Bill:
Is there some reason to prefer your "odd idiom" to match.call, perhaps
as as.list(match.call()), as proposed by Hadley?
-- Bert
On Mon, Jul 23, 2012 at 2:25 PM, William Dunlap <wdun...@tibco.com> wrote:
> list(...) evaluates the things in ...
> E.g.,
> > f0 <- function(x, ...) list(...)
> > f0(1, warning("Hmm"), stop("Oops"), cat("some output\n"))[[2]]
> Error in f0(1, warning("Hmm"), stop("Oops"), cat("some output\n")) : Oops
> In addition: Warning message:
> In f0(1, warning("Hmm"), stop("Oops"), cat("some output\n")) : Hmm
>
> You can use the odd idiom substitute(...()) to get the unevaluated ...
> arguments:
> > f1 <- function(x, ...) substitute(...())
> > f1(1, warning("Hmm"), stop("Oops"), cat("some output\n"))
> [[1]]
> warning("Hmm")
>
> [[2]]
> stop("Oops")
>
> [[3]]
> cat("some output\n")
>
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>
>> -----Original Message-----
>> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
>> Behalf Of S Ellison
>> Sent: Monday, July 23, 2012 2:12 PM
>> To: Jochen Voß
>> Cc: r-help@r-project.org
>> Subject: Re: [R] turning R expressions into functions?
>>
>> >> One of the things I would love to add to my package would be the
>> >> ability to compare more than two expressions in one call. But
>> >> unfortunately, I haven't found out so far whether (and if so, how) it
>> >> is possible to extract the elements of a "..." object without
>> >> evaluating them.
>> >
>> >Have a look at match.call.
>>
>> ... or use
>> dotlist <- list(...)
>>
>> to get a list of everything included in ...
>>
>> S Ellison
>>
>> *****************************************************************
>> **
>> This email and any attachments are confidential. Any use...{{dropped:8}}
>>
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>
> ______________________________________________
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--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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