pdb wrote: > > Hi, > > Hopefully someone can point me in the right direction on how I would go > about solving the following. > > I have some data and need to find the column name of the maximum value in > each row. > > This could be the data... > >> a <- data.frame(x = rnorm(4), y = rnorm(4), z = rnorm(4)) >> a > x y z > 1 1.6534561 0.11523404 0.2261730 > 2 -1.2274320 -0.24096054 1.5096028 > 3 -1.4503096 0.07227427 1.6740867 > 4 0.1867416 1.25318913 -0.7350560 > > Here is what I need to generate... > > 1 x > 2 z > 3 z > 4 y > > Any pointers would be appreciated. > > Regards, > > > >
as.data.frame(cbind(row.names(a),apply(a,1,function(x) names(a)[which(x==max(x))]))) LB -- View this message in context: http://r.789695.n4.nabble.com/finding-max-value-in-a-row-and-reporting-colum-name-tp2309358p2310192.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.