Path: news.mathworks.com!not-for-mail
From: "baris kazar" <mbkazar.nospam@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Angle between two vectors
Date: Fri, 28 Dec 2007 18:50:50 +0000 (UTC)
Organization: The MathWorks, Inc.
Lines: 38
Message-ID: <fl3gi9$k22$1@fred.mathworks.com>
References: <ef5ce9c.-1@webcrossing.raydaftYaTP> <fjj9nj$fia$1@fred.mathworks.com> <fjk0tg$jli$1@fred.mathworks.com> <fl377q$4ip$1@fred.mathworks.com> <fl3eu1$d3$1@fred.mathworks.com>
Reply-To: "baris kazar" <mbkazar.nospam@gmail.com>
NNTP-Posting-Host: webapp-05-blr.mathworks.com
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Trace: fred.mathworks.com 1198867850 20546 172.30.248.35 (28 Dec 2007 18:50:50 GMT)
X-Complaints-To: news@mathworks.com
NNTP-Posting-Date: Fri, 28 Dec 2007 18:50:50 +0000 (UTC)
X-Newsreader: MATLAB Central Newsreader 1223357
Xref: news.mathworks.com comp.soft-sys.matlab:443734


"Bruno Luong" <b.luong@fogale.fr> wrote in message <fl3eu1
$d3$1@fred.mathworks.com>...
> "baris kazar" <mbkazar.nospam@gmail.com> wrote in message
> <fl377q$4ip$1@fred.mathworks.com>...
> 
> > 
> > Hi,-
> >  how can we generalize this to 3-D vectors? Think of a 
> > plane on 3-D space and you have vectors on this plane. 
I 
> > wanna know the angle between 2 vectors in the range 0-
2pi.
> 
> The problem is depends on where you look (from above or 
from
> below the plane), you will see the angle between vectors 
on
> this plane reverse the sign (draw them on a transparent
> glass and try to look from both sides). In 3D there is
> nothing that could tell us whereas looking from one way 
or
> from another is more "correct".
> 
> Think like a fish or a bird, not like a man.
> 
> Bruno
> 

Hi Bruno,
 Thanks, but i partially dont agree with you. If you 
choose a reference of point which the start point of the 
first vector, it is not important for me whether you look 
from above or below the plane. I need relative positions 
but not the absolute positions. I think i indicated this 
above.
Anyways, if someone comes up with an idea, please post 
here. I am very curious about a solution.
Best regards