Re: Curl

• To: mathgroup at smc.vnet.net
• Subject: [mg34907] Re: Curl
• From: lalu_bhatt at yahoo.com (Bhuvanesh)
• Date: Wed, 12 Jun 2002 02:15:45 -0400 (EDT)
• References: <ae4f76\$9d2\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```John Deacon <jdeacon at jdl.co.uk> 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

You need a space or a multiplication sign between variables that you
are multiplying (i.e. xz is a single variable, while x*z is
Times[x,z]).

In[1]:= <<Calculus`VectorAnalysis`

In[2]:= SetCoordinates[Cartesian[x, y, z]]

Out[2]= Cartesian[x, y, z]

In[3]:= Curl[{x*z, y*z, -y^2}]

Out[3]= {-3 y, x, 0}

--
Bhuvanesh,
Wolfram Research.

```

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