Class: Distem::Events::RngStreamRandomGenerator

Inherits:

RandomGenerator

• Object
• RandomGenerator
• Distem::Events::RngStreamRandomGenerator

show all

Defined in:

lib/distem/events/rngstreamrandomgenerator.rb

Instance Method Summary (collapse)

• - (Object) advance_state(displacement)
• - (RngStreamRandomGenerator) initialize(seed = nil) constructor

  Class which use a RngStream to generate random numbers Better from a statistical point of view, because each stream is independant.

• - (Object) rand_U01

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# File 'lib/distem/events/rngstreamrandomgenerator.rb', line 10

def initialize(seed = nil)
  @stream = RandomExtension::RngStream.new
  if seed
    if seed.is_a?(Array)
      raise "Invalid seed array size, must be >= 6" if seed.length < 6
      @stream.set_seed(seed)
    elsif seed.is_a?(Numeric)
      seed_array = [ seed, seed, seed, seed, seed, seed]
      @stream.set_seed(seed_array)
    else
      raise "Invalid seed type"
    end
  end
end

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# File 'lib/distem/events/rngstreamrandomgenerator.rb', line 29

def advance_state(displacement)
  @stream.advance_state(displacement)
  return self
end

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# File 'lib/distem/events/rngstreamrandomgenerator.rb', line 25

def rand_U01
  return @stream.randU01
end