Top Level Namespace

Defined Under Namespace

Modules: GeneratorInstructions, MigrationGenerator, ModelUpdater Classes: Sigma, SigmaGenerator

Instance Method Summary collapse

Instance Method Details

#define_match_data(difficult) ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 54

def define_match_data(difficult)
  @expectation          = (difficult == 0) ? 0 : difficult > 0
  @resource_probability = probability(@expectation)

  if difficult == 0 || difficult < 2.5*Sigma::SCALE/100 && difficult > 0
    @difficult = 2.5*Sigma::SCALE/100
  elsif difficult > -2.5*Sigma::SCALE/100 && difficult < 0
    @difficult = -2.5*Sigma::SCALE/100
  else
    @difficult = difficult.abs
  end
  @alpha = (@difficult / Sigma::SCALE).abs
end

#lost(match_difficult) ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 40

def lost(match_difficult)
  define_match_data(match_difficult)

  if !@expectation
    skill_lost = self.skill/@alpha/Sigma::SCALE/(Sigma::SCALE+@difficult.abs/@alpha)
  else
    skill_lost = self.skill * @alpha
  end
  self.skill = self.skill - skill_lost
  update_sigma(false)
  self.increment :losses
  self.save
end

#matches ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 21

def matches
  self.wins + self.losses + self.draws
end

#position ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 17

def position
  self.class.ranking.index(self) + 1
end

#probability(expectation) ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 85

def probability(expectation)
  result       = (expectation == true) ? 'wins' : nil
  result       ||= (expectation == false) ? 'losses' : 'draws'

  exp_result   = (expectation == true) ? :we : nil
  exp_result   ||= (expectation == false) ? :le : :de

  w = self.wins   * 100.0 / ((matches == 0) ? 1 : matches)
  l = self.losses * 100.0 / ((matches == 0) ? 1 : matches)
  d = self.draws  * 100.0 / ((matches == 0) ? 1 : matches)

  expectations = {
                    'wins'   =>  { we:0, le:0, de:0 },
                    'losses' =>  { we:0, le:0, de:0 },
                    'draws'  =>  { we:0, le:0, de:0 }
                 }

  expectations.each do |k, v|
    mult = (k == 'wins') ? w : nil
    mult ||= (k == 'losses') ? l : d

    v[:we] = mult*(self.expectations['win_expectation'][k]*100.0/((self[k] == 0) ? 1 : self[k]))
    v[:le] = mult*(self.expectations['lost_expectation'][k]*100.0/((self[k] == 0) ? 1 : self[k]))
    v[:de] = mult*(self.expectations['draw_expectation'][k]*100.0/((self[k] == 0) ? 1 : self[k]))
  end

  all_probabilities = expectations[result][:we]+expectations[result][:le]+expectations[result][:de]
  probability       = expectations[result][exp_result] / ((all_probabilities == 0) ? 1 : all_probabilities)
  (probability == 0) ? 0.25 : probability
end

#rating ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 13

def rating
  self.skill - 3 * self.doubt
end

#update_sigma(exp) ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 68

def update_sigma(exp)
  exp_result    = (@expectation == true) ? 'win_expectation' : nil
  exp_result    ||= (@expectation == false) ? 'lost_expectation' : 'draw_expectation'
  result        = (exp == true) ? 'wins' : nil
  result        ||= (exp == false) ? 'losses' : 'draws'
  expectations  = self.expectations[exp_result][result]

  self.expectations[exp_result][result] = expectations + 1
  if @expectation == exp
    salpha     = (1 - @resource_probability) * @alpha
    self.doubt = self.doubt - self.doubt * salpha
  else
    salpha     = @resource_probability * @alpha
    self.doubt = self.doubt + self.doubt * salpha
  end
end

#won(match_difficult) ⇒ Object 



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# File 'lib/generators/templates/resource_model.rb', line 25

def won(match_difficult)
  define_match_data(match_difficult)

  if @expectation == true
    skill_won = self.skill/@alpha/Sigma::SCALE/(Sigma::SCALE+@difficult/@alpha)
  else
    skill_won = self.skill * @alpha
  end

  self.skill = self.skill + skill_won
  update_sigma(true)
  self.increment :wins
  self.save
end