s=tf('s')
 
Transfer function:
s
 
D=1000

D =

        1000

sys=(s-2*pi*2600*i)*(s+2*pi*2600*i)/((s-D-2*pi*2600*i)*(s-D+2*pi*2600*i))
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
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
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
 
Transfer function:
    s^2 + 2.669e08
-----------------------
s^2 - 2000 s + 2.679e08
 
bode(sys)
D=100

D =

   100

sys=(s-2*pi*2600*i)*(s+2*pi*2600*i)/((s-D-2*pi*2600*i)*(s-D+2*pi*2600*i))
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
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
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
 
Transfer function:
    s^2 + 2.669e08
----------------------
s^2 - 200 s + 2.669e08
 
bode(sys)
D=10

D =

    10

sys=(s-2*pi*2600*i)*(s+2*pi*2600*i)/((s-D-2*pi*2600*i)*(s-D+2*pi*2600*i))
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
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
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
 
Transfer function:
   s^2 + 2.669e08
---------------------
s^2 - 20 s + 2.669e08
 
bode(sys)
diary off