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新手发问超简单问题,目前还处于研读范例码的阶段,边测边看结果来理解程序$ i" l p1 y* x9 |
其中有一段如下5 m+ x4 C9 N+ _
ask turtles with [ infected? = true ] % S' w6 C' W! ]
我原本以为这句会回传『所有』infected? = true 的 turtle
$ ]( q( W5 o+ t. p' m N但看结果似乎不是这样。1 m. V& F7 c2 F4 r p3 w
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假设所有符合条件的有 5 笔5 ?7 ~/ P- F7 g& h
有时候回传 1 笔,有时回传 3 笔,是不固定的. d1 R& Z$ |4 a" p1 }4 Q$ T/ Q- o& V) `
回头查语法定义5 X- e1 x8 C- i- J
with : b5 D; C( S& W+ ~ e; f" g( I
agentset with [reporter], i9 l. o5 E; n! O/ H
Takes two inputs: on the left, an agentset (usually "turtles" or "patches"). On the right, a boolean reporter. Reports a new agentset containing only those agents that reported true -- in other words, the agents satisfying the given condition.
- X7 W) a0 n5 T0 H$ e) t3 ?% d它只说回传 agents satisfying the given condition
& R/ ^' t1 E' j是否 with 回传的是『符合条件』的数据,而不是『所有符合条件』的数据 ? 4 y3 O7 O6 m: ]& t, c
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想确定一下# a8 x+ _& x4 R* A
谢谢!
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