Kevin! I've sent 5 replies to your questions already off-list.
The first question is easy (see below). The others will need more information on your data (via str(trx) abd str(try)) and you versions (sessionInfo()) as previously asked off-list. Sorry to out you, but this is bad form. Max > I am learning caret package, and I want to use the RFE to reduce the > feature. I want to use RFE coupled Random Forest (RFE+FR) to complete this > task. As we know, there are a number of pre-defined sets of functions, like > random Forest(rfFuncs), however,I want to tune the parameters (mtr) when > RFE, and then I write code below, but there is something wrong message, How > can I deal with it? >> rfGrid<-expand.grid(.mtry=c(1:2)) >> rfectrl<-rfeControl(functions=caretFuncs,method="cv",verbose=F,returnResamp="final",number=10) >> subsets<-c(3,4) >> set.seed(2) >> rf.RFE<-rfe(trx,try,sizes=subsets,rfeControl=rfectrl,method="rf",tuneGrid=rfGrid) > Loading required package: class > > Attaching package: 'class' > > > The following object(s) are masked from package:reshape : > > condense > > Fitting: mtry=1 > Fitting: mtry=2 > Error in varImp.randomForest(object$finalModel, ...) : > subscript out of bounds > In addition: Warning message: > package 'e1071' was built under R version 2.10.1 You didn't pass importance = TRUE to randomForest > At the same time, If I want to use RFE+SVM, RFE+nnet, and so on ,how can I > do? I have try RFE+SVM, also wrong message:> set.seed(1) >> svmProfile<-rfe(trx,try,sizes=c(1:3), > + rfeControl=rfeControl(functions=caretFuncs,method="cv", > + verbose=F,returnResamp="final",number=10), > + method="svmRadial",tuneLength=5) > Fitting: sigma=0.009246713, C=0.1 > Fitting: sigma=0.009246713, C=1 > Fitting: sigma=0.009246713, C=10 > Fitting: sigma=0.009246713, C=100 > Fitting: sigma=0.009246713, C=1000 > Error in rfeControl$functions$rank(fitObject, .x, y) : > need importance columns for each class -- Max ______________________________________________ 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.