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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
% O5 B a( T, f( W( L其中有一段如下, {# z1 z. a0 B" R8 M" |
ask turtles with [ infected? = true ]
# M7 J) Z$ F+ [- Q0 u7 [' P. W我原本以为这句会回传『所有』infected? = true 的 turtle
$ f# M8 q6 W, v" p- O' O3 t8 E. o但看结果似乎不是这样。
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假设所有符合条件的有 5 笔
# ?, W/ p# Q+ x+ m; s3 @* H% _有时候回传 1 笔,有时回传 3 笔,是不固定的; W4 f! f+ }, d; u! P0 w# k
回头查语法定义
- I9 ?1 Z4 H. h& n ]# `with
$ n0 y, ^3 O: H/ {3 X( u' eagentset with [reporter]. z4 b1 p% \" B( s( p+ q
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.
- O: A5 w: Y( M- l! g# ?8 r它只说回传 agents satisfying the given condition
2 m/ ]6 ^, l: O6 h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
& ~0 `5 \& A5 u9 A谢谢!/ N, N# w, y: P3 C
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