Hi All, I need to a calculation W%*%d. However I know that this matrix is symmetric (since W=t(d)%*%w). My question is considering that I only need to calculate the lower/ upper triangle (n(n+1)/2 elements) rather than the n^2 elements of the entire matrix. Is there a way to do this efficiently.
My 'n' can be quite large (upto 10,000 or more?). Thanks, Sachin [[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.