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Re: easy plane normal vector question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89712] Re: easy plane normal vector question
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 18 Jun 2008 06:41:48 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <g3agp3$pjo$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

{a,b}/Sqrt[a^2+b^2]

should be the normal vector.

Regards
   Jens

will parr wrote:
> Dear Math Forum,
> 
> sorry but i'm not very good at vector maths, so this is probably a very easy question:
> 
> if i have the equation for a plane in the form:
> 
> plane = c + ax + by
> 
> (for example plane=4.07919+ 0.0764884 x - 0.0632675 y)
> 
> as you get if you use the Fit function to fit some 3D data (data) in the following way:
> 
> Fit[data,{1, x, y},{x, y}],
> 
> How do i calculate the normal vector to this plane?
> 
> best wishes,
> 
> Will
> 


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