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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2 B4 T/ O$ l& d$ o
其中有一段如下7 P1 m- c9 T' i! F* j( T6 j. F
ask turtles with [ infected? = true ]
. u4 o' q% I5 q" t: m' A. s' R6 w! n我原本以为这句会回传『所有』infected? = true 的 turtle
. K3 e8 C' e& T3 @1 U+ N F+ E9 x1 I& a但看结果似乎不是这样。
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& P! Y' b6 {7 y- C! F. f4 x9 m假设所有符合条件的有 5 笔
/ F( E3 L" B) `- M* s/ N5 m有时候回传 1 笔,有时回传 3 笔,是不固定的4 n% B' P* R3 q9 m
回头查语法定义! \2 M% W6 v5 I
with 9 E/ b! ~. ?# t8 E: g! g$ w C% W
agentset with [reporter]! }; {, v3 s" I7 Q" y. t8 i/ ?
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.4 _9 F% l& Z% ]- b
它只说回传 agents satisfying the given condition* I/ }0 @7 \) L6 t9 k9 v" ~
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 ?
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想确定一下' D4 ]5 y: I2 R) [) ?5 {% z) Y; F
谢谢!
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