I agree with you about the less practical meaning of this sample of the extreme case. I am just curious about the "grammar" syntax of randomForest.
Thanks. Hui On Tue, Apr 13, 2004 at 05:29:06PM +0200, Philippe Grosjean wrote: > I don't see much why to use random forest with only one predictive variable! > Recall that random forest grow trees with a random subset of variables "in > competition" for growing each node of the trees in the forest... How do you > make such a random subset with only one predictive variable? there is no > point here! > > Philippe Grosjean > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Hui Han > Sent: Tuesday, 13 April, 2004 17:16 > To: [EMAIL PROTECTED] > Subject: [R] randomForest: more than one variable needed? > > > Hi, > > I am doing feature selection for my dataset. The following is > the extreme case where only one feature is left. But I got > the error below. So my question is that do I have to use > more than one features? > > sample.subset > udomain.edu hpclass > 1 -1.0 not > 2 -1.0 not > 3 -0.2 not > 4 1.0 hp > 5 1.0 hp > > randomForest(hpclass ~., data=sample.subset, importance=TRUE); > Error in if (n == 0) stop("data (x) has 0 rows") : > argument is of length zero > > Best regards, > Hui Han > Department of Computer Science and Engineering, > The Pennsylvania State University > University Park, PA,16802 > email: [EMAIL PROTECTED] > homepage: http://www.cse.psu.edu/~hhan > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > Hui Han Department of Computer Science and Engineering, The Pennsylvania State University University Park, PA,16802 email: [EMAIL PROTECTED] homepage: http://www.cse.psu.edu/~hhan ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
