This is a known Mac OS X bug, nothing to do with R which uses the system
functions (strcoll/wcscoll) for such things.
If you look at the help for sort, it refers you to ?Comparison. Which
says
Comparison of strings in character vectors is lexicographic within
the strings using the collating sequence of the locale in use: see
'locales'. The collating sequence of locales such as 'en_US' is
normally different from 'C' (which should use ASCII) and can be
surprising. Beware of making _any_ assumptions about the
collation order: e.g. in Estonian 'Z' comes between 'S' and 'T',
and collation is not necessarily character-by-character - in
Danish 'aa' sorts as a single letter, after 'z'. Some platforms
may not respect the locale and always sort in ASCII. (String
comparison is always for the part of the string up to the first
nul if there are embedded nuls.)
Mac OS X (more specifically, 10.5.2 on i386) is one of those disrespectful
platforms.
x <- intToUtf8(c(32:127, 160:255), multiple=T)
order(x)
[1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18
[19] 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
36
[37] 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
54
[55] 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
72
[73] 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
90
[91] 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
108
[109] 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
126
[127] 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
144
[145] 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
162
[163] 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
180
[181] 181 182 183 184 185 186 187 188 189 190 191 192
which is quite different from Linux or Solaris. This may not come out,
but paste(sort(x), collapse="") includes
aAªáÁàÀâÂåÅäÄãÃæÆbBcCçÇdDeEéÉèÈêÊëË
on Linux in es_ES.utf8 .
Platforms are a lot worse at sorting in UTF-8 than 8-bit encodings. Mac
OS X has es_ES.ISO8859-15, and that does do a reasonable job including
aáàâåäãæ .
On Tue, 15 Apr 2008, [Ricardo Rodriguez] Your XEN ICT Team wrote:
Hi all,
In Spanish vowels with accent like á, é, ... doesn't affect to the
alphabetical order of vector of strings. I mean, a or á don't matter for
establishing the alphabetical order.
Nevertheless, while working with R order, here is what I get.
Given a file transport.txt
medio#variable
avión#34
barco#33
bicicleta#3
ángulo#37
camión#54
coche#23
tren#67
> toPlot <-
read.csv("~/Desktop/Workplace/transport.txt",header=TRUE,sep="#")
> toPlot[order(toPlot$medio),]
medio variable
1 avión 34
2 barco 33
3 bicicleta 3
5 camión 54
6 coche 23
7 tren 67
4 ángulo 37
>
I expect ángulo appears in the first place as n (in ángulo) goes before
v (in avión) and á/a doesn't matter for alphabetical order.
But ángulo appears in the last position.
Here my environment:
> sessionInfo()
R version 2.7.0 beta (2008-04-12 r45280)
i386-apple-darwin9.2.2
locale:
es_ES.UTF-8/es_ES.UTF-8/C/C/es_ES.UTF-8/es_ES.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
> version
_
platform i386-apple-darwin9.2.2
arch i386
os darwin9.2.2
system i386, darwin9.2.2
status beta
major 2
minor 7.0
year 2008
month 04
day 12
svn rev 45280
language R
version.string R version 2.7.0 beta (2008-04-12 r45280)
>
Is it not possible to get this dataframe ordered correctly in Spanish?
Other programs (Excel, for instance) do order correctly.
Thanks for your help,
Ricardo
--
Ricardo Rodríguez
Your XEN ICT Team
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and provide commented, minimal, self-contained, reproducible code.
--
Brian D. Ripley, [EMAIL PROTECTED]
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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and provide commented, minimal, self-contained, reproducible code.
