Re: Curl and Div problems
- To: mathgroup at smc.vnet.net
- Subject: [mg115526] Re: Curl and Div problems
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 13 Jan 2011 03:29:18 -0500 (EST)
Use the defined coordinate system
Needs["VectorAnalysis`"]
sub = Thread[{x, y, z} -> Coordinates[]]
{x -> Xx, y -> Yy, z -> Zz}
D[x^2 y, x] + D[x z, y] + D[x^2 y^3, z]
2 x y
Div[{x^2 y, x z, x^2 y^3} /. sub] /. (Reverse /@ sub)
2 x y
Div[{Xx^2 Yy, Xx Zz, Xx^2 Yy^3}]
2 Xx Yy
Curl[{x^2 y, x z, x^2 y^3} /. sub] /. (Reverse /@ sub)
{-x + 3*x^2*y^2, -2*x*y^3, -x^2 + z}
Curl[{Xx^2 Yy, Xx Zz, Xx^2 Yy^3}]
{-Xx + 3*Xx^2*Yy^2, -2*Xx*Yy^3, -Xx^2 + Zz}
Bob Hanlon
---- 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?