[R] vector normal to a plane

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From: wwsprague@ucdavis.edu
Date: Sat 29 May 2004 - 05:22:22 EST


Message-id: <c983hm$nc0$1@sea.gmane.org>

Hi All,

(I have a degree in math, but I am too embarassed to ask my colleagues,
so here goes:)

I would like to get a vector normal (orthogonal) to a plane formed by
two other vectors. In matlab I do this:

v1 = [.4, .6, .8]; v2 = [.9, .7, .2]; nn = cross(v1,v2) (gives ~[-.48,
.65, -.24]

if I do R> cross(v1, v2), I get .94. Huh?

Thanks for all your help, again.

W

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