facets
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Fix Math.gini_coefficient(array)
Currently if you try this code:
require 'facets/math/gini_coefficient'
a = (1..10).to_a
Math::gini_coefficient(a)
It will throw this error:
lib/standard/facets/math/gini_coefficient.rb:16:in `gini_coefficient': undefined local variable or method `size' for Math:Module (NameError)
At first I thought I might be using it wrong, but all the other array-based methods in facets/math
seem to refer to the array directly, so this should too.