What is an easy way to stack a matrix multiple times? E.g. I have a 6x6 matrix that I need to stack vertically 154 times to get a 6*154 by 6 matrix. I would rather not rbind(X,X,...,X) matrices. --Joe [[alternative HTML version deleted]]
how about y = X[rep(1:nrow(X), 6), ] ? On Mon, Mar 15, 2010 at 5:37 PM, <JLucke at ria.buffalo.edu> wrote:> What is an easy way to stack a matrix multiple times? ?E.g. ?I have a 6x6 > matrix that I need to stack vertically 154 times to get a 6*154 by 6 > matrix. ?I would rather not rbind(X,X,...,X) matrices. ? ?--Joe > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >
On 3/15/2010 1:37 PM, JLucke at ria.buffalo.edu wrote:> What is an easy way to stack a matrix multiple times? E.g. I have a 6x6 > matrix that I need to stack vertically 154 times to get a 6*154 by 6 > matrix. I would rather not rbind(X,X,...,X) matrices. --JoeX <- matrix(runif(36), ncol=6) matrix(rep(t(X), 154), ncol=6, byrow=TRUE)> [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.-- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894