],[1 6 0 0]) is stable by the nyquist criterion. </p>
  
  <p><a href="https://i.stack.imgur.com/z87Fx.png" rel="nofollow noreferrer">but when i put the commend
  'nyquist(h)' at the matlab, i get only this graph</a></p>
  
  <p>clearly it's not the full sketch. how can i change it could see whole of it?
  using the button at the top won't work.</p>