[R] "nonstandard" column names

[Bill.Venables at csiro.au]

Eh?  I think x$"CPI/RPI" does work.  See below, with two other ways.

> m <- data.frame(x = 1:3, "CPI/RPI" = 4:6, check.names = FALSE)
> m
  x CPI/RPI
1 1       4
2 2       5
3 3       6

> m$"CPI/RPI"      ### works for me!
[1] 4 5 6

> m[, "CPI/RPI"]
[1] 4 5 6

> m[["CPI/RPI"]]
[1] 4 5 6

 

 


Bill Venables
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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Moshe Olshansky
Sent: Tuesday, 22 January 2008 9:37 AM
To: r-help at r-project.org
Subject: [R] "nonstandard" column names

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.

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