Uwe Ligges <[EMAIL PROTECTED]> writes:
>> Point taken, but is the behavior of as.character correct?
>> as.character(list(NULL))
>> as.character(NULL)
>
>
> I thought about it quite a while. I think the current bahaviour is
> quite OK. What should as.character do in the follwing case:
> as.character(list("A", NA, NULL))
> ?
>
> Note that it only can return a character vector...!
>
> So, should it return a character vector of length 2? That's a bad
> idea, if the length is reduced.
But consistent with vectorizing a list using unlist:
unlist(list(NULL, NULL, "a"))
[1] "a"
> Moreover, as.character() does not get a NA or a NULL object for
> coercion but an element of type list that itself conatins NA or
> NULL...
In the case of NA, I think converting to "NA" should be a last
resort. Since NA is a perfectly valid element of a character vector,
it would seem to be a better choice.
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