Apologies for catching this so late. Have been out for a few weeks and still trying to recover from that...
From: Jim Porzak > > Hi Wanghong, > > Unless you have a huge linux box, you will need to sample > down your 300k > rows to a few thousand. > > In marketing aps, I often have data sets of comparable size. > > I would suggest you start with a just a few k rows to make > sure everything > else is working as you wish. Also, study carefully Andy's > randomForest docs > - including the R News article a couple years ago. > > In particular, > > 1) the formula interface is a memory hog. Andy suggests just > using explicit > declaration. In you case, something like > randomForest(Memebers[42], Memebers[-42], ... Actually that first argument probably should be Members[[42]]. I believe you get a data frame with one variable if you do Members[42]. Best, Andy > 2) proximity matirx is also memory & time intensive. Suggest > proximity = > FALSE until, other things sorted out. > > HTH, > Jim Porzak > TGN.com > San Francisco, CA > http://www.linkedin.com/in/jimporzak > useR Group SF: http://ia.meetup.com/67/ > > > 2008/12/26 wanghong <wangh...@neusoft.edu.cn> > > > hello, > > I want to use randomForest to classify a matrix which is > 331030¡Á42,the last > > column is class signal.I use £º > > > Memebers.rf<-randomForest(class~.,data=Memebers,proximity=TRUE > ,mtry=6,ntree=200) > > which told me" the error is matrix(0,n,n) set too elements" > > then I use: > > > Memebers.rf<-randomForest(class~.,data=Memebers,importance=TRU E,proximity=TRUE) > > which told me"the error is na.fail.default(list(class = > c(17L, 17L, 17L, > > 29L, 29L, 29L, : > > missing values in object > > " > > > > what's wrong with it .Thanks a lot > > > > > > wanghong > > wangh...@neusoft.edu.cn > > 2008-12-26 > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > [[alternative HTML version deleted]] > > Notice: This e-mail message, together with any attachme...{{dropped:12}} ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
