Merging Schools of Fish

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Imagine two schools of fish passing through each other, looking to the naked eye like a single group. A method in cluster analysis called fuzzy c-means (not used here) can split the fish into two schools according to how they move.
Contributed by: Michael Trott and Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Merging Schools of Fish"
http://demonstrations.wolfram.com/MergingSchoolsOfFish/
Wolfram Demonstrations Project
Published: March 7 2011