IMP::algebra::get_uniform_cover_rotations_3d
hi Daniel -
Frido and I are using get_uniform_cover_rotations_3d for exhaustive rotational sampling. The code for this function seems to sample random vectors on a 4D sphere. How sensitive is it to poles over sampling?
thanks, Keren.
If you don't have cgal installed, it just takes n random points uniformly over the upper half of the 4 sphere.If you have CGAL, it smooths them out some.
I'm not sure what you mean by poles (it is uniform over the upper 4-sphere).
On Oct 6, 2010, at 6:43 AM, Keren Lasker wrote:
> hi Daniel - > > Frido and I are using get_uniform_cover_rotations_3d for exhaustive > rotational sampling. > The code for this function seems to sample random vectors on a 4D > sphere. > How sensitive is it to poles over sampling? > > thanks, > Keren. > _______________________________________________ > IMP-dev mailing list > IMP-dev@salilab.org > https://salilab.org/mailman/listinfo/imp-dev
thanks Daniel. you mean that its uniform on patches of the same area on the sphere right? in that case it might be ok. On Oct 6, 2010, at 5:22 PM, Daniel Russel wrote:
> If you don't have cgal installed, it just takes n random points > uniformly over the upper half of the 4 sphere.If you have CGAL, it > smooths them out some. > > I'm not sure what you mean by poles (it is uniform over the upper 4- > sphere). > > On Oct 6, 2010, at 6:43 AM, Keren Lasker wrote: > >> hi Daniel - >> >> Frido and I are using get_uniform_cover_rotations_3d for exhaustive >> rotational sampling. >> The code for this function seems to sample random vectors on a 4D >> sphere. >> How sensitive is it to poles over sampling? >> >> thanks, >> Keren. >> _______________________________________________ >> IMP-dev mailing list >> IMP-dev@salilab.org >> https://salilab.org/mailman/listinfo/imp-dev > > > _______________________________________________ > IMP-dev mailing list > IMP-dev@salilab.org > https://salilab.org/mailman/listinfo/imp-dev
The non-cgal version just chooses points on the upper hemisphere in 4D with uniform probability (since quaternions are sign-invariant). Not sure what you mean by patches.
On Oct 6, 2010, at 8:26 AM, Keren Lasker wrote:
> thanks Daniel. > you mean that its uniform on patches of the same area on the sphere > right? > in that case it might be ok. > On Oct 6, 2010, at 5:22 PM, Daniel Russel wrote: > >> If you don't have cgal installed, it just takes n random points >> uniformly over the upper half of the 4 sphere.If you have CGAL, it >> smooths them out some. >> >> I'm not sure what you mean by poles (it is uniform over the upper 4- >> sphere). >> >> On Oct 6, 2010, at 6:43 AM, Keren Lasker wrote: >> >>> hi Daniel - >>> >>> Frido and I are using get_uniform_cover_rotations_3d for exhaustive >>> rotational sampling. >>> The code for this function seems to sample random vectors on a 4D >>> sphere. >>> How sensitive is it to poles over sampling? >>> >>> thanks, >>> Keren. >>> _______________________________________________ >>> IMP-dev mailing list >>> IMP-dev@salilab.org >>> https://salilab.org/mailman/listinfo/imp-dev >> >> >> _______________________________________________ >> IMP-dev mailing list >> IMP-dev@salilab.org >> https://salilab.org/mailman/listinfo/imp-dev > > _______________________________________________ > IMP-dev mailing list > IMP-dev@salilab.org > https://salilab.org/mailman/listinfo/imp-dev
participants (2)
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Daniel Russel -
Keren Lasker