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
> <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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