NetLogo模型中雌龟交配条件失效问题求助及解决说明

Edit: I solved this issue. The problem was that I had set adult = true while creating females.

问题背景 #

我刚接触NetLogo，遇到个棘手的问题，网上搜了一圈没找到答案，来求助各位！

我做了一个包含雌雄群体的模型：雄性体型固定为10，雌性体型由正态分布随机生成。我的需求是只让体型≥10的雌性参与交配，但运行模型时发现所有雌性（哪怕体型小于10的）都在进行交配操作。麻烦帮忙看看我的代码哪里出错了？以下是相关代码片段（模型还在开发中，只贴关键部分）：

colonies-own [Avg-primary-sex-ratios Adult-sex-ratios colony-size]
males-own [Sperm-sex-ratios body-size home-colony num-of-children adult? genotype]
females-own [primary-sex-ratios mating-status? body-size home-colony num-of-exes num-of-children adult?] 

to make-females
ask colonies
[hatch-females round ((initial-colony-size * 90) / 100)
[
set shape "spider"
set color yellow
set home-colony myself
set size 0.8]
]
ask females
[
set body-size mean (list 6 (random-normal 10 2) 14)
set num-of-exes 0
set num-of-children 0
set adult? True
set mating-status? False
]
end

to-report initial-colony-size
report mean (list 20 (random-normal 60 5) 120)
end

to go
make-male-adults
make-female-adults
make-sperm
mate-with-an-adult-female
tick
end


to make-male-adults
ask males
[
if body-size >= 10 [set adult? True]
]
end

to make-female-adults
ask females
[
if body-size >= 10 [set adult? True]
]
end

to make-sperm ; males make a range of sperm-sex ratios ranging from 50:50 to 100:0 female:male sperm
ask males
[if adult?
[set sperm-sex-ratios mean (list (random-float 101)) ]
if sperm-sex-ratios <= 50 [set color black]
if sperm-sex-ratios > 50 and sperm-sex-ratios <= 70 [set color violet]
if sperm-sex-ratios > 70 [set color orange]
]
end

to mate-with-an-adult-female
ask males
[
if adult? 
[
ask females
[
if adult? and num-of-exes <= 4
[
set mating-status? True
set num-of-exes num-of-exes + 1
set color white]
]
]
]
end

问题分析&修正方案 #

你的问题根源非常明确：在make-females过程中，你直接给所有雌性设置了set adult? True，这完全跳过了make-female-adults里的体型筛选逻辑！不管雌性体型多大，刚创建就被标记为成年，自然所有雌性都能满足交配条件里的adult?判断。

修正步骤很简单：

1. 在make-females的雌性初始化代码中，把set adult? True改成set adult? False，让雌性初始状态为未成年：

ask females
[
set body-size mean (list 6 (random-normal 10 2) 14)
set num-of-exes 0
set num-of-children 0
set adult? False  ; 初始设为未成年，后续由体型判断是否成年
set mating-status? False
]

2. 保留make-female-adults过程的逻辑，它会在go过程中被调用，自动将体型≥10的雌性标记为成年，这样只有符合体型要求的雌性才会参与交配。

另外提个小建议：你的mate-with-an-adult-female过程中，成年雄性会遍历所有雌性，只要符合条件就修改状态，这样可能会导致同一个雌性被多个雄性同时选中，num-of-exes被多次累加。后续可以优化成让雄性寻找单个符合条件的雌性（比如附近的），避免重复触发状态改变。

自我解决确认 #

你自己后来也找到了问题所在——就是创建雌性时直接设置了adult = true，确实是这个细节导致了筛选条件失效！

备注：内容来源于stack exchange，提问作者Bharat