Heena,

You are missing an include. Try adding #include <deal.II/numerics/kdtree.h 
<https://dealii.org/current/doxygen/deal.II/kdtree_8h_source.html>>

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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