Re: [Boost-users] can not compile nearest neighbors in d dimensions

On 16 April 2014 14:32, Georgios Samaras wrote:

Thanks for the replies, now it is clearer. However, the minimum dimension I have in my datasets is 100 and I want to run NN with dimension 10000.

So, how I am going to initialize a point?

template <int CompileTimeDimension> void fill(point& tmp) { for(int j = CompileTimeDimension - 1 ; j >= 0 ; --j) { bg::set<CompileTimeDimension-->(tmp, 5); } }

Even I can see that the above code won't even compile. Writting manually bg::set<0>(tmp, 5), ..., bg::set<10000>(tmp, 5) does not really sound a good idea. So what should I do?

Once again, dimension is a compile-time property. #include #include namespace bg = boost::geometry; template struct fill { template <typename Point> static void apply(Point& p, typename bg::coordinate_type<Point>::type const& v) { bg::set<D>(p, v); fill::apply(p, v); } }; template struct fill { template <typename Point> static void apply(Point&, typename bg::coordinate_type<Point>::type const&) {} }; int main() { bg::model::point p1; fill<0, 1000>::apply(p1, 5); return 0; } But, you will likely hit compiler limits asking for 10K dimensions.

Maybe boost nearest's neighbors are meant to be used in higher dimensions?

Your problem has *nothing* to do with the NN algorithm as it is implemented in Boost.Geometry. Best regards, -- Mateusz Łoskot, http://mateusz.loskot.net