R : Is there a simple way to achieve something similar to `x[,c:=mean(a), by=b]$c`?
0R : Is there a simple way to achieve something similar to `x[,c:=mean(a), by=b]$c`?
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R : Is there a simple way to achieve something similar to `x[,c:=mean(a), by=b]$c`?
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to way similar R achieve Is : there a simple to something by=b]$c`? `x[,c:=mean(a),