On Fri, 4 Nov 2005, Liaw, Andy wrote: > > For some of the data we encounter, all X variables are binary, so each data > point can be encoded into a bitstring. There are algorithms that take > advantage of that. The problem is interfacing such code with R. I know of > no good solutions. As I told Grant, I thought about what he did, too, but > the difficulty is how to pass such data structures to R. Actually, some > time down the road I might try to use the dendrogram class that's in R, and > manipulate them in C.
I faced similar problems some time ago and ended up representing a (binary) tree as recursive lists which can be manipulated from both the C and R side. The `party' package has the code (and an internal random forest function, however, without R interface yet) and the vignette explains some details. Best, Torsten > Not sure about efficiency though. > > Andy > > > > Hin-Tak Leung > > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > > > > > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
