Class: NormalRandom

Inherits:

Object

• Object
• NormalRandom

Defined in:

lib/normal_random.rb,
lib/normal_random/version.rb

Constant Summary

DEFAULT_MU =

100

DEFAULT_SIGMA =

15

VERSION =

'1.0.0'

Instance Attribute Summary

• #rng ⇒ Object

  Returns the value of attribute rng.

Instance Method Summary

• #box_muller ⇒ Object (also: #standard_deviations)
• #initialize ⇒ NormalRandom constructor

  A new instance of NormalRandom.

• #rand(mu: DEFAULT_MU, sigma: DEFAULT_SIGMA) ⇒ Object

Constructor Details

#initialize ⇒ NormalRandom

Returns a new instance of NormalRandom.

# File 'lib/normal_random.rb', line 10

def initialize
  self.rng = Random.new
end

Instance Attribute Details

#rng ⇒ Object

Returns the value of attribute rng.

# File 'lib/normal_random.rb', line 8

def rng
  @rng
end

Instance Method Details

#box_muller ⇒ Object Also known as: standard_deviations

# File 'lib/normal_random.rb', line 18

def box_muller
  Math.sqrt(-2*Math.log(rng.rand))*Math.cos(2*Math::PI*rng.rand)
end

#rand(mu: DEFAULT_MU, sigma: DEFAULT_SIGMA) ⇒ Object

# File 'lib/normal_random.rb', line 14

def rand(mu: DEFAULT_MU, sigma: DEFAULT_SIGMA)
  (standard_deviations * sigma) + mu
end