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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
: N: q" U, Y" S' c其中有一段如下3 D. o& { }" c% g) h4 F
ask turtles with [ infected? = true ]
( h+ C6 T- c6 O5 |' Z我原本以为这句会回传『所有』infected? = true 的 turtle
7 a8 j* ]& o0 [3 s: w但看结果似乎不是这样。
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0 B' ~. w$ _! U5 k假设所有符合条件的有 5 笔" B8 b5 t+ {5 u
有时候回传 1 笔，有时回传 3 笔，是不固定的- e5 m3 F6 N2 h
回头查语法定义% a( P9 `8 Z& f! d' t! I2 D
with
7 l; ~' f3 ]. Y* F0 cagentset with [reporter]
, u+ ~) y1 A4 l8 e" u9 PTakes 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.
+ d6 v" M# @& n& X/ ]4 E! p它只说回传 agents satisfying the given condition0 R6 ?2 P1 R7 @1 ]
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 ? ; j2 s! A3 _: h/ v+ c( N
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想确定一下
2 @) G) X2 w& u: ?, n! p: y' K5 j谢谢！. m; n/ M) ]7 l' x2 k% d" M3 M
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楼主
发表于 2013-11-7 00:02:20
