Yes, but colMeans, rowMeans, pmax, pmin , etc. are *much* faster. Cheers, Bert
Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Fri, Feb 12, 2016 at 9:15 PM, Jim Lemon <drjimle...@gmail.com> wrote: > Hi Ashta, > Surely you are aware of the "apply" family of functions that return the > numbers you want: > > ashmat<-matrix(c(117,12,13,21,21,32,11,1,65,43,23,7,58,61,78,95 ), > nrow=4,byrow=TRUE) > apply(ashmat,2,mean) > [1] 65.25 37.00 31.25 31.00 > apply(ashmat,1,which.max) > [1] 1 2 1 4 > > Jim > > > On Sat, Feb 13, 2016 at 3:04 PM, Ashta <sewa...@gmail.com> wrote: > >> hi all, >> >> I have a square matrix (1000 by 1000), >> 1. I want calculate mean, min and max values for each column and row. >> >> 2, I want pick the coordinate value of the matrix that has the max >> and min value for each row and column. >> This an example 4 by 4 square matrix >> >> >> Mean Min Max >> 117 12 13 21 40.75 12 117 >> 21 32 11 1 16.25 1 32 >> 65 43 23 7 34.5 7 65 >> 58 61 78 95 73 58 95 >> Mean 65 25 37 31.25 >> Min 21 12 11 1 >> Max 117 61 78 95 >> >> >> Thank you >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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 -- To UNSUBSCRIBE and more, see > 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 -- To UNSUBSCRIBE and more, see 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.