Easy enough. What if some of the matrix elements contained missing values? Then how could you still calculate the means? Example code below: mat1 <- matrix(c(1,2,3,4,5,NA,7,8,9),3,3) mat2 <- matrix(c(NA,6,1,9,0,5,8,2,7),3,3) mat3 <- matrix(c(5,9,1,8,NA,3,7,2,4),3,3)
Gabor Grothendieck wrote: > > Try this: > > (mat1 + mat2 + mat3) / 3 > > On Mon, May 18, 2009 at 8:40 PM, dxc13 <[email protected]> wrote: >> >> useR's, >> I have several matrices of size 4x4 that I want to calculate means of >> their >> respective positions with. For example, consider I have 3 matrices given >> by >> the code: >> mat1 <- matrix(sample(1:20,16,replace=T),4,4) >> mat2 <- matrix(sample(-5:15,16,replace=T),4,4) >> mat3 <- matrix(sample(5:25,16,replace=T),4,4) >> >> The result I want is one matrix of size 4x4 in which position [1,1] is >> the >> mean of position [1,1] of the given three matrices. The same goes for >> all >> other positions of the matrix. If these three matrices are given in >> separate text files, how can I write code that will get this result I >> need? >> >> Thanks in advance, >> dxc13 >> -- >> View this message in context: >> http://www.nabble.com/how-to-calculate-means-of-matrix-elements-tp23607694p23607694.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> [email protected] 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. >> > > ______________________________________________ > [email protected] 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. > > -- View this message in context: http://www.nabble.com/how-to-calculate-means-of-matrix-elements-tp23607694p23615755.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ [email protected] 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.
