Matthew Dowle wrote
> othercols = setdiff(names(DT5),c("x","y"))
> DT5[y<=3 & Reduce(`&`,lapply(DT5[,othercols,with=FALSE],`<=`,7)),
> max(y), by=x]
> x V1
> 1: a 3
> 2: b 1
Many thanks, Matthew!
That's exactly what I was looking for.
Congratulations for the great package and thank you for the advice!
Berto
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