me@r0bert.dev Robert Greener Fast aggregation of large data (e.g. 100GB in RAM), fast ordered joins, fast add/modify/delete of columns by group using no copies at all, list columns, friendly and fast character-separated-value read/write. Offers a natural and flexible syntax, for faster development. Matt Dowle mattjdowle@gmail.com https://github.com/Rdatatable/data.table/issues Rdatatable/data.table