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From: Eric <Yonli.Zhan@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: How to compute the Normal of a curve at some points?
Date: Sun, 20 Jul 2008 08:24:27 -0700 (PDT)
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A closed curve consist of a series of points. so how can I get the
Normal of each point in this curve? Thanks very much!

I got this curve by contourc.