[R] Defining class as a member of another class

[Martin Morgan]

Gabor Grothendieck wrote:
> Try this:
> 
>> setClass("zoo")
> [1] "zoo"

'zoo' is I guess intended as an S3 class (from library zoo), so
setOldClass('zoo') is appropriate. Otherwise, setClass("zoo") creates a
new virtual class.

>> setClass("Work",representation=(x="zoo"))

This syntax representation=(x="zoo") is doing something quite strange;
the correct syntax to create a class with a slot 'x' of type 'zoo' is

  setClass("Work", representation=c(x="zoo"))

or better

  setClass("Work", representation=representation(x="zoo"))

On the other hand to extend the 'zoo' class

  setClass("Work", representation=representation("zoo"))

or

  setClass("Work", contains="zoo")

getClass("Work") after each of the above shows the consequences.

Martin

> [1] "Work"
> 
> 
> On Sat, Jun 27, 2009 at 10:01 PM, R_help Help<rhelpacc at gmail.com> wrote:
>> Hi,
>>
>> When I define a new class (through setClass), members defined in
>> representation argument doesn't seem to like a class. For example, if
>> I do the following:
>>
>> setClass("NotWork",representation=(x="zoo"))
>>
>> It seems to me that representation members will take in only primitive
>> type to R. Is there any way to stuff a class as a member in another
>> class? Thank you.
>>
>> - adschai
>>
>> ______________________________________________
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>>
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.