On 21 Sep 2001, Edward C. Lang wrote:
> (please Cc: me in replies, as I am not on the r-help list)
>
> Hi,
>
> I have discovered that underscores are not allowed in variable names,
> although this is not by any means the first instance of such a
> discovery. Short of going through all my other data, and removing
> underscores, is it possible to quote underscores in R? I had something
like:
>
> > plot(g\_code ~ sp\_code, data=genes)
> Error: syntax error
Quoting is by "" in S/R. But how did you get the names there in the
first
place? data.frame and read.table (for example) check for valid names and
change them (by using a `.').
> genes <- data.frame("g_code"=1:10, "sp_code"=1:10,
check.names=F)
> plot("g_code" ~ "sp_code", data=genes)
shows that quoting is not being supported in handling formulae.
(It failed in S as well, at a different point.)
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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