[R] Catenating factors.

[Rolf Turner]

I was recently asked by one of new colleagues how to combine, or catentate,
or concatentate two factors.  If x and y are factors, doing c(x,y) appears
to coerce x and y to numeric mode before catenating them.  So what does one
do if one wants the result to be a factor whose levels are the union of the
levels of x and y?  I vaguely recall seeing this discussed in r-help, but I
can't find anything on it there, nor in the FAQ.

Am I missing something obvious?

                    cheers,

                        Rolf
                        r.turner at auckland.ac.nz




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