<分区>
我是 Ruby 的初学者，编写了一个非常简单的程序来模拟遗传学，但输出适应度始终大致保持在 15-24 左右。这个程序不应该最终达到 32 的适应度然后输出吗？
编辑后的代码:
#!/usr/bin/env ruby
class Animal
attr_reader :genes
def initialize (genes=[])
@genes = genes
end
def random_chromosome
@genes = Array.new(32).collect {|x| rand 2}
self
end
def calc_fitness
@genes.inject(0){|i, v| next i + v if v == 1; i}
end
def mutate
2.times { @genes[rand 32] = rand 2}
end
def mate(other)
@genes = (@genes[0...16] + other.genes[0...16])
mutate
self
end
def is_spartan?
@genes == (Array.new.fill 1)
end
end
class Generation
attr_reader :animals
def initialize (animals=[], gen_size = 10)
@animals = animals
@gen_size = gen_size
end
def seed
@animals = Array.new(@gen_size).collect {Animal.new.random_chromosome}
end
def mate
@animals = [].tap {|a|
@gen_size.times{
a << @animals[rand @gen_size].mate(@animals[rand @gen_size])
}
}
end
def alphas
@animals.sort! {|a, b| b.calc_fitness <=> a.calc_fitness}.first(@gen_size)
end
def include_spartans?
@animals.include? Array.new(32).fill 1 #perfect genes
end
def output
@animals.each {|an| print "#{an.genes.join}: #{an.calc_fitness}\n"}
end
end
NUM_OFFSPRING = 10
gen = Generation.new
gen.seed
i = 0
loop do
i += 1
if gen.include_spartans? #end if there are any perfect genes
puts "Members have reached spartan status!"
break
end
puts "*** ALPHAS FROM GENERATION: #{i}***"
gen.mate
gen.alphas
gen.output
sleep(0.2)
end
示例输出
* 一代阿尔法:1*
11101101011111101001010110101101: 21 10111111111100000110000101011001: 18 11101111110110111100001100000001: 18 11000101101111010110000111011001: 18 11101111110110111100001100000001: 18 10111111111100000110000101011001: 18 11000101101111010110000111011001: 18 11000011010000011001101111101101: 17 01100001110110011000101111110000: 16 10001010111110001100001101000001: 14
* 一代阿尔法:2*
11101111110110101110111111010011: 24 01100001110110011110111111011110: 21 11000101101111011100001101000001: 16 10001010111110000110000111011001: 16 11000101101111011100001101000001: 16 10111111010100001000001101100001: 15 10111111010100001000001101100001: 15 10111111010100001000001101100001: 15 10111111010100001000001101100001: 15 10111111010100001000001101100001: 15
* 一代阿尔法:3*
11101111111110101011111111000000: 22 11101111111110101011111111000000: 22 10111111110000001110011111011010: 20 10111111110000001110011111011010: 20 10111111110000001110011111011010: 20 11000101101111011000101011111000: 18 11000101101111011000101011111000: 18 11000101101111011000101011111000: 18 11000101101111011000101011111000: 18 01100001110100011011111101010000: 16