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Re: Grad in VectorAnalysis`
*To*: mathgroup at smc.vnet.net
*Subject*: [mg103846] Re: [mg103822] Grad in VectorAnalysis`
*From*: David Bevan <david.bevan at pb.com>
*Date*: Fri, 9 Oct 2009 07:15:39 -0400 (EDT)
*References*: <200910081149.HAA13507@smc.vnet.net>
It looks to me like you haven't defined f[x, y, z].
I think you'll need
f[x_, y_, z_] := ...
You might also want to read up on "=" versus ":=".
David %^>
> -----Original Message-----
> From: Murray Eisenberg [mailto:murray at math.umass.edu]
> Sent: 8 October 2009 12:50
> To: mathgroup at smc.vnet.net
> Subject: [mg103822] Grad in VectorAnalysis`
>
> After...
>
> Needs["VectorAnalysis`"]
> SetCoordinates[Cartesian[x, y, z]]
>
> f[x_, y_] = x/(1 - x^2 - y^2)
>
> ... why does the following not actually return the formula for gradient..=
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