使用 netlogo 获取全局变量的颜色

Question

我正在尝试获取全局变量的真实颜色。

这是我的代码：

breed [players player]

globals [
INITIAL-POSSESSION ;
]

to setup
  clear-all
  reset-ticks
  set-initial-possession
end

to go 
  ticks
  ask players [
  decision
  ]
end


to-report initial-possession
  report random 2
end

to set-initial-possession
  ifelse initial-possession = 1
  [ 
    set INITIAL-POSSESSION black]
  [ 
    set INITIAL-POSSESSION white]
end


to decision
 if ([color] of INITIAL-POSSESSION) = black
 [] ;;do something
if ([color] of INITIAL-POSSESSION) = white
[];;do something
end

但是我得到这个错误：

OF expected input to be a turtle agentset or link agentset or turtle or link but got the number 0 instead.

所以我将其更改为（并且有效）：

to decision
 if INITIAL-POSSESSION = 0
  []
 if INITIAL-POSSESSION = 9.9
  []
end

但是还有其他方法吗？（我使用的是 netlogo 6.0）

Answer 1

我认为可能缺少一些代码，所以我无法确认，但看起来您可能没有将 BALL-OWNER 设置为海龟或补丁，而是直接为该变量赋值. of 从代理中查询变量（或从代理集中查询变量列表），因此如果 BALL-OWNER 设置为一个值，NetLogo 会感到困惑。但是，如果您确实将代理分配给 BALL-OWNER，您的方法应该可以正常工作。例如，尝试运行下面的代码：

to setup
  ca
  crt 10 [ 
    setxy random-xcor random-ycor
    set color one-of [ red blue ] 
  ]
  reset-ticks
end

to go
  let ball-owner one-of turtles

  ifelse [color] of ball-owner = red [
    print "red team has possession"
  ] [
    print "blue team has possession"
  ]
end

编辑： 你绝对可以使用 global 来选择颜色，就像你在第二个代码块中所做的那样 - 我只是想指出 of 专门绑定到 agents。如果你想把一个颜色存储在一个global变量中用于比较，那是可以的，只是你的比较比使用of:

更简单

globals [ initial-possession ]

to setup
  ca
  crt 3
  set-initial-possession
  reset-ticks
end

to go 
  ask turtles [
    decision
  ]
end

to set-initial-possession
  set initial-possession ifelse-value ( random 2 = 1 ) [black] [white]
end


to decision
  ifelse initial-possession = black [
    print "I see that black has possession"
  ] [
    print "I see that white has possession"
  ]
end

我不确定这是否有帮助，这可能首先取决于您在 global 中存储颜色的目的！

使用 netlogo 获取全局变量的颜色

Get color of global variables with netlogo

netlogo