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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> 
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