Re: [Rd] Classification Trees and basic Random Forest pkg using tree structures in C

From: Hin-Tak Leung <hin-tak.leung_at_cimr.cam.ac.uk>
Date: Fri 04 Nov 2005 - 17:43:10 GMT

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? 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).

Hin-Tak Leung



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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sat Nov 05 04:46:24 2005

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