[R] deparse, substitute and S4 generics

[Michał Bojanowski]

Hello Bill,

Thanks! Indeed that works. Can you give me a hunch why?
Does it have anything to do with environments and scope?

~michal



Bill.Venables wrote:
> 
> Try putting a ... argument in the method for g as well
> 
> setGeneric("g", function(object, ...) standardGeneric("g"))
> 
> setMethod("g", "ANY",
> function(object, ...)  ### change
> {
>     nam <- deparse(substitute(object))
>     cat("name:", nam, "\n")
>     object
> } ) 
> 
> 
> Now it works.
> 
> Bill Venables
> CSIRO Laboratories
> PO Box 120, Cleveland, 4163
> AUSTRALIA
> Office Phone (email preferred): +61 7 3826 7251
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> mailto:Bill.Venables at csiro.au
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> 
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> On Behalf Of Bojanowski, M.J. (Michal)
> Sent: Wednesday, 23 January 2008 9:48 AM
> To: r-help at r-project.org
> Subject: [R] deparse, substitute and S4 generics
> 
> Hello everyone,
> 
> I encountered the following confusing behavior of 'deparse' and
> 'substitute' while programming with S4 classes (see example below). It
> seems like the presence of '...' argument in the definition of the
> generic generates the problem. I have no clue why, can anyone explain
> that to me? Are there any "workarounds"?
> 
> Thanks a lot for your time!
> 
> ~Michal
> 
> 
> 
> # Let's define two seemingly identical generics
> 
> setGeneric("f", function(object) standardGeneric("f"))
> 
> setMethod("f", "ANY",
> function(object)
> {
>     nam <- deparse(substitute(object))
>     cat("name:", nam, "\n")
>     object
> } )
> 
> # and
> 
> setGeneric("g", function(object, ...) standardGeneric("g"))
> 
> setMethod("g", "ANY",
> function(object)
> {
>     nam <- deparse(substitute(object))
>     cat("name:", nam, "\n")
>     object
> } )
> 
> 
> 
> # now let's test:
> 
> x <- 1
> 
> # this works
> f(x)
> 
> # but this does not,  why? what '...' has to do with it?
> g(x)
> 
> 
> 
> ____________________________________
> Michal Bojanowski
> ICS / Department of Sociology
> Utrecht University
> Heidelberglaan 2; 3584 CS Utrecht
> The Netherlands
> m.j.bojanowski at uu dot nl
> http://www.fss.uu.nl/soc/bojanowski/
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
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> PLEASE do read the posting guide
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> 
> ______________________________________________
> R-help at r-project.org mailing list
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
> 
> 


-----
____________________________________
Michal Bojanowski
ICS / Department of Sociology
Utrecht University
Heidelberglaan 2; 3584 CS Utrecht
The Netherlands
m.j.bojanowski at uu dot nl
http://www.fss.uu.nl/soc/bojanowski/
http://bojan.3e.pl
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