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Contents
#--
# Author:: Tyler Rick
# Copyright:: Copyright (c) 2007 QualitySmith, Inc.
# License:: Ruby License
# Submit to Facets?:: Yes.
# Wait, so Facets has mode (http://facets.rubyforge.org/src/doc/rdoc/classes/Enumerable.html#M001253) but it doesn't have mean/average?
# Whether or not this Array#average is included, Facets ought to have an Enumerable#mean/average similar to mode that uses each iterator rather than Array#size. (Still might want to keep this version if it's more efficient for Arrays?)
#++
class Array
# Calculates the arithmetic average (mean) of the elements in the array as a <tt>Float</tt>.
# irb -> [1, 3, 3].average
# => 2.33333333333333
def average
if self.size == 0
raise ZeroDivisionError
end
self.inject(0.0) do |sum, item|
sum + item.to_f
end / self.size
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TheTest < Test::Unit::TestCase
def test_average
assert_equal 2, [0, 4].average
assert_equal Float, [0, 4].average.class
assert_equal 2.5, [0, 5].average
assert_raise ZeroDivisionError do
[].average
end
end
end
=end
Version data entries
11 entries across 11 versions & 1 rubygems