[Rd] bug in rank(), order(), is.unsorted() on character vector

[Joris Meys]

@Barry : regardless of whether '_' comes before or after '1' , it
should be consistent. Adding an 'a' shouldn't shift '_' from before
'1' to between '1' and '2', that's clearly an error. The help files
are not stating anything about that. The only thing I can imagine, is
that '_' gets ignored (in that case 19a would rank before 1a).

This said, I can't reproduce.

> x <- c("_1_", "1_9", "2_9")
> xa <- paste(x,'a',sep='')
> rank(x)
[1] 1 2 3
> rank(xa)
[1] 1 2 3

> sessionInfo()
R version 2.14.0 Patched (2006-00-00 r00000)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United
States.1252

attached base packages:
[1] grDevices datasets  splines   graphics  stats     tcltk     utils
   methods   base

other attached packages:
[1] svSocket_0.9-51 TinnR_1.0.3     R2HTML_2.2      Hmisc_3.8-3
survival_2.36-9

loaded via a namespace (and not attached):
[1] cluster_1.14.1  grid_2.14.0     lattice_0.19-33 svMisc_0.9-63
tools_2.14.0


2011/12/7 Hervé Pagès <hpages at fhcrc.org>:
> Hi,
>
> This looks OK:
>
>> x <- c("_1_", "1_9", "2_9")
>> rank(x)
> [1] 1 2 3
>
> But this does not:
>
>> xa <- paste(x, "a", sep="")
>> xa
> [1] "_1_a" "1_9a" "2_9a"
>> rank(xa)
> [1] 2 1 3
>
> Cheers,
> H.
>
>> sessionInfo()
> R version 2.14.0 (2011-10-31)
> Platform: x86_64-unknown-linux-gnu (64-bit)
>
> locale:
>  [1] LC_CTYPE=en_CA.UTF-8       LC_NUMERIC=C
>  [3] LC_TIME=en_CA.UTF-8        LC_COLLATE=en_CA.UTF-8
>  [5] LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_CA.UTF-8
>  [7] LC_PAPER=C                 LC_NAME=C
>  [9] LC_ADDRESS=C               LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> loaded via a namespace (and not attached):
> [1] tools_2.14.0
>
>
> --
> Hervé Pagès
>
> Program in Computational Biology
> Division of Public Health Sciences
> Fred Hutchinson Cancer Research Center
> 1100 Fairview Ave. N, M1-B514
> P.O. Box 19024
> Seattle, WA 98109-1024
>
> E-mail: hpages at fhcrc.org
> Phone:  (206) 667-5791
> Fax:    (206) 667-1319
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics

tel : +32 9 264 59 87
Joris.Meys at Ugent.be
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