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Re: [cgal-discuss] compiling error of "linear_least_squares_fitting_3" under :Exact_predicates_exact_constructions_kernel


Chronological Thread 
  • From: Kai WANG <>
  • To:
  • Subject: Re: [cgal-discuss] compiling error of "linear_least_squares_fitting_3" under :Exact_predicates_exact_constructions_kernel
  • Date: Fri, 7 Oct 2011 14:56:51 +0800
Thanks for the hint! That'll be quite useful for me.

On Fri, Oct 7, 2011 at 2:17 PM, Sebastien Loriot (GeometryFactory) <> wrote:
Kai WANG wrote:
You are right Sebastien...Even if A added the "sqrt", there are still erros showing the "atan" "sin" "cos" need to be re-defined...
Does it mean I need to use two kinds of kernels in a same project if I want to ensure the calculation of intersection and linear_least_square_fitting at the same time?

Yes, have a look at the Cartesian_converter that will help you
converting objects from one kernel to another.

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Kernel_23_ref/Class_Cartesian_converter.html

Sebastien.


On Thu, Oct 6, 2011 at 11:49 PM, Sebastien Loriot (GeometryFactory) < <mailto:>> wrote:

   You cannot do it exactly. You can only get an approximation.

   Something like this should work

   K::FT sqrt(K::FT v) {
    return K::FT(std::sqrt(CGAL::to___double(v)));

   }

   No guarantee that you will not have a problem with another
   function not available for this number type.

   Sebastien.


   Kai WANG wrote:

       I'm sorry that I still don't quite understand how to modify it.
       Could you please give a detailed explanation on the way to add a
       "sqrt" function please? For example, given the following simple
       program which has complile error, where should I add the "sqrt"
       function please?
       Thanks very much for ur help!


       typedef CGAL::Exact_predicates_exact___constructions_kernel K;

       typedef K::Line_3            Line;
       typedef K::Plane_3           Plane;
       typedef K::Point_3           Point;
       typedef K::Triangle_3        Triangle;

       int main(void)
       {
        std::list<Triangle> triangles;
        Point a(1.0,2.0,3.0);
        Point b(4.0,0.0,6.0);
        Point c(7.0,8.0,9.0);
        Point d(8.0,7.0,6.0);
        Point e(5.0,3.0,4.0);
        triangles.push_back(Triangle(__a,b,c));
        triangles.push_back(Triangle(__a,b,d));
        triangles.push_back(Triangle(__d,e,c));


        Line line;
        Plane plane;

        // fit plane to whole triangles
        linear_least_squares_fitting___3(triangles.begin(),triangles.__end(),plane,CGAL::Dimension___tag<2>());

         // fit line to triangle vertices
        linear_least_squares_fitting___3(triangles.begin(),triangles.__end(),line,

       CGAL::Dimension_tag<0>());
         return 0;
       }




       On Thu, Oct 6, 2011 at 11:31 PM, Sebastien Loriot
       (GeometryFactory) <
       <mailto:> <mailto:

       <mailto:>>> wrote:

          the PCA package make use of the square root function, so the
       underlying
          number type in the kernel you are using should have a sqrt
       function
          available.

          Sebastien.



          kyewong wrote:

              Hi,
              When I'm using the linear_least_squares_fitting_3 and
              CGAL::Exact_predicates_exact_____constructions_kernel as

       kernel,

              there will be a
              compile error as follows.
              Could anyone tell me how to modify it if I want to use
       both of
              them at the
              same time please? Thanks very much!


              1>F:\Program
       Files\CGAL-3.8\include\CGAL/____PCA_util.h(132) :


              error C2665:
              'sqrt' : none of the 3 overloads could convert all the
       argument
              types
              1>        F:\Program Files\Microsoft Visual Studio
              9.0\VC\include\math.h(581): could be 'long double
       sqrt(long double)'
              1>        F:\Program Files\Microsoft Visual Studio
              9.0\VC\include\math.h(533): or       'float sqrt(float)'
              1>        F:\Program Files\Microsoft Visual Studio
              9.0\VC\include\math.h(128): or       'double sqrt(double)'
              1>        while trying to match the argument list
              '(CGAL::Lazy_exact_nt<ET_>)'
              1>        with
              1>        [
              1>            ET_=CGAL::Gmpq
              1>        ]
              1>        F:\Program
                     Files\CGAL-3.8\include\CGAL/____linear_least_squares_fitting_____triangles_3.h(57)


              :
              see reference to function template instantiation 'void
                     CGAL::internal::assemble_____covariance_matrix_3&lt;____InputIterator,K&gt;(____InputIterator,InputIterator,____CGAL::Lazy_exact_nt<ET_>


              [],const CGAL::Point_3<R_> &,const K &,const
              CGAL::Triangle_3<R_> *,const
              CGAL::Dimension_tag<dim> &)' being compiled
              1>        with
              1>        [
              1>                   InputIterator=std::list<____Triangle>::_Iterator<true>,


              1>            K=CGAL::Epeck,
              1>            ET_=CGAL::Gmpq,
              1>            R_=CGAL::Epeck,
              1>            dim=2
              1>        ]
              1>        F:\Program
                     Files\CGAL-3.8\include\CGAL/____linear_least_squares_fitting_____3.h(58)


              : see
              reference to function template instantiation
              'CGAL::Lazy_exact_nt<ET_>
                     CGAL::internal::linear_least_____squares_fitting_3&lt;____InputIterator,Kernel&gt;(____InputIterator,InputIterator,____CGAL::Plane_3<R_>


              &,CGAL::Point_3<R_> &,const CGAL::Triangle_3<R_> *,const
       K &,const
              CGAL::Dimension_tag<dim> &)' being compiled
              1>        with
              1>        [
              1>            ET_=CGAL::Gmpq,
              1>                   InputIterator=std::list<____Triangle>::_Iterator<true>,


              1>            Kernel=CGAL::Epeck,
              1>            R_=CGAL::Epeck,
              1>            K=CGAL::Epeck,
              1>            dim=2
              1>        ]
              1>        F:\Program
                     Files\CGAL-3.8\include\CGAL/____linear_least_squares_fitting_____3.h(76)


              : see
              reference to function template instantiation
              'CGAL::Lazy_exact_nt<ET_>
                     CGAL::linear_least_squares_____fitting_3&lt;InputIterator,____Object,CGAL::Epeck,Tag&gt;(____InputIterator,InputIterator,____Object


              &,CGAL::Point_3<R_> &,const Tag &,const Kernel &)' being
       compiled
              1>        with
              1>        [
              1>            ET_=CGAL::Gmpq,
              1>                   InputIterator=std::list<____Triangle>::_Iterator<true>,


              1>            Object=Plane,
              1>            Tag=CGAL::Dimension_tag<2>,
              1>            R_=CGAL::Epeck,
              1>            Kernel=CGAL::Epeck
              1>        ]
              1>        F:\Program
                     Files\CGAL-3.8\include\CGAL/____linear_least_squares_fitting_____3.h(93)


              : see
              reference to function template instantiation
              'CGAL::Lazy_exact_nt<ET_>
                     CGAL::linear_least_squares_____fitting_3&lt;InputIterator,____Object,CGAL::Point_3&lt;R_&gt;____,Tag>(InputIterator,____InputIterator,Object


              &,Point &,const Tag &)' being compiled
              1>        with
              1>        [
              1>            ET_=CGAL::Gmpq,
              1>                   InputIterator=std::list<____Triangle>::_Iterator<true>,


              1>            Object=Plane,
              1>            R_=CGAL::Epeck,
              1>            Tag=CGAL::Dimension_tag<2>,
              1>            Point=CGAL::Point_3<CGAL::____Epeck>
              1>        ]
              1>               .\linear_least_squares_____fitting_triangles_3.cpp(33) :


              see reference
              to function template instantiation 'CGAL::Lazy_exact_nt<ET_>
                     CGAL::linear_least_squares_____fitting_3&lt;std::list&lt;_Ty&____gt;::_Iterator<_Secure_____validation>,Plane,CGAL::____Dimension_tag<dim>>(____InputIterator,InputIterator,____Object


              &,const Tag &)' being compiled
              1>        with
              1>        [
              1>            ET_=CGAL::Gmpq,
              1>            _Ty=Triangle,
              1>            _Secure_validation=true,
              1>            dim=2,
              1>                   InputIterator=std::list<____Triangle>::_Iterator<true>,


              1>            Object=Plane,
              1>            Tag=CGAL::Dimension_tag<2>
              1>        ]

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              View this message in context:
                     http://cgal-discuss.949826.n4.____nabble.com/compiling-error-__of-__linear-least-squares-__fitting-__3-under-Exact-__predicates-__exact-__constructions-kernel-____tp3878596p3878596.html
       <http://nabble.com/compiling-error-of-__linear-least-squares-fitting-__3-under-Exact-predicates-__exact-constructions-kernel-__tp3878596p3878596.html>

                     <http://cgal-discuss.949826.__n4.nabble.com/compiling-error-__of-linear-least-squares-__fitting-3-under-Exact-__predicates-exact-__constructions-kernel-__tp3878596p3878596.html

       <http://cgal-discuss.949826.n4.nabble.com/compiling-error-of-linear-least-squares-fitting-3-under-Exact-predicates-exact-constructions-kernel-tp3878596p3878596.html>>
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