On 15/06/2014 12:16, Duncan Murdoch wrote:
On 15/06/2014, 1:15 AM, Marius Hofert wrote:
Hi,
If I use invisible(Sys.setlocale("LC_COLLATE", "C")) in ~/.Rprofile, then
sort(c("L.Y", "Lu", "L.Q"))
[1] "L.Q" "L.Y" "Lu"
whereas using invisible(Sys.setlocale("LC_COLLATE", "en_US.UTF-8")) results in
sort(c("L.Y", "Lu", "L.Q"))
[1] "L.Q" "Lu" "L.Y"
I know this issue has appeared already
(https://stat.ethz.ch/pipermail/r-help//2012-February/304089.html), I
just don't see a reason for the second output: either '.' comes before
letters, then the result should be
"L.Q" "L.Y" "Lu" or it comes afterwards, then it should be "Lu" "L.Q"
"L.Y" -- the above result thus seems inconsistent to any useful notion
of 'sort' (?)
I don't see this either, but it appears that on your platform the "." is
simply being ignored, which might be a useful kind of sorting in some
contexts.
ICU implements that:
icuSetCollate(locale="en_US", alternate_handling="shifted")
sort(c("L.Y", "Lu", "L.Q"))
See ?icuSetCollate and the references there and in ?Comparison.
--
Brian D. Ripley, rip...@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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