home *** CD-ROM | disk | FTP | other *** search
- Path: comma.rhein.de!yaps!arno
- From: arno@yaps.rhein.de (Arno Eigenwillig)
- Newsgroups: comp.lang.pascal.borland,comp.lang.pascal.mac,comp.lang.pascal.ansi-iso,comp.lang.pascal.misc,comp.sys.amiga.programmer,comp.graphics.algorithms,comp.os.ms-windows.programmer.graphics,comp.sys.amiga.graphics
- Subject: Re: 3d programming
- Message-ID: <SX27y*7Yf@yaps.rhein.de>
- Date: Mon, 19 Feb 1996 12:32:54 +0100
- FollowUp-To: poster
- References: <4f3od9$2jg@zeus.tcp.co.uk> <jderrick-0502961551360001@slip037.csc.cuhk.hk>
- <3118310E.52F@psu.edu> <4fiuh2$qrj@fulton.cs.unc.edu> <311E38D7.71BC@psu.edu>
- <4frlln$lp5@dfw.nkn.net> <Pine.OSF.3.91.960214142740.20349A-100000@curtis.aa.washington.e
- <4g2vue$3s9@mckinley.cit.macalstr.edu> <4g8b5i$irm@dfw.nkn.net>
- Organization: Yet Another Private Site in Meckenheim, Germany
- X-Copyright: This article may not be distributed on a CD-ROM
- or in printed form without prior written consent of the author.
- X-Newsreader: Arn V 1.04
-
- In article <4g8b5i$irm@dfw.nkn.net>, TheAnalyst@Nfo.Org writes:
-
- > > In math, a vector is any ordered pair, triple, n-tuple.
-
- Semi-correct. A vector is an element of an algebraic structure (i.e. a
- set and certain operations defined on its elements), but this is a
- minor point.
-
- > VECTOR: Quantity having both magnitude (size) and direction.
-
- This is *one* out of many possible interpretations. Neither is every
- vector one that carries a geometric meaning (which would allow for
- terms like direction to be applied), nor is every quantity with "both
- magnitude and direction" a vector - it could as well be expressed by a
- pair of length and angle (describing the quantity in polar coordi-
- nates).
-
- Admittedly, the distinction is fuzzy, because describing geometric
- problems is the most important application for vector math, and vector
- math is used most times to deal with geometric problems, but if you
- want to nit-pick, do it correctly. (Typically of someone apparenty
- involved with physics not do get his mathematics straight.)
-
- Lit.ref.: Kowalsky, "Lineare Algebra", 9th Edition, de Gruyter, 1979
-
- -- __
- __/// Arno Eigenwillig /\ <arno@yaps.rhein.de> \/ PGP key available.
- \XX/ V+49-2225-5870 /\ <Arnooo @ #amigager> \/ MIME 8bit welcome.
- :-( Reduced net.presence until June 1996. )-:
-