chromosome.rb

GENE_SIZE = 64
MUTATION_RATE = 0.001
#MUTATION_RATE = 0.01

class Chromosome

	attr_accessor :genes

	def initialize genes = nil
		genes ? self.genes = genes : self.genes = (1..GENE_SIZE).map{ rand(3) }.join
	end

	def fitness
		genes.count('2') + genes.count('1')/2
	end

	def mutate!
		mutated = []
		genes.split('').each do |gene|
			if rand < MUTATION_RATE
				gene += 1
				gene %= 3
			end
		end
		mutated << gene
		self.genes = mutated.join
	end
			
	def & other
		split = rand(genes.length + 1)
		child = genes[0, split] + other.genes[split, other.genes.length]
	end

	def to_s
		genes
	end
end
c1 = Chromosome.new
c2 = Chromosome.new
puts 'Chromosome 1'
puts c1
puts 'Fitness'
puts c1.fitness
puts '----'
puts 'Chromosome 2'
puts c2
puts 'Fitness'
puts c2.fitness
puts '----'
child = Chromosome.new c1 & c2
puts 'Child'
puts child
puts 'Fitness'
puts child.fitness