[datatable-help] New data.table questions for Oct 19 - Stack Exchange

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1 new question in [data.table filter](http://stackexchange.com/filters/7853/data-table) on stackexchange.com

[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)




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