Dear Luca,
                             Thank you very much. It now works in both
ways. Thanks for advice.

Regards,
Heena

On Fri, Jul 24, 2020 at 12:31 PM luca.heltai <luca.hel...@gmail.com> wrote:

> KDTree needs nanoflann to be available. Did you compile deal.II with
> nanoflann exnabled? Check in the summary.log if DEAL_II_WITH_NANOFLANN is
> ON.
>
> RTree, on the other hand, does not require nanoflann, as it is included
> with boost (and it is faster than nanoflann).
>
> L.
>
> > On 24 Jul 2020, at 10:05, heena patel <heena8...@gmail.com> wrote:
> >
> > Dear Luca,
> >                                 I am using 9.2 version and the
> implementation I try to follow  from your presentation at SISSA 2018 but it
> gives me error. Following are the lines I added to step-1. I want to
> implement K nearest neighbor. I will work on your suggestion.
> > #include <deal.II/numerics/kdtree.h>
> > Point<2>  p;
> >    KDTree<2> tree(10,triangulation.get_vertices());
> >    auto w = tree.get_closest_points(p, 3);
> >
> > Regards,
> > Heena
> >
> >
> > On Fri, Jul 24, 2020 at 8:30 AM Luca Heltai <luca.hel...@gmail.com>
> wrote:
> > If you are using version 9.3pre of deal.II, kdtree was removed. Use
> RTree instead, which is faster and more flexible.
> >
> > Luca
> >
> >> Il giorno 24 lug 2020, alle ore 05:41, heena patel <heena8...@gmail.com>
> ha scritto:
> >>
> >> 
> >> Dear Bruno,
> >>                                I had already added kdree.h header file,
> check the question again. But it seems it does not read KDTree; something
> is not compatible between class and header file.
> >>
> >> Regards,
> >> Heena
> >>
> >> On Thu, Jul 23, 2020 at 9:03 PM Bruno Turcksin <
> bruno.turck...@gmail.com> wrote:
> >> Heena,
> >>
> >> You are missing an include. Try adding #include
> <deal.II/numerics/kdtree.h>
> >>
> >> Best,
> >>
> >> Bruno
> >>
> >> On Thursday, July 23, 2020 at 2:55:53 PM UTC-4, heena patel wrote:
> >>
> >> Dear all,
> >>                           I had tried to implement KDTree in step_1
> tutoria and header file for kdtree is added to the codel. It is as follows:
> >>
> >> void first_grid()
> >> {
> >>
> >>   Triangulation<2> triangulation;
> >>
> >>   GridGenerator::hyper_cube(triangulation);
> >>   triangulation.refine_global(4);
> >>   Point<2>  p;
> >>    KDTree<2> tree(10,triangulation.get_vertices());
> >>    auto w = tree.get_closest_points(p, 3);
> >>   std::ofstream out("grid-1.svg");
> >>   GridOut       grid_out;
> >>   grid_out.write_svg(triangulation, out);
> >>   std::cout << "Grid written to grid-1.svg" << std::endl;
> >> }
> >>
> >>
> >>
> >> It gives me error as below
> >>
> >> /home/heena/Project/examples/step-1/step-1.cc:76:4: error: ‘KDTree’ was
> not declared in this scope
> >>     KDTree<2> tree(10,triangulation.get_vertices());
> >>     ^~~~~~
> >> /home/heena/Project/examples/step-1/step-1.cc:76:4: note: suggested
> alternative: ‘free’
> >>     KDTree<2> tree(10,triangulation.get_vertices());
> >>     ^~~~~~
> >>     free
> >> /home/heena/Project/examples/step-1/step-1.cc:76:14: error: ‘tree’ was
> not declared in this scope
> >>     KDTree<2> tree(10,triangulation.get_vertices());
> >>               ^~~~
> >> /home/heena/Project/examples/step-1/step-1.cc:76:14: note: suggested
> alternative: ‘free’
> >>     KDTree<2> tree(10,triangulation.get_vertices());
> >>               ^~~~
> >>               free
> >>
> >>
> >>
> >> Is there something missing?
> >>
> >>
> >>
> >> Regards,
> >> Heena
> >>
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