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Clustering Main article: Cluster analysis Cluster analysis or clustering is the assignment of a set of observations into subsets (called clusters) so that observations in the same cluster are similar in some sense. Clustering is a method of unsupervised learning, and a common technique for statistical data analysis.
http://en.wikipedia.org/wiki/Matrix_(mathematics)
http://en.wikipedia.org/wiki/Fitness_landscape
http://en.wikipedia.org/wiki/Cluster_analysis