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Re: Problems evaluating Grad

• To: mathgroup at smc.vnet.net
• Subject: [mg39424] Re: Problems evaluating Grad
• From: "Steve Luttrell" <luttrell at _removemefirst_westmal.demon.co.uk>
• Date: Fri, 14 Feb 2003 03:24:16 -0500 (EST)
• References: <b2fpvg$k66$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Evaluate SetCoordinates[Cartesian[a, b, c]] before you evaluate the Grad.

--
Steve Luttrell
West Malvern, UK

"Konrad Den Ende" <chamsterkonrad at bigfoot.com> wrote in message
news:b2fpvg$k66$1 at smc.vnet.net...
> 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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