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MathGroup Archive 2005

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Re: Cross results?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63223] Re: Cross results?
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Mon, 19 Dec 2005 07:01:37 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <do3l7r$o0b$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <do3l7r$o0b$1 at smc.vnet.net>,
 Virgil Stokes <virgil.stokes at it.uu.se> wrote:

> I have the following
> 
>   x=.
>   Cross[{10 Sin[x],-10 Cos[x],2.5},{0.12 Sin[x],-0.12 Cos[x], 0.0}]
> 
> which gives,
> 
>   {0.3 Cos[x], 0.3 Sin[x], 0.Cos[x]Sin[x]}
> 
> why does it not set the last term to 0.0?

Mathematica does not automatically simplify expressions such as

  0. x

Use Chop to force the desired simplification.

Cheers,
Paul

_______________________________________________________________________
Paul Abbott                                      Phone:  61 8 6488 2734
School of Physics, M013                            Fax: +61 8 6488 1014
The University of Western Australia         (CRICOS Provider No 00126G)    
AUSTRALIA                               http://physics.uwa.edu.au/~paul


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