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From: "Steve " <steveDEL.bachmeierDEL@yahoo.com>
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Subject: symbolic toolbox
Date: Fri, 12 Oct 2007 00:51:38 +0000 (UTC)
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How do you specify what variables are functions of, say
time?  I can't find it in the manual.  So, for example, if I
type

syms x
f=x
diff(x)

The solutions is 1.  But what if x is a function of t?  Then
the solution will be d/dt(x).

Thanks in advance