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One of the best place to search and explore source code for PostGIS is through the GitHub mirror: https://github.com/postgis/postgis For instance, search ST_DWithin, where you will then search LWGEOM_dwithin, then lwgeom_mindistance2d_tolerance, then lw_dist2d_comp, then lw_dist2d_recursive, and then different versions of lw_dist2d_distribute* ...


If you would like to calculate GWR in R, you should try GWmodel. If you need to do it in Python, you can also use pygwr. GWmodel contains many geographically-weighted (GW) models including gwr (GW regression), gwpca(GW principal components analysis), gwda(GW Discriminant Analysis), gwr.generalised(Generalised GWR models, including Poisson and Binomial), ...

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