将变量放入表时出错，只允许常量？

Question

目前我正在开发一个 Netlogo 程序，我需要使用节点和链接来解决车辆路由问题。 （链接在程序中称为街道）

这里我有一些实际问题，如何在具有另一个节点的表中输入变量链接速度。像 200 等常数就可以了。我在网上找到了一些使用变量的示例，但我不知道为什么我不断收到以下错误：

期望一个常数。

（或者为什么 netlogo 需要一个常量）

这是相关的代码片段：

extensions [table]
streets-own [linkspeed linktoll] 
nodes-own [netw]

;; In another piece of code linkspeed is assigned successfully to the links

to cheapcalc

  ;; start conditions set costs very high 300000

  ;; state 3 unsearched state 2 searching state 1 searched (for later purposes)

  ask nodes [ 

    set i 0 set j count nodes set netw table:make


    while [i < j][


    table:put netw (i) [3000000 3]   set i (i + 1)]]  


  set i 0 let k 0

  ask node 35      ;; here i use node 35 as an example. 

                   ;; node 35 is connected to node 34, 36, 20 and 50

     [table:put netw (35) [0 1]   ;; node need to search costs to travel to itself 

                                   ;; putting constants is ok. 

     while [i < j]

        [ask my-links 

           [ask both-ends 

              [if (who != 35) [set color blue     

;;               set temp ([linkspeed] of street 35 who)    ;; here my real goal is to put this in stat of i. but i is easier than linkspeed. 

                 table:put netw (who) [ i 2 ]

                 ]              

           ]  ]


      set i (i + 1)] ] ;; next node for later, no it is just repetition of the same. 


end

我希望有人知道发生了什么......

Answer 1

问题很可能不是将变量放入表中，而是将变量放入列表中（然后将其放入表中）。

将下面的行：更改

     table:put netw (who) [ i 2 ]

为：

     table:put netw (who) (list i 2)

This - (list i 2) - 允许您生成其中包含变量的列表，您不能以其他方式执行此操作 - [i 2]。

希望这有帮助。