Dear all,
I have the impression that the function invalid from gtools is not
really working as I would expect it to do for factors:
Browse[1]> invalid(as.factor(NA))
[1] FALSE
Browse[1]> invalid(as.numeric(NA))
[1] TRUE
I would exptect that
> invalid(as.factor(NA))
is also TRUE.
Maybe this should be changed in a consistent way which also works in
similar cases for other classes.
One could possibly use
> else return(all(is.na(as.vector(x))))
Any better suggestions?
Best regards,
Stefan
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