w=tf([2], [1 0])
 w1=tf([20], [1 0])
 bode(w,w1)
 
 w=tf([2 0], [1])
 w1=tf([20 0], [1])
 bode(w,w1)
 
 w=tf([2], [1])
 w1=tf([20], [1])
 bode(w,w1)
 
 w=tf([2], [0.1 1])
 w1=tf([20], [0.1 1])
 w2=tf([2], [1 1])
 bode(w,w1,w2)
 
 w=tf([2], [0.04 0.05 1])
 w1=tf([20], [0.04 0.05 1])
 w2=tf([2], [0.4 0.05 1])
 w3=tf([2], [0.04 0.5 1])
 bode(w,w1,w2,w3)
 
 w=tf([2], [0.1 0 1])
 w1=tf([20], [0.1 0 1])
 w2=tf([2], [1 0 1])
 bode(w,w1,w2)
 
 w=tf([2], [0.1 1 0])
 w1=tf([20], [0.1 1 0])
 w2=tf([2], [1 1 0])
 bode(w,w1,w2)
 
 w=tf([2 0], [0.1 1])
 w1=tf([20 0], [0.1 1])
 w2=tf([2], [1 1])
  bode(w,w1,w2)
  
 w=tf([0.2 2], [1])
 w1=tf([0.5 5], [1])
 w2=tf([1 2], [1])
 bode(w,w1,w2)
 
 w=tf([0.2 2], [1 0])
 w1=tf([0.5 5], [1 0])
 w2=tf([1 2], [1 0])
 bode(w,w1,w2)