def tally_vote(vote=nil)
- vote.each_with_index do |winner, index|
+ vote.each_with_index do |winners, index|
if vote.flatten.length < @candidates.length
- implied_losers = @candidates.select { |c| not vote.include?(c) }
+ implied_losers = @candidates.select { |c| not vote.flatten.include?(c) }
vote.push(implied_losers)
end
if vote.length - 1 == index
place = [place] unless place.class == Array
place.each do |loser|
+ winners = [winners] unless winners.class == Array
+ next if winners.include?(loser)
+ winners.each do |winner|
+ @votes[winner] = Hash.new unless @votes.has_key?(winner)
+ @votes[loser] = Hash.new unless @votes.has_key?(loser)
+
+ if @votes[winner].has_key?(loser)
+ @votes[winner][loser] += 1
+ else
+ @votes[winner][loser] = 1
+ end
- @votes[winner] = Hash.new unless @votes.has_key?(winner)
- @votes[loser] = Hash.new unless @votes.has_key?(loser)
-
- if @votes[winner].has_key?(loser)
- @votes[winner][loser] += 1
- else
- @votes[winner][loser] = 1
+ # make sure we have a comparable object
+ @votes[loser][winner] = 0 unless @votes[loser].has_key?( winner )
end
-
- # make sure we have a comparable object
- @votes[loser][winner] = 0 unless @votes[loser].has_key?( winner )
end
end
end
end
class PureCondorcetVote < CondorcetVote
- def result
- PureCondorcetResult.new(self)
+ def resultFactory(init)
+ PureCondorcetResult.new(init)
end
end
end
protected
+
def defeats(candidates=nil, votes=nil)
candidates = @election.candidates unless candidates
votes = @election.votes unless votes
end
protected
+
def condorcet
votes = @election.votes
candidates = @election.candidates
-
+ unless votes.length>0 and candidates.length>0
+ @winners=[nil]
+ return @winners
+ end
victors = Hash.new
candidates.each do |candidate|
victors[candidate] = Array.new
victors[winner] << loser
end
- winners = @election.candidates.find_all do |candidate|
- victors[candidate].length == @election.candidates.length - 1
+ victory_margin = 1
+ while true
+ winners = @election.candidates.find_all do |candidate|
+ victors[candidate].length == @election.candidates.length - victory_margin
+ end
+ if winners.length > 0
+ @winners = winners
+ return @winners
+ else
+ victory_margin += 1
+ end
end
-
- @winners << winners if winners.length == 1
end
end
end
protected
+
def cpssd
votes = @election.votes
candidates = *@election.candidates
# see the array with the standard defeats
transitive_defeats = self.defeats(candidates, votes)
+ defeats_hash = Hash.new
+ transitive_defeats.each { |td| defeats_hash[td] = 1 }
candidates = [candidates] unless candidates.class == Array
candidates.each do |cand1|
candidates.each do |cand3|
if not cand2 == cand3 and
not cand1 == cand3 and
- transitive_defeats.include?( [ cand2, cand1 ] ) and
- transitive_defeats.include?( [ cand1, cand3 ] ) and
- not transitive_defeats.include?( [ cand2, cand3 ] )
- transitive_defeats << [ cand2, cand3 ]
+ defeats_hash[[cand2, cand1]] and
+ defeats_hash[[cand1, cand3]] and
+ not defeats_hash[[cand2, cand3]]
+ transitive_defeats << [cand2, cand3]
+ defeats_hash[[cand2, cand3]] = 1
end
end
end