如何进行NetLogo海龟的密度聚类评估？

Question

我在netlogo 6.0.1中使用dbscan（基于密度的集群）扩展来测量世界界面上的海龟之间的集群效应和集群分布属性。

extensions [ dbscan ] 

to setup 
    clear-all 
    ask patches [ set pcolor white ] 
    create-turtles 1000 [ 
    set color black 
    set label-color blue 
    setxy random-xcor random-ycor 
    ] 
    ask n-of 5 turtles [ 
    ask turtles in-radius 3 [ 
     set color one-of [red grey] 
    ] 
    ] 
end 

to-report radial-extent [ cluster ] 
    report max map [ 
    a -> max map [ 
     b -> [ 
     distance a ] of b 
    ] 
    cluster 
    ] 
    cluster 
end 

to find-clusters 
    let red-grey-turtles turtles with [ member? color [red grey] ] 
    let clusters dbscan:cluster-by-location red-grey-turtles 3 3 
    (foreach clusters range length clusters [ [c i] -> 
    foreach c [ 
     t -> ask t [ 
     set label i 
     ] 
    ] 
    ]) 
    let num-clust length clusters 
    let max-clust-count max map length clusters 
    let mean-clust-count mean map length clusters 
    let var-clust-count variance map length clusters 
    let stdev-clust-count standard-deviation map length clusters 
    let max-clust-size mean map radial-extent clusters 
    let mean-clust-size mean map radial-extent clusters 
    let var-clust-size variance map radial-extent clusters 
    let stdev-clust-size standard-deviation radial-extent clusters 
end 

然而，当我运行代码，我不断收到以下错误：

OF expected input to be an agent or agentset but got the list [(turtle 3) (turtle 19) (turtle 93) (turtle 186) (turtle 239) (turtle 243) (turtle 322) (turtle 326) (turtle 528) (turtle 587) (turtle 610) (turtle 712) (turtle 719) (turtle 736) (turtle 754) (turtle 799) (turtle 873) (turtle 874) (turtle 887) (turtle 889) (turtle 963) (turtle 18) (turtle 140) (turtle 156) (turtle 530) (turtle 557) (turtle 605) (turtle 687) (turtle 693) (turtle 919) (turtle 979) (turtle 252) (turtle 506) (turtle 978) (turtle 989) (turtle 14) (turtle 534) (turtle 586) (turtle 658) (turtle 133) (turtle 606) (turtle 702) (turtle 995) (turtle 597) (turtle 949) (turtle 160) (turtle 244) (turtle 703) (turtle 742) (turtle 902)] instead.

显然径向范围函数被处理龟簇列表，而不是代理设置因使用of算子来确定出簇半径。

有关如何解决此问题的任何想法？

Answer 1

好消息：您的记者是OK ...

...只是纠正最后一行

let stdev-clust-size standard-deviation radial-extent clusters 

到map记者在clusters：

let stdev-clust-size standard-deviation map radial-extent clusters