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? > >