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From: "hailiang shen" <hlshen2005@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Contour graph help!
Date: Wed, 2 Jul 2008 16:25:04 +0000 (UTC)
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first generate the mesh with 'meshgrid' function, and then 
use the 'contourf' to have the plot. 

of course your z data have to be set the same size as the 
mesh