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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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