>>>>> Hadley Wickham <h.wick...@gmail.com>
>>>>> on Sun, 20 Sep 2015 14:23:43 -0400 writes:
> The problem is that within.data.frame calls as.list.environment with
> the default value of all.names = FALSE. I doubt this is a deliberate
> feature, and is more likely to be a minor oversight.
Indeed;
Thank you, Hadley (and Brian)!
It is fixed now in R-devel .... and will be ported to R-patched
probably tomorrow.
Martin
> Hadley
> On Sun, Sep 20, 2015 at 11:49 AM, Brian <zenli...@gmail.com> wrote:
>> Dear List,
>>
>> Somewhere I missed something, and now I'm really missing something!
>>
>>> d.f <- data.frame(.id = c(TRUE, FALSE, TRUE), dummy = c(1, 2, 3), a =
>> c(1, 2, 3), b = c(1, 2, 3) + 1)
>> > within(d.f, {d = a + b})
>> dummy a b d
>> 1 1 1 2 3
>> 2 2 2 3 5
>> 3 3 3 4 7
>> > d.f <- data.frame(.id = c(TRUE, FALSE, TRUE), .dummy = c(1, 2, 3), a
>> = c(1, 2, 3), b = c(1, 2, 3) + 1)
>> > within(d.f, {d = a + b})
>> a b d
>> 1 1 2 3
>> 2 2 3 5
>> 3 3 4 7
>>
>> Could somebody please explain to me why this does this? I think could be
>> considered a feature (for lots of calculations within a data frame you
>> don't have to remove all extra variables at the end). I just wish it
>> was documented.
>>
>> Cheers,
>> Brian
>>
>>
>> sessionInfo()
>> R version 3.1.0 (2014-04-10)
>> Platform: x86_64-pc-linux-gnu (64-bit)
>>
>> locale:
>> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
>> [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
>> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
>> [7] LC_PAPER=en_US.UTF-8 LC_NAME=C
>> [9] LC_ADDRESS=C LC_TELEPHONE=C
>> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>>
>> attached base packages:
>> [1] splines grid stats graphics grDevices utils datasets
>> [8] methods base
>>
>> other attached packages:
>> [1] scales_0.2.4 plyr_1.8.3 reshape2_1.4
>> ccchDataProc_0.7
>> [5] ccchTools_0.6 xtable_1.7-4 tables_0.7.79 Hmisc_3.14-5
>> [9] Formula_1.1-2 survival_2.37-7 ggplot2_1.0.1
>> IDPmisc_1.1.17
>> [13] lattice_0.20-29 myRplots_1.1 myRtools_1.2
meteoconv_0.1
>> [17] pixmap_0.4-11 RColorBrewer_1.0-5 maptools_0.8-30 sp_1.1-1
>> [21] mapdata_2.2-3 mapproj_1.2-2 maps_2.3-9
chron_2.3-45
>> [25] MASS_7.3-35
>>
>> loaded via a namespace (and not attached):
>> [1] acepack_1.3-3.3 cluster_1.15.2 colorspace_1.2-4
>> [4] compiler_3.1.0 data.table_1.9.4 digest_0.6.4
>> [7] foreign_0.8-61 gtable_0.1.2 labeling_0.3
>> [10] latticeExtra_0.6-26 munsell_0.4.2 nnet_7.3-8
>> [13] proto_0.3-10 Rcpp_0.12.0 rpart_4.1-8
>> [16] stringr_0.6.2 tools_3.1.0
>> > within
>> function (data, expr, ...)
>> UseMethod("within")
>> <bytecode: 0x26d32c8>
>> <environment: namespace:base>
>>
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
> --
> http://had.co.nz/
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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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