Characters subsetted with NA (was: Several R vs S-Plus issues)

David Brahm writes:

Peter Dalgaard <p.dalgaard@biostat.ku.dk> wrote:

Basically, we should have a *real* NA for string variables, distinct from
the character string "NA" and propagating like any other NA's.

I could go for that.  How would it appear when cat()ed or print()ed?

I think <NA> to distinguish from "NA".

R 1.4.0 already has

    o   Printing factors with both level "NA" and missing values
        uses `<NA>' for the missing values to distinguish them.

-k
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