Add bin and edit workflow

bin/gems/facets-3.1.0/lib/standard/facets/math/distance.rb

@@ -0,0 +1,19 @@
+module Math
+
+  # Calculates the Euclidean Distance between points +p+ and +q+.
+  # 
+  # `p`, `q` is assumed to described coordinates in N-dimensions, e. g.:
+  #
+  #    Math.distance([1, 1], [2, 2])          # 2D coordinates
+  #    Math.distance([1, 1, 1], [2, 2, 2])    # 3D coordinates
+  #
+  # If N is 1, then `::distance` may also be invoked like so:
+  #
+  #    Math.distance(1, 1)  
+  #
+  def self.distance(p, q)
+    p, q = [p].flatten, [q].flatten
+    sqrt(p.zip(q).inject(0){ |sum, coord| sum + (coord.first - coord.last)**2 })
+  end
+
+end