CCL: Cartesian Coordinate Transformation

 Sent to CCL by: Michel Petitjean [ptitjean:-:itodys.jussieu.fr]
 To: "CCL Subscribers" <chemistry-,-ccl.net>
 Subject: CCL: Re: G: Cartesian Coordinate Transformation
 How many times should be published and republished the quaternion solution
 of the RMS problem ?
 Furthermore, it is simpler to use the vector expression of the quaternion
 rather than its 4*4 matricial formulation.
 There are practical details in my two papers in J.Math.Phys:
 1999, 40(9), 4587-4595 (see the appendix)
 2002, 43(8), 4147-4157 (see appendix A.5 for the extension to nfinite or/and
   continuous distributions of points)
 See also:
 http://petitjeanmichel.free.fr/itoweb.petitjean.shape.html
 Sent to CCL by: Paul Fleurat-Lessard [Paul.Fleurat-Lessard(a)ens-lyon.fr]
 > ...
 > As already mentionned, you can play with the iniertia tensor, but this=20
 > can lead to orientation problem. I think that a more robust way is to=20
 > use quaternion procedure as in the rmsd calculation.
 > You can find details in:
 >  J Comput Chem 25: 1849 =AD1857, 2004, 'Using Quaternions to Calculate=20
 > RMSD' ,  EVANGELOS A. COUTSIAS, CHAOK SEOK, KEN A. DILL
 > ...
 Michel Petitjean,                     Email: petitjean-,-itodys.jussieu.fr
 ITODYS (CNRS, UMR 7086)                      ptitjean-,-ccr.jussieu.fr
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