Hierarchical Clustering by hclust in R on a distance matrix between four cities
Channel: Hong Qin
Date: 2012-03-14

R code and data at: https://github.com/hongqin/RCompBio/tree/master/hclust.4cities

Another version using Lady Gaga's is at: https://www.youtube.com/watch?v=u5tlUVbnrCg