[Rd] A strange behaviour of file.path in Windows? (PR#13119)
Prof Brian Ripley
ripley at stats.ox.ac.uk
Fri Oct 3 13:02:39 CEST 2008
On Fri, 3 Oct 2008, pego.enrico at tiscali.it wrote:
> Full_Name: Enrico Pegoraro
> Version: 2.7.2
> OS: Windows (Vista or Xp PRO) Italian
> Submission from: (NULL) (220.127.116.11)
> If you send these lines of code:
> R replies correctly:
>  "c:/pippo/pluto.html"
> But if you change the first steps to:
> R replies (uncorrectly, I think)
>  "/c:/pippo/pluto.html"
Not for me! I get
which is as documented, hence correct. Furthermore, the code cannot
possibly give your answer unless 'c:/pippo' has some special status on
your system, and you haven't told us anything about that.
If you do
file.path("", "c:/pippo", "pluto.html")
you get what you indicate, but that is user error (an empty server/share
> This problem influence the R2HTML package too, which, if you send a line as:
> targetHtml=HTMLInitFile(outdir="",filename="htmlFile",Title ="Title")
> in windows it submit an error because of file.path() error.
It will affect any such misuse of file.path, of course. It really is not
a good idea to use empty file path elements, especially on Windows[*].
If you mean the current directory, use ".".
[*] On Unix // is equivalent to /. On Windows \\ or // may have a special
meaning (a share) or be regarded as invalid. A trailing / or \ can be
> Thank you
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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