Re: Problem with finding angles between points in Cartesian plane
- To: mathgroup at smc.vnet.net
- Subject: [mg26126] Re: Problem with finding angles between points in Cartesian plane
- From: phbrf at t-online.de (Peter Breitfeld)
- Date: Tue, 28 Nov 2000 01:56:12 -0500 (EST)
- References: <8vfqv9$jif@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Blitzer <drek1976 at yahoo.com> schrieb: > I would like to find the angle between 2 points on the Cartesian plane. > However, if I use "ArcTan", it is not able to recognise that points with the > same x-coordinates have an angle of 90 degrees between them. It returns > "Indeterminate". > eg. for a point A (x1, y1) and a point (x1, y2), to find the angle between > them, I use ArcTan[(y2-y1)/(x1-x1)]. [*** snipp ***] Use ArcTan[(x1-x2),(y1-y2)] Peter -- =--=--=--=--=--=--=--=--=--=--=--=--=--= http://home.t-online.de/home/phbrf Peter Breitfeld, Bad Saulgau, Germany Meinen GnuPG/PGP-5x Key gibts hier