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

From: Hin-Tak Leung <hin-tak.leung_at_cimr.cam.ac.uk>
Date: Mon 07 Nov 2005 - 10:39:01 GMT

Liaw, Andy wrote:
>>From: Hin-Tak Leung
<snipped>

>>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?

Just for the sake of argument... I did assume that nih.gov is a sizeable government organization and have official channnels for such things. That's what government agencies do, and I suppose this software work is in-the-line-of-duty for public consumption and therefore quite appropriate to put on a *.gov web site. (the same applies to *.ac.uk and   *.edu postings).

> 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.

The best examples I have seen of manipulating foreign object is among the omegahat projects, like RSPerl and PSPython. Quite insteresting reading.

Hin-Tak Leung



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