Does this help? A <- matrix(0, 6, 6) vec <- 1:5 A[row(A) == col(A) + 1] <- vec
--sundar On Wed, Mar 11, 2009 at 4:42 PM, Stu Field <s...@colostate.edu> wrote: > I'm trying to enter a vector into the subdiagonal of a matrix but > cannot find a command in R which corresponds to the MatLab version of > diag(vec, k), where vec = the vector of interest, and k = the diagonal > (k=0 for the diagonal; k=-1 for the subdiagonal; k=1 for > superdiagonal, etc.) > Is there an equivalent command in R? > > I'm looking for something like this: > vec = seq(1, 5, 1) # vector of interest > > A = xyz(vec,-1) # creates a 6x6 matrix with vec on the > subdiagonal > where xyz is some function similar to diag, but with differing > arguments. > > I can't believe there is not a simple way to do this... > Thanks for your help, > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Stu Field, PhD > Postdoctoral Fellow > Department of Biology > Colorado State University > 1878 Campus Delivery > Fort Collins, CO 80523-1878 > Office: E208 Anatomy/Zoology > Phone: (970) 491-5744 > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > > > [[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.
