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An Elegant way of plotting the Pole-Zero diagram

• To: mathgroup at smc.vnet.net
• Subject: [mg88833] An Elegant way of plotting the Pole-Zero diagram
• From: bk2005usa at gmail.com
• Date: Sun, 18 May 2008 07:34:07 -0400 (EDT)

Hi to All:

Would anyone care to provide an elegant way of plotting the pole-zero
diagram of a transfer function H[s], using the conventional symbols,
namely, "x" for poles and "0" for zeros.  Mathematica does not have a
built-in function to draw those symbols---like "Point[] and
PointSize[].
Your help will be appreciated
Lemiel