Re: Curl and Div problems
- To: mathgroup at smc.vnet.net
- Subject: [mg115533] Re: Curl and Div problems
- From: Gabriel Landi <gtlandi at gmail.com>
- Date: Thu, 13 Jan 2011 03:30:37 -0500 (EST)
You gotta use (Xx,Yy,Zz) as the x,y and z coords in the div.
Div[{Xx^2 Yy, Xx Zz, Xx^2 Yy^3}]
That's how it knows it is the actual (x,y,z) variables.
On Wed, Jan 12, 2011 at 7:07 AM, sean k <seaninsocal 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?
>
>