[datatable-help] [J(channel) , ] [J(chan) , ] give different results when chan=channel

[Dieter Menne]

Thank, Matthew, 

.() is a good idea, it is more intuitive than J() (why join?) or list () . I
am not so sure about the ..(). It's certainly intuitive, but thinking about
how to explain that feature to students is a nightmare.

Probably a feature such as you find it in plyr::join would be good: It print
a text ´"joining by: id' that reminds you that you better tell explicitly
what "by" is. So in my case: since there is a ambiguity in "channel", a
warning should be printed, with a recommendation to use ..() or .(). 

Eats performance, though, but probably only for small problem which anyway
are irrelevant.

Dieter




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