Message-ID: <4CA7311A.1000304@gmail.com>
Date: 2010-10-02T13:18:18Z
From: Duncan Murdoch
Subject: Eval and the enclos argument
In-Reply-To: <AANLkTinQ8fXByLEkJqCFOr9i4Q5KNSnf2cfAD0vBJy-6@mail.gmail.com>
On 02/10/2010 7:57 AM, Hadley Wickham wrote:
> Hi all,
>
> I'm trying to understand the default value of the enclos argument of eval:
>
> enclos = if(is.list(envir) || is.pairlist(envir)) parent.frame()
> else baseenv()
>
> Why isn't it just
>
> enclos = parent.frame()
>
> given that enclos is only meaningful (given my reading of the
> documentation) when envir is not an environment already.
>
> Hadley
>
I think that handles the case of envir=NULL.
Duncan Murdoch