I have a table like this: A B aaa 111 bbb 222 ccc 333 ddd 444 and I would like a new row C: A B C aaa 111 aaa.111 bbb 222 bbb.222 ccc 333 ccc.333 ddd 444 ddd.444 How can I do this ??? Thanks Alberto -- View this message in context: http://r.789695.n4.nabble.com/Concat-two-rows-tp3064998p3064998.html Sent from the R help mailing list archive at Nabble.com.