Re: [R] How to get the normal direction to a plane?

From: Gabor Grothendieck <ggrothendieck_at_myway.com>
Date: Sat 03 Jul 2004 - 11:20:40 EST

In R^3 there is a unique answer if the points don't all lie on a line. See the discussion a few weeks ago on the list available at this thread:

   http://tolstoy.newcastle.edu.au/R/help/04/05/1487.html

Also you might want to google for

   cross product

Fred <fzh113 <at> hecky.it.northwestern.edu> writes:

:
: Dear All
:
: Maybe the following is a stupid question.
: Assume I have 3 coordinate points (not limited to be in 2D or 3D space)
: a, b, c.
: It is known that these 3 points will define a plane.
: The problem is how to get the normal direction that is orthogonal to
: this plane.
:
: Is there an easy way to calculate it using the values of a, b, and c?
:
: Thanks for any point or help on this.
:
: Fred



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