Re: [Rd] Typo (?) in 'aggregate.formula'

From: peter dalgaard <pdalgd_at_gmail.com>
Date: Mon, 03 Sep 2012 11:43:39 +0200

This (and more) was fixed in r-devel back in May. Did you actually get bitten by this? (The code has been there for years, so it hasn't been slated for R-patched.)

-pd

On Sep 3, 2012, at 11:06 , Suharto Anggono Suharto Anggono wrote:

> In the code for 'aggregate.formula', there is
> if (as.character(formula[[2L]] == "."))
> I believe that it is meant to be
> if (as.character(formula[[2L]]) == ".")
>
> However,
> if (as.character(formula[[2L]] == "."))
> gives the expected result.
> Tracing:
> - formula[[2L]] == "."
> is equivalent to
> as.character(formula[[2L]]) == "."
> From the help page for '==' (Comparison), "Language objects such as symbols and calls are deparsed to character strings before comparison."
> - By applying 'as.character', the TRUE/FALSE result of
> formula[[2L]] == "."
> is converted to character, becomes "TRUE"/"FALSE".
> - Then, for 'if', it is implicitly converted back to logical.
>
>

>> sessionInfo()

> R version 2.14.2 (2012-02-29)
> Platform: i386-pc-mingw32/i386 (32-bit)
>
> 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
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
>
> I see that, in R 2.15.1, the code for 'aggregate.formula' is still the same.
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
-- 
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes_at_cbs.dk  Priv: PDalgd_at_gmail.com

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