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Conditional Plots

• To: mathgroup at smc.vnet.net
• Subject: [mg50453] Conditional Plots
• From: m.yeung at ic.ac.uk (matt)
• Date: Sat, 4 Sep 2004 01:43:35 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Dear all,

Í´m trying to produce a 3D plot with a 2D ploygon (within unit circle)
as its base. Equivalently, I want my 3D surface to sit inside (be
bounded by) a cylinder with n-gon cross section. 

How can I trim off the edges?
 I´ve tried to use 
If[ (condition), Plot, Blah] but it doesn´t seem to work.....