Dear Matthew,
data.table is a great package! Following your suggestion,
I just wanted to let you know that it would be really
great if := would work with by.
I have no clue how hard it is to implemented it
efficiently. If an efficient implementation is likely to
take some time, perhaps one could already implement a
simple workaround, like autmatically calling:
dt[,transform(.SD, newcol = expr),by=by.col]
when the user supplied
dt[,newcol := expr, by=by.col]
This would already allow to use the simpler syntax. (I
wanted to teach some students new to R how data.table
allows convenient and quick data aggregation and would
find it much easier to explain the second syntax instead
of explaining the first syntax)
Anyway, thanks to all developers for creating and
maintaining the package!
Best wishes,
Sebastian
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