I have this kind of matrix, with thousands of cases. A 2 apple A 2 peach A 3 peach B 1 pear B 4 peach B 4 beef B 7 beef C 1 peach D 2 apple D 5 peach
I have to distinguish, from the other rows, the rows with "peach" and this is not a problem. I also have to discriminate the rows with peach like the second one (associated with the same two cells "A" and "2" to "apple", see first row) from the row like the 3rd or the 8th ones, when the first two cells are "unique" ("A" and "3" or "C" and "1"). -- View this message in context: http://r.789695.n4.nabble.com/Does-it-exist-a-function-for-this-tp3873827p3873827.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.