Try this:
x...@y
On Thu, Feb 25, 2010 at 11:12 PM, Zhang,Yanwei <yanwei.zh...@cna.com> wrote:
>
> Dear all,
>
> I'm new to S4 classes and have a question on this. I want to use S4 because I
> want to define explicitly the slots that the new class can have. But other
> than that, the new class behaves exactly like a list. But this will not allow
> me to use the generic functions that are already defined for class "list",
> such as "$", "c", "[[", "names" or "length".
>
> For example, I defined a new class "abc", and tried to use "$", "length", and
> "[[", but they do not work (which is shown below). I know I could define
> these methods for the new class, but is there an easy way to allow this new
> class to inherit all the functions that work for class "list"? I tried to
> use contains="list", but this does not work either. Thanks for any help.
>
>> setClass("abc", representation(x="numeric",y="character",z="numeric"))
> [1] "abc"
>> xxx=new("abc",x=1,y="a",z=2)
>> xxx$a
> Error in xxx$a : $ operator not defined for this S4 class
>> length(xxx)
> [1] 1
>> xxx[[1]]
> Error in xxx[[1]] : this S4 class is not subsettable
>
>
>
> Wayne (Yanwei) Zhang
> Statistical Research
> CNA
>
>
>
>
>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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