Thanks to Professors Ripley and Dalgaard for explaining the problem.
In this case, I actually looked at the help page for "sort" but
didn't see an option in the argument string that suggested a source for
the problem: I saw no argument like locale=getOption('locale'). I
fixed the problem, as suggested, by sorting the theoretical answer
before stopifnot(all.equal(...)).
Thanks again,
Spencer Graves
On 7/10/2011 12:03 AM, peter dalgaard wrote:
On Jul 10, 2011, at 05:44 , Spencer Graves wrote:
Hello:
sort(c('A', 'b', 'C')) seems to produce different answers in R interactive than in
"R CMD check", at least under both Fedora 13 and Windows 7 with Windows 7
sessionInfo() copied below:
In interactive, the result is c('A', 'b', 'C'); with R CMD check, it is c('A',
'C', 'b'). This produced the infelicity of a bug in "R CMD check" that I could
not replicate with interactive R because a *.Rd file contained the equivalent example of
stopifnot(all.equal(sort(c('A', 'b', 'C')), c('A', 'b', 'C'))): It worked just fine
interactively but failed R CMD check.
Once I understood this problem, it was easy to fix. However, it was not
easy to find, especially since I got the same problem under Fedora 13 Linux and
Windows 7.
This seems to be a sufficiently obscure anomaly that I thought someone
might like to see it reported here.
Well, the problem is here:
[snip]
locale:
[1] LC_COLLATE=English_United States.1252
==========================================
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
All checks in R (unless we overlooked some) run with LC_COLLATE=C, because otherwise they give different results in
different locales. One notorious example is that people expect that a file or an object called "zzz" comes
out last in a sort, but Estonian sorts "z" between "s" and "t"...
Notice that your .Rd example would, for the same reason, break for people with
different locale settings.
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