diary on
s=tf('s')
 
Transfer function:
s
 
sys=s/((s+1)*(s+1+20i)*(s+1-20i))
Warning: Transfer function has complex coefficients.
> In /mit/matlab_v6.5/distrib/toolbox/control/control/@tf/tf.m at line 197
  In /mit/matlab_v6.5/distrib/toolbox/control/control/@tf/plus.m at line 26
Warning: Transfer function has complex coefficients.
> In /mit/matlab_v6.5/distrib/toolbox/control/control/@tf/tf.m at line 197
  In /mit/matlab_v6.5/distrib/toolbox/control/control/@tf/plus.m at line 26
  In /mit/matlab_v6.5/distrib/toolbox/control/control/@lti/minus.m at line 12
 
Transfer function:
            s
-------------------------
s^3 + 3 s^2 + 403 s + 401
 
bode(sys)
diary off