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

Gabor Grothendieck ggrothendieck at myway.com
Sat Jul 3 03:20:40 CEST 2004

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:


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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