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我想计算乌龟所在的多边形与乌龟所在的多边形周围2公里半径内的每个多边形之间的边到边距离。多边形由不同的 ID 表示，每个多边形由几个补丁组成。我收到带有以下代码的错误消息“FOREACH 期望此输入是一个列表，但得到了一个代理集”。我不明白为什么“带有 [plabel = ID-polygon]) 的补丁”不是一个列表？事实上，我想选择标签等于多边形标签的所有补丁。谢谢您的帮助。

to-report create-edge-turtles [ID-polygon] 
let edge-turtles nobody
ask ID-polygon [ 
foreach (patches with [plabel = ID-polygon]) [
foreach sort neighbors [ 
sprout 1 [
  if [plabel] of neighbors != ID-polygon [
    face ?
    fd distance ? / 2
    set edge-turtles (turtle-set edge-turtles self)] ] ] ] ]
report edge-turtles
end code here

to-report edge-distance-between-polygons-in-buffer [indvidual]
ask individual [ 
set list-ID-polygon-in-buffer ([plabel] of patch-here in-radius 2) 
set list-ID-polygon-in-buffer remove ([plabel] of patch-here) list-ID-polygon-in-buffer 
foreach list-ID-polygon-in-buffer [ 
let ID-polygon-with-individual ([plabel] of patch-here) 
let ID-polygon-in-buffer ?  
let edges-polygon-with-individual create-edge-turtles ID-polygon-with-individual 
let edges-polygon-in-buffer create-edge-turtles ID-polygon-in_buffer 
set distance-patches min [ min [ distance myself ] of edges-polygon-in-buffer ] of edges-polygon-with-individual 
ask edges-polygon-with-individual [ die ] 
ask edges-polygon-in-buffer [ die ] ] ]
report distance-patches
end
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1 回答 1

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命令

patches with [plabel = ID-polygon]

返回一个代理集，而不是一个列表。要将代理集转换为列表sort，只需使用关键字即可

sort patches with [plabel = ID-polygon]
于 2013-09-30T18:47:41.517 回答