for example I have matrix with two columns x,y 1,0.56 2,9.55 2,7.56 5,2.55 5,0.56 3,0.55 2,0.56 2,1.56
so I need to take average from y values placed where x==2 -- View this message in context: http://r.789695.n4.nabble.com/how-to-make-partial-mean-of-a-matrix-only-when-second-value-matching-some-logic-tp3078449p3078449.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.
