Pole Zero Plot of Transfer Fucntion H(z)
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I am having a transfer function H(z)
H(z)= ((z-1)(z-1)(z-2))/(z.z.z)
How can i have its pole zero map
i know abt pzmap but it is for continuous
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moonman
le 10 Nov 2011
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Carla
le 10 Nov 2011
Yes, this will work, and pzmap works fine on discrete-time models.
Your h here is not the same as the transfer function in your original post, though, which you could create with:
H = zpk([1,1,2],[0,0,0],1,0.1)
(using 0.1 for sampling time since you used 0.1 to define h)
Honglei Chen
le 10 Nov 2011
You can use zplane, you can specify either the zero/pole directly or the coefficients. For example, using your equation, you can do either
zplane([1;1;2],[0; 0; 0])
or
zplane(conv(conv([1 -1],[1 -1]),[1 -2]),[1 0 0 0])
See documentation for details
doc zplane
HTH
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