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 >