> From: Hin-Tak Leung > > Izmirlian, Grant (NIH/NCI) wrote: > <snipped> > > The only interesting feature is that the tree structure has been > > implemented in C. Its a neater way to carry stuff around and I am > > guessing would make future implementation easier. > > > > Because of its inherent redundancy from the users standpoint, it > > isn't something to send to CRAN. However, I was wondering whether > > anyone is interested in a copy? > > Hi, > > Hmm, why didn't you just post a URL?
Isn't it a bit too much to assume that everyone has a personal web space somewhere? > Incidentally I am actually very > interested in seeing your code. I am working on a project where > the data set is extremely large, but the permuntation of the states of > the data is extremely small. Each piece of data consists of only 4 > states, so stuffing it as an R object (which takes up 32-byte? on > 32-bit machines) or even an char vector is quite wasteful; so I > have written a "strange" data.frame where internally it uses only > 2-bit for storage. (it is still work-in-process but I have got to > the point of being able to get and set each 2-bit cell now). 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. 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
