R-Devel:
When I get the data part of an S4 class that contains="data.frame", it gives
me a list, even when the "data.frame" is the S4 version:
> d<-data.frame(x=1:3)
> isS4(d)
[1] FALSE # of course
> dS4<-new("data.frame",d)
> isS4(dS4)
[1] TRUE # ok
> class(dS4)
[1] "data.frame" # good
attr(,"package")
[1] "methods"
> setClass("A", representation(label="character"), contains="data.frame")
[1] "A"
> a<-new("A",dS4, label="myFrame")
> getDataPart(a)
[[1]] # oh?
[1] 1 2 3
> class([email protected])
[1] "list" # hmm
> names(a)
[1] "x" # sure, that makes sense
> a
Object of class "A"
x
1 1
2 2
3 3
Slot "label":
[1] "myFrame"
Was I wrong to have expected the "data part" of 'a' to be a "data.frame"?
Thanks.
Dan Murphy
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