Hi, Check this link http://tolstoy.newcastle.edu.au/R/help/05/04/1765.html
set.seed(15) list1<-lapply(1:3,function(i) matrix(sample(1:10,6,replace=TRUE),ncol=i) ) lapply(list1,function(x) colMeans(x,na.rm=TRUE)) [[1]] #[1] 6.666667 #[[2]] #[1] 6.333333 6.000000 ## #[[3]] #[1] 7.0 9.0 7.5 A.K. ----- Original Message ----- From: eliza botto <eliza_bo...@hotmail.com> To: "r-help@r-project.org" <r-help@r-project.org> Cc: Sent: Wednesday, January 2, 2013 5:16 PM Subject: [R] list of matrices dear useRs, i have a list containing 16 matrices. i want to calculate the column mean of each of them. i tried >sr <- lapply(s,function(x) colMeans(x, na.rm=TRUE)) but i am getting the following error >Error in colMeans(x, na.rm = TRUE) : 'x' must be numeric can it be done in any other way? and why i am getting this error?? thanks in advance.. elisa [[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.
