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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+ _3 D+ c. m# ~& F; G+ T: I
其中有一段如下* J \! s1 P7 i( s7 L
ask turtles with [ infected? = true ]
7 V- C8 y0 v) ~3 U u我原本以为这句会回传『所有』infected? = true 的 turtle
2 M% [# J" T4 f: C2 B) `( D1 g但看结果似乎不是这样。, F: c4 i2 _% u2 o
: z. k4 n/ z2 S: e. o假设所有符合条件的有 5 笔/ u5 o# z* Z9 C( V; ~
有时候回传 1 笔,有时回传 3 笔,是不固定的8 H i6 a o* s0 H) Q+ F! s
回头查语法定义
" {; B7 a! `& {- E) vwith
/ |/ E! {8 i' |0 dagentset with [reporter]
: {9 ^( v" N1 h, P) hTakes 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.
* z9 H w& e7 U0 \# C) Y它只说回传 agents satisfying the given condition
% @1 Y% i, ~" c, 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 ? 5 L c0 N0 c; m/ |
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想确定一下
+ y& P2 ~1 D6 F: H谢谢!( _" j4 v. I0 n' a7 s3 K, d/ }
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