From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>

Date: Tue, 04 Mar 2008 06:58:08 +0000 (GMT)

Date: Tue, 04 Mar 2008 06:58:08 +0000 (GMT)

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: hedbag_at_gmail.com
**> email2: allth025_at_student.otago.ac.nz
**> Work: (+64)3 479 5123
**> Mobile: 027 321 4269
**>
**> ______________________________________________
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**> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
**> and provide commented, minimal, self-contained, reproducible code.
**>
*

-- Brian D. Ripley, ripley_at_stats.ox.ac.uk 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 272595Received on Tue 04 Mar 2008 - 07:02:02 GMT______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.

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