Re: [Rd] namespace crash on S3method("as.ff",function)

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Mon, 05 Nov 2007 08:36:53 -0500

On 11/5/2007 7:41 AM, Jens Oehlschlägel wrote:
> Dear all,
>
> I have defined a generic as.ff(x, ...) and a method as.ff.function(x, ...) which converts a standard R function x into a chunked version operating on large ff objects. Everything works fine, but when registering
>
> S3method("as.ff",function)
>
> in NAMESPACE, the installation fails with some kind of parsing error:
>
> adding build stamp to DESCRIPTION
> installing NAMESPACE file and metadata
> Fehler in parse(nsFile) : Unerwartetes ')' bei
> 348:
> 349: S3method("as.ff",function)
> Calls: <Anonymous> -> parseNamespaceFile -> parse
> Ausf³hrung angehalten
> make[2]: *** [nmspace] Error 1
> make[1]: *** [all] Error 2
> make: *** [pkg-ff] Error 2
> *** Installation of ff failed ***
>
> Is this a bug? Any ideas?

"function" is a reserved keyword for the parser. Even though you don't execute a NAMESPACE file, it's parsed by the standard parser, and that's causing the problem. (You couldn't have a function call that looked like that without a parse error, either.)

I don't have time to explore this today, but what I'd do is try

S3method("as.ff", `function`)

or

S3method("as.ff","function")

first, and if those don't fix it and you don't get a better suggestion, then report this as a design bug.

Duncan Murdoch

> Best regards
>
>
> Jens
>
>
> P.S. with as.ff() we can do things like
> ffx <- as.ff(x) # as.ff.default() turns a standard R object into an ff object stored on disk
> as.ff(log)(ffx) # as.ff.function() turns 'log' into a function that we can call on ffx: taking the log of an almost arbitrarily large object
>
>
>> version
> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 6.0
> year 2007
> month 10
> day 03
> svn rev 43063
> language R
> version.string R version 2.6.0 (2007-10-03)
>



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