Thank you, I did not even think of wrapping in ( ) for the ':=" scenario.
Feeling a bit silly about that.
Just fooling around I did discover that dt[, "new.var" := fun(var), by =
something] does work.
For some reason I had been wrapping that (go figure), i.e. dt[, .("new.var"
:= fun(var)), by = something] and that just gave error messages. Two ways
to do it and I choose the wrong one both times.
Sincerely appreciate the help
Carl Sutton
-----
Carl Sutton
--
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