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colsums(x) rowsums(x)
colsums, colmeans, colVars
x <- matrix(rpois(1000 * 1000,10),ncol = 1000) x1 <- colsums(x) x2 <- colSums(x) all.equal(x1,x2) x1 <- rowsums(x) x2 <- rowSums(x) all.equal(x1,x2)
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