On Nov 15, 2007 12:50 PM, <[EMAIL PROTECTED]> wrote: > Hi, > > I've got an array, say with i,jth entry = A_ij, and a vector, say with jth > entry= v_j. I would like to multiply each column of the array by the > corresponding vector component, i,e. find the array with i,jth entry > > A_ij * v_j > > This seems so basic but I can't figure out how to do it without a loop. > Any suggestions? >
Here are 4 ways: A <- matrix(1:6, 3) v <- 10:11 A %*% diag(v) A * rep(1, nrow(A)) %o% v t(t(A) * v) A * replace(A, TRUE, v[col(A)]) ______________________________________________ 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.
