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Stored size: 964 Bytes
Contents
module Exonio
module Statistical
# Sum of all numbers
#
# @param numbers_ary [array] and array of numbers to sum all elements
#
# @return [float]
#
# @example
# Exonio.sum([1,2,3,4,5]) # => 15
def sum(numbers_ary)
numbers_ary.inject(0, :+)
end
# Simple mean formula: sum elements and / by length
#
# @param numbers_ary [array] an array of numbers to calculate the mean
#
# @return [float]
#
# @example
# Exonio.mean([1,2,3,4,5]) # => 3.0
def mean(numbers_ary)
numbers_ary.inject(0) { |sum, i| sum + i }.to_f / numbers_ary.size
end
# Median formula
# @param numbers_ary [array] an array of numbers
#
# @return [float]
#
# @example
# Exonio.median([1,2,3,4,5]) # => 3.0
def median(numbers_ary)
numbers_ary.sort!
len = numbers_ary.length
(numbers_ary[(len - 1) / 2] + numbers_ary[len / 2]) / 2.0
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems