Hello,
What is your sessionInfo()?
With me it works as expected:
> sort(c("-", "+"))
[1] "-" "+"
> sort(c("+", "-"))
[1] "-" "+"
> x5 <- c("+Aa","-Ab")
> sort(x5)
[1] "-Ab" "+Aa"
> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=Portuguese_Portugal.1252
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C
[5] LC_TIME=Portuguese_Portugal.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Hope this helps,
Rui Barradas
Em 08-11-2016 12:18, Pascal A. Niklaus escreveu:
I just got caught by the way in character vectors are sorted.
It seems that on my machine "sort" (and related functions like "order")
only consider characters related to punctuation (at least here the "+"
and "-") when there is no difference in the remaining characters:
> x1 <- c("-A","+A")
> x2 <- c("+A","-A")
> sort(x1) # sorting is according to "-" and "+"
[1] "-A" "+A"
> sort(x2)
[1] "-A" "+A"
> x3 <- c("-Aa","-Ab")
> x4 <- c("-Aa","+Ab")
> x5 <- c("+Aa","-Ab")
> sort(x3)
[1] "-Aa" "-Ab" # here the "+" and "-" are ignored
> sort(x4)
[1] "-Aa" "+Ab"
> sort(x5)
[1] "+Aa" "-Ab"
I understand from the help that this depends on how characters are
collated, and that this scheme follows the multi-level comparison in
unicode (http://www.unicode.org/reports/tr10/).
However, what I need is a strict left-to-right comparison of the sort
provided by strcmp or wcscmp in glibc. The particular ordering of
special characters is not so important, but there should be no
"multi-level" aspect to the sorting.
Is there a way to achieve this in R?
Thanks for your help
Pascal
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