Hi Abu, Your statements only seem to make sense if you have another point you want to use as reference. I.e. you have a plane through (x0,y0,z0), (x1,y1,z1) and (x2,y2,z2) and you want to calculate the angle between that plane and a plane through (x3,y3,z3), (x1,y1,z1) and (x2,y2,z2). The way you describe it, there's nothing much to rotate about the line (x2-x1,y2-y1,z2-z1). Please think carefully about what you want to do and how you can get these thoughts across to others.
Best, Tsjerk On 10/1/07, Duncan Murdoch <[EMAIL PROTECTED]> wrote: > > On 10/1/2007 1:27 PM, Abu Naser wrote: > > Hi Duncan, > > > > Let me explain again about what I want to do. > > > > I have a three coordinates (x1,y1,z1),(x2,y2,z2), and (x3,y3,z3). I want > to use (x1,y1,z1) > > and (x2,y2,z2) for defining axis of rotation > > Okay so far: the axis is (x1-x2, y1-y2, z1-z2). > > > > and then calculate the angle of rotation of a line from (x1,y1,z1) and > (x3,y3,z3) around that axis of rotation. > > This part does not make geometric sense to me. Lines don't have an > angle of rotation around an axis of rotation. Lines may form angles > with other lines if they intersect (and I assume these two lines > intersect at (x1, y1, z1)), but those have nothing to do with rotations. > > > Is it possible using your library? > > It sounds as though we are thinking about very different things, so I > would guess not. > > > Or please advise me how to get the solution? > > I don't understand your problem well enough to give any useful advice. > > Duncan Murdoch > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Tsjerk A. Wassenaar, Ph.D. Junior UD (post-doc) Biomolecular NMR, Bijvoet Center Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands P: +31-30-2539931 F: +31-30-2537623 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
