Class: ERV::GaussianDistribution

Inherits:
Distribution show all
Defined in:
lib/erv/gaussian_distribution.rb

Instance Method Summary collapse

Methods inherited from Distribution

#sample

Constructor Details

#initialize(opts) ⇒ GaussianDistribution

Returns a new instance of GaussianDistribution.

Raises:

  • (ArgumentError) 


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# File 'lib/erv/gaussian_distribution.rb', line 12

def initialize(opts)
  super(opts)

  raise ArgumentError unless opts[:mean] and opts[:sd]
  mean = opts[:mean].to_f
  sd   = opts[:sd].to_f

  if RUBY_PLATFORM == 'java'
    # create distribution
    d = NormalDistribution.new(@rng, mean, sd,
            NormalDistribution::DEFAULT_INVERSE_ABSOLUTE_ACCURACY)
    # setup sampling function
    @func = Proc.new { d.sample }
  else
    # setup sampling function
    @func = Proc.new { mean + @rng.ran_gaussian(sd) }
  end
end