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Contents
module Statistics
module Distribution
class Uniform
attr_accessor :left, :right
def initialize(a, b)
self.left = a.to_f
self.right = b.to_f
end
def density_function(value)
if value >= left && value <= right
1/(right - left)
else
0
end
end
def cumulative_function(value)
if value < left
0
elsif value >= left && value <= right
(value - left)/(right - left)
else
1
end
end
def mean
(1/2.0) * ( left + right )
end
alias_method :median, :mean
def variance
(1/12.0) * ( right - left ) ** 2
end
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems