Prof Brian D Ripley
Wed, 7 Apr 1999 15:46:44 +0100 (BST)
On Wed, 7 Apr 1999, Dipl.-Stat. Detlef Steuer wrote:
> Is there someone already working on an implementation of Splus'
> chull() function for R?
> If not, I would like volunteer to try it.
> For my "Diplom" I implemented convex peeling in C (some time ago),
> using an O(n log(n)) algorithm, so it probably will prove relatively easy to
> use that code for a R-function.
If only you had volunteered a month ago!
There is one implementation in package sm, and a cleaner one in 0.64, due
out today. Both as versions of Eddy's 1977 algorithm. I would be happy to
replace the present chull by something better, though. It doesn't do
peeling, but that is easy to arrange in R: just remove the convex hull and
Brian D. Ripley, email@example.com
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
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