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Problems evaluating Grad

• To: mathgroup at smc.vnet.net
• Subject: [mg39372] Problems evaluating Grad
• From: "Konrad Den Ende" <chamsterkonrad at bigfoot.com>
• Date: Thu, 13 Feb 2003 04:52:09 -0500 (EST)
• Organization: Gothenburg University
• Sender: owner-wri-mathgroup at wolfram.com

I'd like to detrmine Grad to a function so i go:
<<Calculus`VectorAnalysis`
f[x_,y_]:=x+y

Grad[f[a,b]]

I get no errors, but the answer is simply the same thing
that i asked, as if no computation was done. What do i
do wrong?

Also - when i evaluated the examples in Help i got the same
behavior. The answer that already is there gets exchanged
to something else upon my evaluation. Namely, the question
itself. What is that?!

--

Vänligen
Konrad
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• Follow-Ups:
  • Re: Problems evaluating Grad
    • From: Murray Eisenberg <murraye@attbi.com>
  • Re: Problems evaluating Grad
    • From: Kirk Reinholtz <kirk.reinholtz@jpl.nasa.gov>