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Re: Curl and Div problems

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115534] Re: Curl and Div problems
  • From: Sid <pcoords29 at gmail.com>
  • Date: Thu, 13 Jan 2011 03:30:48 -0500 (EST)
  • References: <igjr0p$928$1@smc.vnet.net>

On Jan 12, 1:07 pm, sean k <seaninso... at gmail.com> wrote:
> I'm having problems with VectorAnalysis package.
>
> Within the documentation center, the package loads and works fine.
>
> But in a notebook, it seems to highlight Curl in red and neither Div
> or Curl works properly.
>
> Needs["VectorAnalysis`"]
>
> {D[x^2 y, x] + D[ x z, y] + D[ x^2 y^3, z]}
>
> Div[{x^2 y, x z, x^2 y^3}]
>
> gives different answers.
>
> {2 x y}
> 0
>
> Curl[{x^2 y, x z, x^2 y^3}]
>
> gives
>
> {0,0,0}
>
> I'm on windows vista home edition, 64 bit, Mathematica 8.0.
>
> Does anyone else have this problem?

Hi,

You need to specify the coordinate system.

                            SetCoordinates[Cartesian[x,y,z]]

HTH

Cheers

Sid


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