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A bunch of distance measures

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``` requre irb(main):001:0> require 'distance_measures' => true irb(main):002:0> a = [1,1] => [1, 1] irb(main):003:0> b = [2,2] => [2, 2] irb(main):004:0> irb(main):005:0* a.euclidean_distance(b) (irb):5: [BUG] Segmentation fault ruby 2.0.0p247...

I was just wondering, is it possible to add support for Hash in similiarity methods? I've cauht myself re-implementing it without knowing of the existence of this gem. For example...

$ ruby -v ruby 1.9.2dev (2010-05-31 revision 28117) [x86_64-darwin10.3.1] $ gem -v 1.3.7 $ irb ruby-1.9.2-preview3 > require 'distance_measures' LoadError: dlopen(/Users/blatyo/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/distance_measures-0.0.4/lib/distance_measures/euclidean_distance.bundle, 9): Library not loaded: /Users/reddavis/.rvm/rubies/ruby-1.9.2-rc1/lib/libruby.1.9.1.dylib Referenced from: /Users/blatyo/.rvm/gems/ruby-1.9.2-preview3@rails3/gems/distance_measures-0.0.4/lib/distance_measures/euclidean_distance.bundle Reason:...