Could someone tell me how to fix the following error? It looks like that the reason is that df$x is of the class "factor". Thanks!
> x1<-LETTERS[1:8]; x2<-letters[1:8]; x1[2]<-NA; x1[4]<-NA; > df<-data.frame(x1=x1, x2=x2) > idx<-which(is.na(df$x1)) > df[idx,1]<-df[idx,2] Warning message: invalid factor level, NAs generated in: "[<-.factor"(`*tmp*`, iseq, value = c(2, 4)) > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
