Moshe Olshansky wrote:
> Hi everyone,
>
> I am sure that this question has been asked here some
> time ago but I do not remember the answer and was
> unable to find it in the archives...
>
> Below is my question: suppose that I have a data.frame
> x and one of it's columns name is "CPI/RPI" (without
> quotation marks of course). How can I reference this
> column? Neither of x$CPI/RPI or x$"CPI/RPI" work. I
> certainly can do x[,which(colnames(x) == "CPI/RPI")]
> but there should be a nicer way to do this.
>
> Thank you!
>
> Moshe Olshansky.
Moshe,
Not a problem here, using 2.6.1 patched:
DF <- data.frame(A = 1:5, B = letters[1:5])
colnames(DF) <- c("CPI/RPI", "Col2")
> DF
CPI/RPI Col2
1 1 a
2 2 b
3 3 c
4 4 d
5 5 e
> DF$"CPI/RPI"
[1] 1 2 3 4 5
> DF[, "CPI/RPI"]
[1] 1 2 3 4 5
> subset(DF, select = "CPI/RPI")
CPI/RPI
1 1
2 2
3 3
4 4
5 5
HTH,
Marc Schwartz
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