If possible I'd like to produce a function that applies a formula to a column in a matrix (essentially calculating the mse) and then inserts it between values of a an array ...
confusing I know, here is an example of what I'm trying to accomplish: ## create a matrix (a <- matrix(c(3,6,4,8,5,9,12,15),nrow=4)) ## get the mean of all columns (b <- apply(a,2,mean)) ## calculate the mse of column 1 (c <- (sd(a[,1])/sqrt(length(a[,1])))) ## calculate the mse of column 2 (d <- (sd(a[,2])/sqrt(length(a[,2])))) ## now create a new vector with each mean value and its corresponding ## mse right beside it (e <- c(b[1],c,b[2],d)) Would anyone have any suggestions how to accomplish this using an apply statement? Thanks a bunch, J =============================== Dr. Jim Maas University of East Anglia ______________________________________________ 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.
