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[Identifying duplicated rows in a data\.table \- Porting set operations from data frames](http://stackoverflow.com/questions/7822138/identifying-duplicated-rows-in-a-data-table-porting-set-operations-from-data-fr) I am porting some little helper functions to do set operations, and haven't found an easy way to find duplicated rows in a data table. It gives an error that data tables must have keys. Examples … Tagged: r data.frame data.table set-operations by [Iterator](http://stackoverflow.com/users/805808/iterator) on [stackoverflow.com](http://stackoverflow.com) **[Unsubscribe from this filter](http://stackexchange.com/email/unsubscribe-filter/54059/235150997?code=VBJvP7U1BOHFZPzYcxdcgX7ph6F1aRvUSr1D50ChurM%3d) or change your email preferences by visiting your [filter subscriptions page on stackexchange.com](http://stackexchange.com/users/982621?tab=subscriptions).** _________________________________________________________________________ Questions? Comments? Let us know on our [feedback site][9]. If you no longer want to receive mail from Stack Exchange, [unsubscribe from all stackexchange.com emails][7]. Stack Exchange, Inc. One Exchange Plaza, 26th Floor, NY NY 10006 <3 [7]: http://stackexchange.com/email/manage/87663/e8677ed809eb95d9521d37a09a6bb4e95cfb1bc107ebba647fc80f3a0056f9c9 [8]: http://stackexchange.com [9]: http://meta.stackoverflow.com
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