[R] use of "@" character in variable name

[Gabor Grothendieck]

Its possible to have otherwise illegal names by surrounding them
in backticks:

> `a at b` <- 3
> `a at b`
[1] 3

> `if` <- 55
> `if`
[1] 55

Also note use of check.names=FALSE:

> Lines <- "a at b if
+ 1 2"
> DF <- read.delim(textConnection(Lines), header = TRUE, check.names = FALSE)
> DF
  a at b if
1    1 2


On Thu, Mar 26, 2009 at 9:04 PM, Mike Miller <mbmiller+l at gmail.com> wrote:
> Importing data with a header row using read.delim, one variable should be
> named @5HTT but it is automatically renamed to X.5HTT, presumably because
> the "@" is either unacceptable or misunderstood.  I've tried to find out
> what the rules are on variable names but have been unsuccessful.  I'll bet
> someone here can tell me where to look.  Maybe it's hidden away in here
> somewhere:
>
> http://cran.r-project.org/doc/manuals/R-data.pdf
>
> Thanks in advance.
>
> Mike
>
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