Module: MoreCoreExtensions::ArrayMath

Defined in:
lib/more_core_extensions/core_ext/array/math.rb

Instance Method Summary collapse

Instance Method Details

#mean ⇒ Object

Returns the mean of an Array of Numerics.

[1, 2, 3, 4, 5].mean  #=> 3.0
[1.0, 2.0, 3.0].mean  #=> 2.0



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# File 'lib/more_core_extensions/core_ext/array/math.rb', line 10

def mean
  sum.to_f / length
end

#stddev ⇒ Object

Returns the standard deviation of an Array of Numerics.

[1, 2, 3, 4, 5].stddev  #=> 1.5811388300841898
[1.0, 2.0, 3.0].stddev  #=> 1.0



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# File 'lib/more_core_extensions/core_ext/array/math.rb', line 19

def stddev
  Math.sqrt(variance)
end

#variance ⇒ Object

Returns the variance of an Array of Numerics.

[1, 2, 3, 4, 5].variance  #=> 2.5
[1.0, 2.0, 3.0].variance  #=> 1.0



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# File 'lib/more_core_extensions/core_ext/array/math.rb', line 28

def variance