I wrote a post on S.O http://stackoverflow.com/questions/17216843/rolling-joins-in-data-table-with-multiple-matches/17219629?noredirect=1#comment24955451_17219629
It seems that when "roll" is specified in Y[X, roll=rollValue] even if there are several lines of Y that matches one row of X, just one is selected. I was looking for window joins like in kdb: http://code.kx.com/wiki/Reference/wj et I was thinking that because all the roll logic is already there, may be it would be a good feature to get all rows matched when roll is specified. What do you think ? -- View this message in context: http://r.789695.n4.nabble.com/About-roll-in-data-table-tp4670023.html Sent from the datatable-help mailing list archive at Nabble.com. _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
