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AW: Problems evaluating Grad

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39401] AW: [mg39372] Problems evaluating Grad
  • From: Matthias.Bode at oppenheim.de
  • Date: Fri, 14 Feb 2003 03:18:11 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello Konrad,

Mathematica 4.1.1, Windows:

In[5]:=
<<Calculus`VectorAnalysis`

In[6]:=
f[x_,y_]:=x+y
Grad[f[a,b]]


Out[6]=
{0,0,0}

I learnt that packages sometimes do not get loaded properly if they are not
called from a separate cell.

Best regards,
Matthias Bode
Sal. Oppenheim jr. & Cie. KGaA
Koenigsberger Strasse 29
D-60487 Frankfurt am Main
GERMANY
Tel.: +49(0)69 71 34 53 80
Mobile: +49(0)172 6 74 95 77
Fax: +49(0)69 71 34 95 380
E-mail: matthias.bode at oppenheim.de
Internet: http://www.oppenheim.de



-----Ursprüngliche Nachricht-----
Von: Konrad Den Ende [mailto:chamsterkonrad at bigfoot.com]
Gesendet: Donnerstag, 13. Februar 2003 10:52
An: mathgroup at smc.vnet.net
Betreff: [mg39372] Problems evaluating Grad


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?!

--

Vnligen
Konrad
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