Hello, I have a vector x containing letters ("a", "b" etc.). Now I want to convert it to factor and group some letters into one common level. If I do it by factor function, giving the same label names for all values I want to group, it doesn't work:
> x<-letters[1:5] > x [1] "a" "b" "c" "d" "e" > f<-factor(x,levels=letters[1:5], labels=c("vowel","consonant","consonant","consonant","vowel")) > levels(f) [1] "vowel" "consonant" "consonant" "consonant" "vowel" But, after it, if I update level names by a single assignment, levels with the same names will group, even when I don't change all of them: > levels(f)[1]<-"vowel" #changing only one vector item will make ALL levels to group > levels(f) [1] "vowel" "consonant" I'm rather confused! I think this behavior is double inconsistent. First, the labeling in factor function should work similarly as in levels<- , i.e. they should group levels with the same names either BOTH or NONE. Second, if I change only one vector item, it should not change anything else, especially it should not make any "invisible" grouping. Or am I wrong? Or is it a bug? Jan Hucin ______________________________________________ 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.