joining columns as in a relational database

Marc Schwartz <MSchwartz@medanalytics.com> writes:

On Tue, 2003-06-24 at 18:07, Douglas Bates wrote:

Several questions:

 - Am I duplicating existing functionality?

...

Prof. Bates,

Perhaps I am not seeing all of the details but a quick (perhaps too
quick) review would suggest that merge(), which is in base, would at
least be a parallel function.

No, you are seeing better than I.  I had not thought to look up merge
- I only thought of join.  I can use merge.  The answer to my first
question is that I am duplicating functionality.

It was an interesting exercise.  Thanks for pointing out merge.