Typo (?) in 'aggregate.formula'

From: peter dalgaard <pdalgd at gmail.com>
Subject: Re: [Rd] Typo (?) in 'aggregate.formula'
To: "Suharto Anggono Suharto Anggono" <suharto_anggono at yahoo.com>
Cc: R-devel at r-project.org
Date: Monday, 3 September, 2012, 4:43 PM
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.

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-- 
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