At 2:40 PM +0900 9/17/09, Gundala Viswanath wrote:
I have a data frame (dat). What I want to do is for each row, divide each row with the sum of its row.The number of row can be large > 1million. Is there a faster way than doing it this way? datnorm; for (rw in 1:length(dat)) { tmp <- dat[rw,]/sum(dat[rw,]) datnorm <- rbind(datnorm, tmp); } - G.V.
datnorm <- dat/rowSums(dat) this will be faster if dat is a matrix rather than a data.frame. Bill
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