apply(a, 1, which.max) Apply the which.max() function to the matrix a row-wise (1)
Michael On Tue, Jul 17, 2012 at 5:03 PM, Christopher Desjardins <cddesjard...@gmail.com> wrote: > Hi, > Let's say I have the following data: > >> a=matrix(c(1,2,4,4,2,1,1,2,4),nrow=3,byrow=T) > >> a > > [,1] [,2] [,3] > > [1,] 1 2 4 > > [2,] 4 2 1 > > [3,] 1 2 4 > > What syntax should I use to get R to tell me the column that corresponds to > the maximum value for each row? > > For my example, I would like to get a vector that says 3, 1, 3 because the > maximum value for row 1 is in column 3, the maximum value for row 2 is in > column 1, and the maximum value for row 3 is in column 3. > > Does that make sense? > > Please cc me if you reply! > > Chris > > [[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. ______________________________________________ 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.
