[R] reserved words documentation

[ripley@stats.ox.ac.uk]

I had to read the R sources for `S Programming', which says

There are some reserved words you will not be allowed to use, for example
\begin{source}
FALSE Inf NA NaN NULL TRUE
break else for function if in next repeat while
\end{source}
and in the \s. engines (but not \R.) \sfn{return}, \sfn{F} and \sfn{T}.

[That was the list in 1999, and you would need to check.]

Yes, this should be in R-lang, the `Language Definition', but that is 
still a draft.


On Wed, 5 Mar 2003 white.denis at epamail.epa.gov wrote:

> I wanted a data frame component to be named "next", for example:
> 
> > m <- data.frame (matrix (0, nrow=2, ncol=2))
> > names (m) <- c("prev", "next")
> > m
>   prev next
> 1    0    0
> 2    0    0
> 
> But "next" being reserved prevents $ indexing without quotes:
> 
> > m$next
> Error: syntax error
> > m$"next"
> [1] 0 0
> 
> Although they are mostly obvious, I can't find in the documentation
> (using Jon Baron's searcher, at least) a list of these words.  Am I
> missing the documentation, or could such a list be added to a future
> release?
> 
> thanks,
> Denis
> 
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> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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