Re: [R] alpha shape function

Hi, on response to the thread of february, I recently uploaded the package alphahull, that computes the alpha-shape of a given sample of points in the plane. Regrets, Bea __ Beatriz Pateiro López Departamento de Estatística e IO Universidad de Santiago

[R] alpha shape function

Hi all, I want to approximate te shape of an area defined by a set of points. The convex hull is not good enough, but I think that an alpha shape would be fine. I did an RSiteSearch(), google search, RSeek.org search, looked at the CRAN Views, but was unable do find a function in R that

Re: [R] alpha shape function

As it happens, I have also been looking into this. I began by considering Ken Clarkson's hull: http://www.netlib.org/voronoi/hull.html but eventually discovered that its alpha shapes don't seem to treat holes in regions, only simply connected regions. (I would be happy to hear to the

Re: [R] alpha shape function

Hi, If the convex hull for *all* the data points is not ideal enough, is it feasible to break the data into small subsets using clustering methods such as kmeans() and compute the convex hull for each cluster? Finally we are able to know the borders of all clusters using chull(); I don't know how