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From: "Phil Goddard" <philNOSPAM@goddardconsulting.ca>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Matlab outputing wrong transfer function?
Date: Mon, 19 Oct 2009 19:40:19 +0000 (UTC)
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Open the derivative block and press the Help button to read the doc.
It explains why the derivative is zero, and has links to several topics related to why you should avoid using derivative blocks and how you may be able to change your model to avoid them.

Phil.