Displaying 2 results from an estimated 2 matches for "nondate".
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mondate
2019 Mar 27
0
Discrepancy between is.list() and is(x, "list")
...pposedly is of that
class.
> x = "not a date"
> class(x) = "Date"
> is(x, "Date")
[1] TRUE
> y = Sys.Date()
> y
[1] "2019-03-26"
> attr(y, "class")
[1] "Date"
> is.object(y)
[1] TRUE
> class(y) = "NonDate"
> y
[1] 17981
attr(,"class")
[1] "NonDate"
> is(y, "Date")
[1] FALSE
> inherits(y, "Date")
[1] FALSE
> And two, because class definitions can exist outside the code itself.
> e.g. As part of an object oriented model.
> (Bein...
2019 Mar 27
2
Discrepancy between is.list() and is(x, "list")
> you had seemed to be presenting it as something new in 3.5.3. I would be
surprised if the behavior doesn't go all the way back to whenever
head.function was added.
My bad.
I'm just surprised I've never noticed these problems before.
> S3 classes have no formal definitions at all
> I'm not sure what is clear about that, or what class hierarchy you're
talking about