Named rows in a table (data frame) read from a file
Don't use attach. I know it's tempting, but it's really not worth it in the long run. (Cf. Genesis 3, ff.) This works: F1["a", "Price"] Incidentally the reason yours didn't work is because the row names are part of F1, not Price so attach() doesn't carry them along. In short, row names good; attach bad. Michael
On Nov 16, 2011, at 7:11 PM, JulioSergio <juliosergio at gmail.com> wrote:
I read a table as follows:
F1 <- read.table("Rtext3.txt")
F1
Price Floor Area Rooms Age Cent.heat a 52.00 111 830 5 6.2 no b 54.75 128 710 5 7.5 no c 57.50 101 1000 5 4.2 no d 57.50 131 690 6 8.8 no e 59.75 93 900 5 1.9 yes As it is seen, the rows have a name. However I don't know how to access a particular element from that name, for instance,
attach(F1) Price
[1] 52.00 54.75 57.50 57.50 59.75
Price[["a"]]
Error en Price[["a"]] : sub?ndice fuera de los l?mites
Price$a
Error en Price$a : $ operator is invalid for atomic vectors
Price['a']
[1] NA
Price["a"]
[1] NA If I cannot access particular elements of the frame components by the row names, is there any use of having the rows named? Thanks, Sergio.
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