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

From: Fred <fzh113_at_hecky.it.northwestern.edu>
Date: Sat 03 Jul 2004 - 06:02:15 EST


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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