Le 2011-08-15 à 19:06, Duncan Murdoch a écrit :
> On 11-08-15 2:42 PM, Denis Chabot wrote:
>> Hi,
>>
>> I usually do not give second thought to accented vowels and R handles
>> everything fine thanks to UTF8 being used in my R scripts. But today I have
>> a problem. Accented vowels do not behave properly when they were imported
>> into R using list.files.
>>
>> Maybe this is because OS X (I'm using 10.6.8) still uses MacRoman for file
>> names, though visually the names seem to have been read correctly into R.
>>
>> An example is better than words:
>>
>> sessionInfo()
>> R version 2.13.1 (2011-07-08)
>> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>>
>> locale:
>> [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8
>>
>> attached base packages:
>> [1] stats graphics grDevices utils datasets methods base
>>
>>
>> This does not cause problem:
>> a = c("1_MO2 crevettes po2crit.Rda", "1_MO2 soles Sète sda.Rda", "1_MO2
>> turbots po2crit.Rda"); a
>> [1] "1_MO2 crevettes po2crit.Rda" "1_MO2 soles Sète sda.Rda" "1_MO2
>> turbots po2crit.Rda"
>>
>> a2 = gsub(" Sète", "S", a); a2
>> [1] "1_MO2 crevettes po2crit.Rda" "1_MO2 solesS sda.Rda" "1_MO2
>> turbots po2crit.Rda"
>>
>>
>> but if instead of creating the vector within the R script, I read it as a
>> series of file names, the substitution does not work. I am sorry that I
>> cannot make this a reproducible example as it requires the 3 files to exist
>> on your computer, but you could create 3 dummy files having the same names
>> in the directory of your choice.
>>
>> don = file.path("données/")
>> b = list.files(path = don, pattern = "1_MO2"); b
>> [1] "1_MO2 crevettes po2crit.Rda" "1_MO2 soles Sète sda.Rda" "1_MO2
>> turbots po2crit.Rda"
>>
>> b2 = gsub(" Sète", "S", b); b2
>> [1] "1_MO2 crevettes po2crit.Rda" "1_MO2 soles Sète sda.Rda" "1_MO2
>> turbots po2crit.Rda"
>>
>> I am puzzled and also "stuck". For now I'll modify the file name, but I need
>> to be able to handle such names at some point.
>>
>> Any advice?
>
>
> Possibly your system really is using MacRoman or some other local encoding;
> in that case, iconv(x, "", "UTF-8") should convert from the local encoding to
> UTF-8.
>
> I think declaring everything to be UTF8 may be sufficient. When I use
> list.files(), I see the encoding listed as "unknown", but
>
> x <- list.files()
> Encoding(x) <- "UTF-8"
>
> works. However, the iconv() method should be safer.
>
> Duncan Murdoch
Hi Duncan,
iconv() confirmed what I suspected: there was no problem with the encoding of
the result of list.files, and if there had been one, the "è" would not have
looked like a "è". Therefore, I got nonsense when treating this "è" as MacRoman
to be converted into UTF-8:
iconv(b, from="MacRoman", to="UTF-8")
[1] "1_MO2 crevettes po2crit.Rda" "1_MO2 soles SeÃÄte sda.Rda" "1_MO2 turbots
po2crit.Rda"
It is not clear however that R considered b to be UTF=8:
Encoding(b)
[1] "unknown" "unknown" "unknown"
so I followed your suggestion:
Encoding(b) <- "UTF-8"
Encoding(b)
[1] "unknown" "UTF-8" "unknown"
but gsub still did not work:
b2 = gsub(" Sète", "S", b); b2
[1] "1_MO2 crevettes po2crit.Rda" "1_MO2 soles Sète sda.Rda" "1_MO2 turbots
po2crit.Rda"
I do not know why gsub worked with example "a" but not "b" in the example shown
in my original message. Strange and frustrating.
Denis
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