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 <julioser...@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"]] : subíndice fuera de los límites
>> 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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