On 26/02/2013 10:30, Patrick Burns wrote:
Is it on purpose that `[[` strips the
names when used on an atomic vector?
Yes, and documented! It does when used on a list, so is consistent.
‘"[["’ can be used to select
a single element _dropping_ ‘names’, whereas ‘"["’ keeps them,
e.g., in ‘c(abc = 123)[1]’.
> c(a=1, b=2)[1]
a
1
> c(a=1, b=2)[[1]]
[1] 1
> sessionInfo()
R Under development (unstable) (2013-02-11 r61902)
Platform: x86_64-w64-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United Kingdom.1252
[2] LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Brian D. Ripley, rip...@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 272595
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