|
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
* A8 C9 J7 M) R2 u/ r其中有一段如下1 A# g9 h) V7 }
ask turtles with [ infected? = true ] 6 l5 z. o3 e. ~
我原本以为这句会回传『所有』infected? = true 的 turtle
& }& ?0 H- b, U3 m7 |但看结果似乎不是这样。
0 _+ n$ F( w& E# ?. k$ r" m g; p& {$ R. j
假设所有符合条件的有 5 笔5 `" g/ f% _4 {4 _, H
有时候回传 1 笔,有时回传 3 笔,是不固定的
( Q) b" y, x4 S回头查语法定义
$ ~* v6 z+ a' M6 t2 z3 e: `% E" ~$ Ywith
! ?) O( Z6 k- J n8 z4 Y& Z0 X3 s. Kagentset with [reporter]% d& o2 }& Y3 O& |9 y# X( u" H; J
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.& M/ y' @+ O) y) D2 y' [' |5 l
它只说回传 agents satisfying the given condition" v, N5 s* g4 X1 S6 M P! \
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 ? 0 S x2 B. K+ @4 s
9 c; v3 n, O2 v+ }, ?1 a" w6 U2 R9 q想确定一下* p2 Z5 T& |, @
谢谢!
* h$ W, ?8 F% i! W( Z |
|