From ggrothendieck at gmail.com  Fri Feb  9 00:17:32 2007
From: ggrothendieck at gmail.com (Gabor Grothendieck)
Date: Thu, 8 Feb 2007 18:17:32 -0500
Subject: [Rd] obscure error with subsetting as.list() of a function then
	assigning that a (PR#9500)
In-Reply-To: <20070208180825.7B3D75A842@slim.kubism.ku.dk>
References: <20070208180825.7B3D75A842@slim.kubism.ku.dk>
Message-ID: <971536df0702081517y3dd0e8d4l3a791499d1953d4@mail.gmail.com>

Also note:

   missing(a) # TRUE


On 2/8/07, peter-m.schumacher at db.com <peter-m.schumacher at db.com> wrote:
>
>
> Hello. I was writing some code that computes on the language and came across
> this. I can work around it, but thought you might like to know about it.
>
> > f <- function(x) { NULL }
> > a <- as.list(f)[[1]]
> > a # ie print(a)
> Error: argument "a" is missing, with no default
>
> Note it says *argument* "a", which is strange. In fact, and unsurprisingly, the bug lies
> with the object itself, not with print():
>
> > typeof(a)
> Error in typeof(a) : argument "a" is missing, with no default
> > deparse(a)
> Error in deparse(a) : argument "a" is missing, with no default
>
> However, this does work:
> > as.list(f)[[1]]
>
> It prints nothing, which is correct, and there is no error. So it seems the bug lies with
> assigning a name to as.list(f)[[1]] as above, then trying to work with that new object.
>
> Regards,
> Peter-M.Schumacher at db.com
>
>
> --please do not edit the information below--
>
> Version:
>  platform = i386-pc-mingw32
>  arch = i386
>  os = mingw32
>  system = i386, mingw32
>  status =
>  major = 2
>  minor = 4.1
>  year = 2006
>  month = 12
>  day = 18
>  svn rev = 40228
>  language = R
>  version.string = R version 2.4.1 (2006-12-18)
>
> Windows XP Professional (build 2600) Service Pack 2.0
>
> Locale:
> LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United Kingdom.1252;LC_MONETARY=English_United Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252
>
> Search Path:
>  .GlobalEnv, file:c:/schupl/R/myRLib/.RData, package:stats, package:graphics, package:grDevices, package:utils, package:datasets, package:methods, Autoloads, package:base
> ---
>
> This e-mail may contain confidential and/or privileged infor...{{dropped}}
>
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[Rd] obscure error with subsetting as.list() of a function then assigning that a (PR#9500)
Gabor Grothendieck