tensor() function and sets

[Martin Maechler]

Excuse me Jonathan,
after looking a bit longer at your examples and some thinking,
I'm now quite convinced that  your tensor() function *IS* useful for us
and comes quite handy in several cases.
{real S/R hackers doing all this in their sleep, but most of us
 are not "real S/R hackers" in this sense ...}

I think it still would be nice to have reasonable default arguments da & db.

Martin
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