#I am trying to write code that will create a matrix with a variable number of columns where the #number of columns is 1+Grps #I can do this: NSims <- 4 Grps <- 5 DiffMeans <- matrix(nrow=NSims,ncol=1+Grps) DiffMeans
#I have a problem when I try to name the columns of the matrix. I want the first column to be NSims, #and the other columns to be something like Value1, Value2, . . . Valuen where N=Grps # I wrote a function to build a list of length Grps createValuelist <- function(num_elements) { for (i in 1:num_elements) { cat("Item", i, "\n", sep = "") } } createValuelist(Grps) # When I try to assign column names I receive an error: #Error in dimnames(DiffMeans) <- list(NULL, c("NSim", createValuelist(Grps))) : # length of 'dimnames' [2] not equal to array extent dimnames(DiffMeans) <- list(NULL,c("NSim",createValuelist(Grps))) DiffMeans # Thank you for your help! John David Sorkin M.D., Ph.D. Professor of Medicine, University of Maryland School of Medicine; Associate Director for Biostatistics and Informatics, Baltimore VA Medical Center Geriatrics Research, Education, and Clinical Center; PI Biostatistics and Informatics Core, University of Maryland School of Medicine Claude D. Pepper Older Americans Independence Center; Senior Statistician University of Maryland Center for Vascular Research; Division of Gerontology and Paliative Care, 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 Cell phone 443-418-5382 ______________________________________________ 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.