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目前我正在使用Netlogo程序,我需要使用節點和鏈接來解決車輛路徑問題。 (鏈接被稱爲程序中的街道)將變量放在表中時出錯,只允許常量?
這裏我有一些如何在另一個節點中輸入變量linkspeed的實際問題。像200等常數是好的。網上我發現了一些例子,其中使用變量,但我不知道爲什麼我不斷收到以下錯誤:
Expected a constant.
(或原因的NetLogo需要一個常數)
下面是相關的代碼:
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
我希望有人知道是怎麼回事......