Hello!
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.
Well, as least as easy as any programming tends to be. :-)
Detlef Steuer
Detlef Steuer Universitaet Dortmund ///////
LS Computergestuetzte Statistik U N I D O ///
steuer@amadeus.statistik.uni-dortmund.de ______///////
Tel: ++49 +231 755 4353 Fax: ++49 +231 755 4387 \_\_\_\/////
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On Wed, 7 Apr 1999, Dipl.-Stat. Detlef Steuer wrote:> Hello! > > 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 repeat. -- Brian D. Ripley, ripley@stats.ox.ac.uk 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) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._