On Tue, 4 Mar 2008, Thomas Allen wrote:
Hi
I came across this strange bug the other day, I'm not sure how to solve it
and I wonder if anyone can even replicate it.
Using OS Ubuntu 7.10
Step 1) Make an R package using the package.skeleton() command with
only these two functions:
error <- function(){
cmd <- paste(" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,
" –a ",1,sep="")
cat(cmd,"\n")
}
noerror <- function(){
cmd <- paste(" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,
" -a ",1," -a ",1," -a ",1,sep="")
cat(cmd,"\n")
}
Step 2) Start R again. Load the package with library() and run the commands:
error()
noerror()
I get the following output:
library(errors)
error()
-a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 <e2><80><93>a 1
noerror()
-a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1 -a 1
Now why does that "<e2><80><93>" replace one of the "-" in the first command?
Because you put it there! I believe that at the first step you were
running R in a UTF-8 locale, and at the second in (probably) an 8-bit
locale. I can reproduce this by changing from en_GB.utf8 to en_GB on F8,
for example.
<e2><80><93> is UTF-8 for the Unicode point U+2013, the en dash. I don't
know how you managed to enter that in UTF-8 (I would have not have
expected it to be accidentally possible from the keyboard), but the
solution is to use hyphen where you intend hyphen. (Unicode calls this
'HYPHEN-MINUS' to indicate its dual role -- it also has U+2212 for minus.)
Any ideas?
Cheers
Tom
--
Thomas Allen
Department of Biochemistry
University of Otago
email1: [EMAIL PROTECTED]
email2: [EMAIL PROTECTED]
Work: (+64)3 479 5123
Mobile: 027 321 4269
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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