Dear R-help, I was surprised to find that data.frame() keeps the names of all columns:
> x1 <- structure(1:5, names=1:5) > x2 <- structure(5:1, names=5:1) > x3 <- structure(10:6, names=10:6) > x <- data.frame(x1, x2, x3) > str(x) `data.frame': 5 obs. of 3 variables: $ x1: Named int 1 2 3 4 5 ..- attr(*, "names")= chr "1" "2" "3" "4" ... $ x2: Named int 5 4 3 2 1 ..- attr(*, "names")= chr "5" "4" "3" "2" ... $ x3: Named int 10 9 8 7 6 ..- attr(*, "names")= chr "10" "9" "8" "7" ... I could not find mention of this in ?data.frame. The problem is that when I extract a column of `x', I would be expected the rownames of the data frame to be used as the names (and short of that, no names attribute), rather than the original names. Is this intentional? Best, Andy Andy Liaw, PhD Biometrics Research PO Box 2000, RY33-300 Merck Research Labs Rahway, NJ 07065 mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> 732-594-0820 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
