On Thu, Dec 30, 2010 at 07:10:33AM -0800, maysher wrote: > > Hi all, I'm a newbee using R. I need to do a classification tree using the > rpart package. Basically I have a set of birds of known sex and several > morphological measurements and we want to predict the sex using the > morphology. I read my csv file and it shows up in R no problem, looks fine > but when I execute the following rpart command > > hawkadults_rpart<-rpart(Sex∼Footpad+Mean_2ndlength+Bill_length+Tarsus_reg+Mass+Wing_chord,method="class",data=hawkadultsDF) > > I get the message Error: unexpected input in "hawkadults_rpart<-rpart(Sex‚"
The formula in your input contains a tilda character, which is not the ASCII tilda (7E), but some other UTF-8 character (E2 88 BC). For comparison, the two characters are "~" and "∼" (in the same order). Which of these two was in your actual R code? In a formula, the ASCII tilda is required. Petr Savicky. ______________________________________________ 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.
