Hi, With this code you can find row and col names for the largest value applied to your example:
r.m.tmp<-apply(dat,1,max) r.max<-names(r.m.tmp)[r.m.tmp==max(r.m.tmp)] c.m.tmp<-apply(dat,2,max) c.max<-names(c.m.tmp)[c.m.tmp==max(c.m.tmp)] It's inmediate how to get the same for the smallest and build a function to calculate everything and return a list. Regards, Carlos Ortega www.qualityexcellence.es 2011/10/11 Ben qant <ccqu...@gmail.com> > Hello, > > I'm looking to get the values, row names and column names of the largest > and > smallest values in a matrix. > > Example (except is does not include the names): > > > x <- swiss$Education[1:25] > > dat = matrix(x,5,5) > > colnames(dat) = c('a','b','c','d','c') > > rownames(dat) = c('z','y','x','w','v') > > dat > a b c d c > z 12 7 6 2 10 > y 9 7 12 8 3 > x 5 8 7 28 12 > w 7 7 12 20 6 > v 15 13 5 9 1 > > > #top 10 > > sort(dat,partial=n-9:n)[(n-9):n] > [1] 9 10 12 12 12 12 13 15 20 28 > > # bottom 10 > > sort(dat,partial=1:10)[1:10] > [1] 1 2 3 5 5 6 6 7 7 7 > > ...except I need the rownames and colnames to go along for the ride with > the > values...because of this, I am guessing the return value will need to be a > list since all of the values have different row and col names (which is > fine). > > Regards, > > Ben > > [[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. > [[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.