Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
---------------------------------------------------
phone #1:  (+46/0) 708 - 70 73 92
phone #2: (+46/0) 704 - 79 96 95
url: http://konrads.webbsida.com
e-mail: chamsterkonrad at bigfoot.com
-----------------------------------

Sleep - thing used by ineffective people
            as a substitute for coffee

Ambition - a poor excuse for not having
                 enough sence to be lazy
---------------------------------------------------








  • Prev by Date: NDelayDSolve, Dynapac, and delayed dif eqs
  • Next by Date: Re: Re: Limits: Is there something I'm missing Here?
  • Previous by thread: NDelayDSolve, Dynapac, and delayed dif eqs
  • Next by thread: Porting Mathematica graphics to MicroSoft Point, with quality