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...need to do this on very large datasets (millions of rows). Does anyone know of an R package that has a function that can do this transformation? Any help is much appreciated! Thanks! -- View this message in context: http://r.789695.n4.nabble.com/help-with-simple-but-massive-data-transformation-tp2989850p2989850.html Sent from the R help mailing list archive at Nabble.com.