Hello everyone, please consider the following lines of a matrix
[574,] 59 32 [575,] 59 32 [576,] 59 32 [577,] 59 32 [578,] 59 32 [579,] 59 32 [580,] 59 32 [581,] 60 32 [582,] 60 33 [583,] 60 33 [584,] 60 33 [585,] 60 33 [586,] 60 33 [587,] 60 33 [588,] 60 33 [589,] 60 33 [590,] 60 33 [591,] 61 33 [592,] 61 33 [593,] 61 33 [594,] 61 33 [595,] 61 33 [596,] 61 33 [597,] 61 33 [598,] 61 33 [599,] 61 33 [600,] 61 33 [601,] 62 34 Is it possible somehow to count the similarities between the first and second column and put them on a third column like this? 59 32 3 60 33 5 62 34 1 where (3,5,1 are the frequencies for (59,32), (60,33) and (62,34) Best Regards Alex [[alternative HTML version deleted]] ______________________________________________ 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.