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Re: Curl and Div problems

  • To: mathgroup at smc.vnet.net
  • Subject: [mg115507] Re: Curl and Div problems
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Thu, 13 Jan 2011 03:25:37 -0500 (EST)

Hi,

how should Mathematica know, that your cartesian coordinates are named
x,y and z? This is one of the first things you can read in the tutorial

VectorAnalysis/tutorial/VectorAnalysis


so what about

In[1]:= Needs["VectorAnalysis`"]
Div[{x^2 y, x z, x^2 y^3}, Cartesian[x, y, z]]

Out[2]= 2 x y

Hope this helps,

Cheers
Patrick

On Wed, 2011-01-12 at 04:07 -0500, sean k 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?
> 
> 



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