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R exercise
Hierarchical Clustering 1
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set.seed(2)
x <- matrix(rnorm(50 * 2), ncol = 2)
x[1:25, 1] <- x[1:25, 1] + 3
x[1:25, 2] <- x[1:25, 2] - 4
hc.average <- ...
hc.single <- ...