To get started, select "matlab help" from the Help menu. >> W=tf

To get started, select "MATLAB Help" from the Help menu.

>> W=tf([-2 -8],[2 0 4 3 3]);
>> W=tf([-2 -8],[2 0 4 3 3]);
>> W=tf([-2 -8],[2 0 4 3 3])
Transfer function:
-2 s - 8
-----------------------
2 s^4 + 4 s^2 + 3 s + 3
>> pole(W)

ans =

0.4771 + 1.4190i
0.4771 - 1.4190i
-0.4771 + 0.6646i
-0.4771 - 0.6646i

>> zero(W)

ans =

-4

>> step(W)

>> impulse(W)
>>
>> bode(W)
>> nyquist
Here is an example of how the function nyquist works:
Consider a randomly generated stable Transfer Function Model:
of the form G(s)=num(s)/den(s):

num =

0 0 -0.0376 0.0896 -0.0533

den =

1.0000 2.9737 2.8217 0.9142 0.0908

Call nyquist using the following command (see also, help nyquist):

nyquist(tf(num,den));
>> nyquist(W)
>> ltiview
>> ltiview(W)
>>