I'm working with genotype data in a frequency table: > a=matrix(1:16, nrow=4) > rownames(a)=c("AA","AT","TA","TT") > a [,1] [,2] [,3] [,4] AA 1 5 9 13 AT 2 6 10 14 TA 3 7 11 15 TT 4 8 12 16
'AT' and 'TA' are essentially the same, and I'd like to combine (add) the rows to reflect this. The final matrix should be: [,1] [,2] [,3] [,4] AA 1 5 9 13 AT 5 13 21 29 TT 4 8 12 16 Is there a fast way to do this? Thanks in advance! Jacy Crosby jacy.r.cro...@uth.tmc.edu [[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.