(Ted Harding) <[EMAIL PROTECTED]> writes:
> Hi Folks,
> Can someone satisfy my curiosity (well, at least about
> the following query!)
>
> Reading the draft proofs of an article I've been asked
> to look through, I find the typesetter has set what
> would normally be entered as
>
> source("xyz.R") or source('xyz.R')
>
> as
>
> source(`xyz.R')
>
> i.e. it has come out with an opening backquote, then
> xyz.R, then a closing forward quote. I suspect the
> intervention of "intelligent" software (à la Word's
> "clever quotes").
>
> Well, the cure is clear and I'm not asking about that.
> But I got curious about what role the backquote might
> play in R syntax (if any). As a start I tried typing
> that in as it stands:
>
> source(`xyz.R')
> ## and then you get the "continuation +" as if it were
> ## incomplete, so I tried a closing parenthesis:
> + )
> Error: unprotect_ptr: pointer not found
>
> So it wasn't a mere syntax error (which would have caused
> an error message saying just that) -- using the backquote
> caused R to try to do something.
>
> So now I'm wondering what the effect of "`" is, in R.
>
> Statutory Declaration: I have performed an R Site Search
> for "backquote" obtaining 9 hits none of which seems to
> address this question.
?Quotes should put you straight. (And help.search("`") gets you there,
as does help.search("backtick"), although not help.search("back
quote"))
--
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c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
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