CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

yanyajie wrote:
> Hi,
>  
> I went through the PCA package mannual and found that eigenvalues or 
> eigenvectors couldn’t be explicitly obtained. I didn’t find solution in 
> the part of linear algebra, too. Does CGAL 3.7 really not provide these 
> information by any means?
>  
> If there is something I miss which can easily help me compute 
> eigen-related info, could someone point out please?
>  
> If my guess is right about CGAL 3.7’s inability on this, then could 
> someone tell me why it is designed this way? Why eigen vectors and 
> values are hidden away? Do I need to do this myself?? This is so weird...
>  
>  
> THX!!!
>  
> Yan.
For dimension 3, have a look in the file PCA_util.h for the
functions fitting_plane_3 and fitting_line_3. You should be able
to get both (see how these functions are called from
linear_least_squares_fitting_3 function).


Feel free to provide an API on how this could be exposed in CGAL.

S.