colMeans(X,na.rm=T) ?colMeans
2007/11/27, Luke Neraas <[EMAIL PROTECTED]>: > # Hello, > > # I have a matrix that contains some missing values denoted by NA. > # I would like to calculate the mean for each column and not have the > # NA values included. here is a sample matrix "X" below. > > > c1 <- c(1,4,3,2,NA,2,5,6,4,2) > c2 <- c(1,3,6,NA,NA,2,9,6,1,2) > c3 <- c(2,4,2,NA,4,2,NA,6,3,5) > c4 <- c(2,6,4,NA,4,2,NA,6,1,5) > c5 <- c(2,3,2,NA,4,2,9,6,NA,5) > > X<-cbind(c1,c2,c3,c4,c5) > > X > > # I have tried a variety of methods to calculate the Column means but each > time > # i do not get the result i am looking for > > result<-colMeans(X) # only returns a mean of NA > > > X <- X[!is.na(X)] # Effectively removes the NA values but now I > cannot calculate Column Means > > # Below is the result of the column means I am looking for > > result > c1 c2 c3 c4 c5 > [1,] 3.22 3.75 3.5 3.75 4.125 > > > # any help or ideas would be greatly appreciated > > # thanks in advance > > Luke Neraas > > [EMAIL PROTECTED] > > University of Alaska Fairbanks > School of Fisheries and Ocean Sciences > 11120 Glacier Highway > UAF Fisheries Division > Juneau, AK 99801 > > ______________________________________________ > 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.
