Re: Beginner Question
- To: mathgroup at smc.vnet.net
- Subject: [mg66583] Re: Beginner Question
- From: "J Siehler" <jsiehler at gmail.com>
- Date: Sun, 21 May 2006 00:29:19 -0400 (EDT)
- References: <e4mmb8$6iu$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Sign[Det[{c - a, b - a}]]
will return +1 or -1 according as C on the right or left of the ray
from A to B. (And 0 if C is colinear with A and B).