| http://www.w3.org/ns/prov#value | - Where they overlap is in the fast grouping which plyr also does by splitting data.frames, operating on pieces, and recombining them into a single data.frame. data.table has many other features which make operations on data.frame like structures fast; plyr has features which apply the split-apply-combine paradigm to other data structures such as lists and arrays (both as inputs and outputs).
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