抱歉，如果这很明显，我已经搜索了我能想到的所有内容并问了一位同事，我们都陷入了困境。
我有一些我想运行行为空间的代码（下面 - 对狼羊捕食的轻微扭曲）（输入也在下面）。但是，它永远不会运行到完成。它似乎总是卡在运行的第 0 步（卡住的运行 # 不同）。如果它们单独运行（因此所有变量看起来都很好），它所坚持的运行就可以正常工作。它似乎只是冻结（不产生错误消息，也不会崩溃）。
任何想法是什么原因造成的？
谢谢，
西蒙
代码：
globals [grass] ;; keep track of how much grass there is
;; Sheep and wolves are both breeds of turtle.
breed [sheep a-sheep] ;; sheep is its own plural, so we use "a-sheep" as the singular.
breed [wolves wolf]
turtles-own [energy] ;; both wolves and sheep have energy
patches-own [countdown]
to setup
clear-all
ask patches [ set pcolor green ]
;; check GRASS? switch.
;; if it is true, then grass grows and the sheep eat it
;; if it false, then the sheep don't need to eat
if grass? [
ask patches [
set countdown random grass-regrowth-time ;; initialize grass grow clocks randomly
set pcolor one-of [green brown]
]
]
if fences?[ ; this code adds in blue fences to create patches of various size (if fences are turned on). Turtles cannot pass over fences
ask patches with [pxcor mod connectivity2 = 0]
[ set pcolor blue ]
ask patches with [pycor mod connectivity = 0]
[ set pcolor blue ]
]
set-default-shape sheep "sheep"
create-sheep ((count patches - (count patches with [pcolor = blue])) / 25) ;; create the sheep, then initialize their variables. The starting density always remains constant despite a varying world size
[
set color white
set size 1.5 ;; easier to see
set label-color blue - 2
set energy random (2 * sheep-gain-from-food)
setxy random-xcor random-ycor
]
set-default-shape wolves "wolf"
create-wolves ((count patches - (count patches with [pcolor = blue])) / 50) ;; create the wolves, then initialize their variables. The starting density always remains constant despite a varying world size
[
set color black
set size 2 ;; easier to see
set energy random (2 * wolf-gain-from-food)
setxy random-xcor random-ycor
]
display-labels
set grass count patches with [pcolor = green]
reset-ticks
end
to go
if count wolves = 0 and count sheep = 0 and ((count patches with [pcolor = green]) = (count patches - (count patches with [pcolor = blue]))) [ stop ] ; stop model when the whole world has flipped to grass
ask sheep [
move
if grass? [
set energy energy - 1 ;; deduct energy for sheep only if grass? switch is on
eat-grass
]
death
reproduce-sheep
]
ask wolves [
move
set energy energy - 1 ;; wolves lose energy as they move
catch-sheep
death
reproduce-wolves
]
if grass? [ ask patches [ grow-grass ] ]
set grass count patches with [pcolor = green]
tick
display-labels
end
to move ;; turtle procedure
rt random 50
lt random 50
ifelse [pcolor] of patch-ahead 1 = blue
[ move] ;; If there is a blue patch ahead of you, choose another random direction
[ fd 1 ] ;; Otherwise, it is safe to move forward.
end
to eat-grass ;; sheep procedure
;; sheep eat grass, turn the patch brown
if pcolor = green [
set pcolor brown
set energy energy + sheep-gain-from-food ;; sheep gain energy by eating
]
end
to reproduce-sheep ;; sheep procedure
if random-float 100 < sheep-reproduce [ ;; throw "dice" to see if you will reproduce
set energy (energy / 2) ;; divide energy between parent and offspring
hatch 1 [ ifelse [pcolor] of patch-ahead 1 = blue ;; hatch an offspring
[ move] ;; If there is a blue patch ahead of the offspring, it chooses another random direction
[ fd 1 ] ;;If not, offspring move forward 1 step
]]
end
to reproduce-wolves ;; wolf procedure
if random-float 100 < wolf-reproduce [ ;; throw "dice" to see if you will reproduce
set energy (energy / 2) ;; divide energy between parent and offspring
hatch 1 [ ifelse [pcolor] of patch-ahead 1 = blue ;; hatch an offspring
[ move ] ;; If there is a blue patch ahead of the offspring, it chooses another random direction
[ fd 1 ] ;;If not, offspring move forward 1 step
] ]
end
to catch-sheep ;; wolf procedure
let prey one-of sheep-here ;; grab a random sheep
if prey != nobody ;; did we get one? if so,
[ ask prey [ die ] ;; kill it
set energy energy + wolf-gain-from-food ] ;; get energy from eating
end
to death ;; turtle procedure
;; when energy dips below zero, die
if energy < 0 [ die ]
end
to grow-grass ;; patch procedure
;; countdown on brown patches: if reach 0, grow some grass
if pcolor = brown [
ifelse countdown <= 0
[ set pcolor green
set countdown grass-regrowth-time ]
[ set countdown countdown - 1 ]
]
end
to display-labels
ask turtles [ set label "" ]
if show-energy? [
ask wolves [ set label round energy ]
if grass? [ ask sheep [ set label round energy ] ]
]
end
; Copyright 1997 Uri Wilensky.
; See Info tab for full copyright and license.
行为空间输入：
变量：
["world-width" 51]
["fences?" true]
["wolf-gain-from-food" 20]
["sheep-reproduce" 7]
["show-energy?" false]
["grass?" true]
["connectivity" 10 25 50]
["wolf-reproduce" 5]
["grass-regrowth-time" [1 1 100]]
["sheep-gain-from-food" 4]
重复：1
记者：
count wolves
count sheep
count patches with [pcolor = green]
测量在每一步运行
设置：setup
去：go
停止（我试过有没有这个）：count wolves = 0 and count sheep = 0 and ((count patches with [pcolor = green]) = (count patches - (count patches with [pcolor = blue])))
时限：5000