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

[Gabor Grothendieck]

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