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MathGroup Archive 2002

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Re: Curl

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34895] Re: Curl
  • From: Alan Mahoney <mahoney at mpi-magdeburg.mpg.de>
  • Date: Wed, 12 Jun 2002 02:15:23 -0400 (EDT)
  • Organization: Max-Planck-Institut, Magdeburg, Germany
  • References: <ae4f76$9d2$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

You need to put a space between the variable names.  

 Curl[{x z, y z, -y^2}]

{-3 y, x, 0}

John Deacon wrote:
> 
> I must be getting the coordinate system wrong. I want to
> calculate something like curl F where
>  F(x,y,z) = ixz + jyz + ky^2
> where i, j and k are the unit vectors in the x, y and z
> directions respectively.
> 
>         << Calculus`VectorAnalysis`
>         SetCoordinates[Cartesian[x, y, z ]]
>         Curl[{xz, yz, -y^2}]
> produces
>         {-2 y, 0, 0}
> Yet I would swear it should be -3yi + xj
> 
> What am I doing wrong?
> 
> John

-- 
Alan W. Mahoney   				+49-391-6110-286
Max-Planck-Institut für Dynamik komplexer technischer Systeme
Sandtorstrasse 1,   D-39106 Magdeburg,    Germany


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