[R] orientlib

Duncan Murdoch murdoch at stats.uwo.ca
Mon Oct 1 18:45:13 CEST 2007

On 10/1/2007 11:09 AM, Abu Naser wrote:
> Hi Duncan,
> Sorry, I forgot to mention. I meant (x1,y1,z1) and (x3,y3,z3).

I'm afraid I still don't understand what angle you are trying to calculate.

Duncan Murdoch

> With regards,
> Abu
> ----------------------------------------> Date: Mon, 1 Oct 2007 10:48:12 -0400> From: murdoch at stats.uwo.ca> To: likhonnaser at hotmail.com> CC: r-help at r-project.org> Subject: Re: [R] orientlib>> On 10/1/2007 9:44 AM, Abu Naser wrote:>> Hi Duncan,>>>> Thanks for your replay.>> I am confused as I dont have the quaternion backgorund.>>>> Let me explain what I am trying to do:>> I have 3 coordinates in space (x1,y1,z1),(x2,y2,z2), and (x3,y3,z3) . Now, I use (x1,y1,z1) and (x2,y2,z2) to define axis of rotaion. Then, I wanted to use 3rd coordinate to calculate angle of rotation about that axis. Is it possible with your orientlib?>> I think you need to be more specific about how the rotation is defined.> Two points define a line in an obvious way, but how does the third point> define an angle?>> Duncan Murdoch
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