[R] NA/NULL slot for a class defined with 'methods'

[Laurent Gautier]

Dear all,


I would like to signify that a slot of mode "array"
is undefined and I thought that array(), or NA or NULL
would be good choices...

The following examples leave me puzzled:
 
> setClass("test", representation(x="array"))
[1] "test"
> new("test")
An object of class "test"
Slot "x":
numeric(0)

> new("test", x=array())
An object of class "test"
Slot "x":
[1] NA

> new("test", x=NA)
Error in initialize(value, ...) : Invalid object for slot "x", with class "logical", should be or extend class "array"



Is there a way to do it ?


Regards,


Laurent


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Laurent Gautier			CBS, Building 208, DTU
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