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MathGroup Archive 2003

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Re: Problems evaluating Grad

  • To: mathgroup at smc.vnet.net
  • Subject: [mg39420] Re: [mg39372] Problems evaluating Grad
  • From: Kirk Reinholtz <kirk.reinholtz at jpl.nasa.gov>
  • Date: Fri, 14 Feb 2003 03:23:54 -0500 (EST)
  • References: <200302130952.EAA20607@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

I'll take a wild guess here: Perhaps you accidently defined a symbol of
some sort that broke Grad somehow.  Perhaps you've got a Grad you
accidently defined in there someplace, or you broke or redefined f[] or
...?

Konrad Den Ende wrote:
> 
> 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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> e-mail: chamsterkonrad at bigfoot.com
> -----------------------------------
> 
> Sleep - thing used by ineffective people
>             as a substitute for coffee
> 
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>                  enough sence to be lazy
> ---------------------------------------------------


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