Delaunay Triangulation and Dirichlet (Voronoi) Tesselation.

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deldir Construct the Delaunay triangulation and the Dirichlet (or Voronoi) tessellation of a planar point set.
plot.deldir Produce a plot of the Delaunay triangulation and Dirichlet (Voronoi) tesselation of a planar point set, as constructed by the function deldir.