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Hi Can someone show me an easy way to multiple a weighted vector with an matrix? example below mat1<-matrix(sample(1:100,80,replace=TRUE),ncol=8) w <- 1/1:10 I want the first element in w to be multiplied by the first row of mat1 and 2nd element in w to be multiplied with the 2nd row and so on. I have huge matrix is there an easy way other than diag(w)%*%mat1 Thanks -- View this