Hello, see this example :
require(data.table) table1<-data.table(id=c(1,2,3),x=c(1,2,3)) table2<-table1 table1[,y:=sum(x)] table1 table2 The problem ? Both of table1 and table2 have the variable 'y' BUT only table1 should. Thx -- View this message in context: http://r.789695.n4.nabble.com/data-table-BUG-data-table-assignment-tp4644988.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
