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easy plane normal vector question

• To: mathgroup at smc.vnet.net
• Subject: [mg89690] easy plane normal vector question
• From: will parr <willpowers69 at hotmail.com>
• Date: Wed, 18 Jun 2008 04:24:06 -0400 (EDT)

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

• Follow-Ups:
  • Re: easy plane normal vector question
    • From: "Szabolcs HorvÃt" <szhorvat@gmail.com>