CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

On Wednesday 18 November 2009 11:33:45 Michael Jeulin-L wrote:
> Hi,
> 
> I have a very weird error when I`m trying to use the function
> linear_least_squares_fitting_2.
> 
> I`m just trying to compil the following code with the exact kernel :
> 
> #include <CGAL/Cartesian.h>
> #include <CGAL/linear_least_squares_fitting_2.h>
> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
> 
> using namespace std;
> typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
> typedef K::Point_2    Point_2  ;
> typedef K::Line_2     Line_2   ;
> 
> int main()
> {
>   list<Point_2> points;
>   points.push_back(Point_2(1.0,0.0));
>   points.push_back(Point_2(2.0,0.0));
>   points.push_back(Point_2(3.0,0.0));
> 
>   Line_2 line;
>   linear_least_squares_fitting_2(points.begin(),points.end(),line);

You miss the tag (the fourth parameter). See the example here:
http://www.cgal.org/Manual/last/doc_html/cgal_manual/Principal_component_analysis/Chapter_main.html#Subsection_65.2.4

The compiler just says that there is no function 
linear_least_squares_fitting_2 that takes three parameters.

Furthermore, you should write should qualify the name 
linear_least_squares_fitting_2 with CGAL::
With the argument dependent name lookup (aka ADL or König lookup), the 
qualification with CGAL:: is not mandatory, but you should use it every time, 
to avoid future errors.

-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/