xtabs and NA

On Mon, Feb 9, 2015 at 8:52 AM, Kirill M?ller
<kirill.mueller at ivt.baug.ethz.ch> wrote:
Passing table the output of model.frame would still allow the use of a 
formula interface:

mf <- model.frame( ~ data, na.action = na.pass)
do.call("table", c(mf, useNA = "ifany"))

    a    b    c <NA>
    1    1    1    1

Fair enough, this qualifies as a workaround, and IMO this is how xtabs 
should handle it internally to allow writing xtabs(~data, na.action = 
na.pass) -- or at least xtabs(~data, na.action = na.pass, exclude = 
NULL) if backward compatibility is desired. Would anyone with write 
access to R's SVN repo care enough about this situation to review a 
patch? Thanks.


-Kirill