I just obtained the latest release of data.table, and immediately went to see
what's new. The help on := was just what I was looking for. It cleared up
things nicely for me, the RHS/LHS issue was very helpful, and the examples were
the usual good stuff--simple, and they get a variety of ideas across succinctly.
Minor note:
DT[a>"A",b:=d*2L] # subassign to b using d where a>"A"
does not work: a is a factor, not character.
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