Hi, The result is : "F" "F" "ERROR" "ERROR" "F" "ERROR" but it should be : "F" "F" "M" "M" "F" "E" !! -- View this message in context: http://r.789695.n4.nabble.com/R-Comparison-tp4714329p4714351.html Sent from the datatable-help mailing list archive at Nabble.com.