Named rows in a table (data frame) read from a file

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.
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

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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Hi,
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)
That's your biggest problem. Don't attach your dataframe.
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?
Sure you can. It works just like any other indexing of data frames,
with the caveat that a data frame is really a list with the columns as
elements, so there are indexing options not available for rows.

Since you didn't provide any data, here's a toy example:
test <- data.frame(X=1:3, Y=4:6, Z=7:9)
rownames(test) <- c("a", "b", "c")
test
X Y Z
a 1 4 7
b 2 5 8
c 3 6 9
test["a",]
X Y Z
a 1 4 7
test["a", "Y"]
[1] 4
test["a",][3]
Z
a 7

Sarah
Thanks,

Sergio.

Sarah Goslee
http://www.functionaldiversity.org
R. Michael Weylandt <michael.weylandt <at> gmail.com> <michael.weylandt <at> 
gmail.com> writes:
..

Thanks Michael
Sarah Goslee <sarah.goslee <at> gmail.com> writes:

Thank you, Sara!
Your information is's been very useful