Hi Alex,
As far as I know, that's the best solution. In roxygen, I've wrapped
it up with a couple of helpers:
set_collate <- function(locale) {
cur <- Sys.getlocale(category = "LC_COLLATE")
Sys.setlocale(category = "LC_COLLATE", locale = locale)
cur
}
with_collate <- function(locale, code) {
old <- set_collate(locale)
on.exit(set_collate(old))
force(code)
}
sort_c <- function(x) with_collate("C", sort(x))
Hadley
On Fri, Sep 18, 2015 at 4:25 PM, Alex Deckmyn <alex.deck...@meteo.be> wrote:
> Hi,
>
> For an update of the maps package, I have run into a bug caused by the
> locale-depent behaviour of order().
> In a certain function, the polygon names of the world map are lexically
> sorted with order() prior to being sent to a C routine. That routine expects
> them to be sorted according to ASCII rules, but that is not the result I get.
> The main culprit is the colon used to identify sub-regions. For instance, in
> my locale (en_GB_UTF-8), I get
>
> "uk:northen ireland" < "ukrain" < "uk:scotland"
>
> which is not the order expected by C. I guess some language settings would
> also cause other unexpected results.
>
> Apart from the pain of fixing uk/ukrain ambiguities, is there a safe way to
> fix this order() in a package? An obvious solution seems to be
>
> lcc <- Sys.getlocale("LC_COLLATE")
> Sys.setlocale("LC_COLLATE","C")
> ord.nam <- order(nam)
> Sys.setlocale("LC_COLLATE",lcc)
>
> This seems to work fine on my linux PC, but I am not sure about other
> platforms (Windows, OS-X...), though the "C" locale should be standard. Is
> this safe? Or is there a better way to get the right ordering?
>
> Alex
>
> ---
> Dr. Alex Deckmyn e-mail: alex.deck...@meteo.be
> Royal Meteorological Institute http://www.meteo.be
> Ringlaan 3, 1180 Ukkel, Belgium tel. (32)(2)3730646
>
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>
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