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...ad I do b=data.frame( z=1:10, a=a) then rbind(b,b) works well. In this case the data.frame was converted to its columns. Maybe b$a = a should do the same? Michael -- View this message in context: http://r.789695.n4.nabble.com/rbind-on-data-frame-that-contains-a-column-that-is-also-a-data-frame-tp2315682p2315682.html Sent from the R devel mailing list archive at Nabble.com.