Class: Croupier::Distributions::Uniform

Inherits:
Croupier::Distribution show all
Defined in:
lib/croupier/distributions/uniform.rb

Overview

Uniform Distribution Continous distribution where all points in an interval have the same probability.

Instance Attribute Summary

Attributes inherited from Croupier::Distribution

#description, #name, #parameters

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Croupier::Distribution

#configure, #generate_sample

Constructor Details

#initialize(options = {}) ⇒ Uniform

Returns a new instance of Uniform.



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# File 'lib/croupier/distributions/uniform.rb', line 11

def initialize(options={})
  @name = "Uniform distribution"
  @description = "Continuous distribution on [a,b] (defaults to [0,1]) where all points in the interval are equally likely"
  configure(options)
end

Class Method Details

.cli_name ⇒ Object 



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# File 'lib/croupier/distributions/uniform.rb', line 26

def self.cli_name
  "uniform"
end

.cli_options ⇒ Object 



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# File 'lib/croupier/distributions/uniform.rb', line 30

def self.cli_options
  {:options => [
     [:a, 'interval start value', {:type=>:float, :default => 0.0}],
     [:b, 'interval end value', {:type=>:float, :default => 1.0}]
   ],
   :banner => "Uniform distribution. Generate numbers following a continuous distribution on [a,b] (defaults to [0,1]) where all points in the interval are equally likely"
  }
end

Instance Method Details

#default_parameters ⇒ Object 



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# File 'lib/croupier/distributions/uniform.rb', line 22

def default_parameters
  {:a => 0, :b => 1}
end

#generate_number ⇒ Object

Raises:



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# File 'lib/croupier/distributions/uniform.rb', line 17

def generate_number
  raise Croupier::InputParamsError, "Invalid interval values" if @parameters[:b] < @parameters[:a]
  rand Range.new(@parameters[:a], @parameters[:b])
end