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.
