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MathGroup Archive 2005

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Re: Cross results?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63209] Re: [mg63201] Cross results?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 19 Dec 2005 07:01:01 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Presumably it is tracking precision.

x=.

Cross[{10 Sin[x],-10 Cos[x],2.5},{0.12 Sin[x],-0.12 Cos[x],0}]

{0.3 cos(x),0.3 sin(x),0. cos(x) sin(x)}

%//Rationalize//N

{0.3 cos(x),0.3 sin(x),0.}


Bob Hanlon

> 
> From: Virgil Stokes <virgil.stokes at it.uu.se>
To: mathgroup at smc.vnet.net
> Date: 2005/12/18 Sun AM 07:34:37 EST
> Subject: [mg63209] [mg63201] Cross results?
> 
> 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?
> 
> 


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