turtle粘合patch的运动问题

lincw

请问：
随机产生的turtle 已经在patch的坐标上上下左右一格格运动，当turtle碰到一个随即分布的patch以一定概率粘合,patch变色，其他turtle经过也还是以一定概率粘合的，粘合后turtle的能量就会转变到patch上，并且以一定速率消耗它，怎么编写这个过程？下面是我编写的，运行时就出错了。怎么改正呢？
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turtles-own [ energy ]
; ]' Z- ^" `3 |6 O8 z8 Cto setup
clear-all
% E; L; s+ N( @' f) ~" Dset-default-shape turtles "square"
crt nutrition
ask turtles[
    set color white
$ F4 s3 O+ x5 a+ t" g& {    setxy random-pxcor random-pycor]
4 d# h2 E/ P% }5 _5 U) h/ l  
6 p0 X9 p: e4 A& ^ask n-of microbes-initialization patches
0 ^" Z- |. ~" _  Y0 y/ R: E    [ set pcolor green]
ask turtles [set energy  1]
end
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to go
- h" S! R( ^$ W9 p: q( K. ^# l0 v8 c    ask turtles [set heading 90 * random 4    fd 1]
     ask patches  with [ any? turtles-here]
( {* a6 S( {) [- S1 D7 c6 @' N    [  if pcolor = green and random 100 < chance-of-congregating [tt ]]
) {0 N+ Y& g' {' H& I     ask turtles [ if energy = 0  [die ]]
1 q; N" o" t& {* Q7 a end

to tt
ask patches [set pcolor gray ]
: M; |" m5 N, Q% I  O; v& C" Aask  turtles [set energy energy - 1]
end
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lincw

谢谢楼上两位，后来自己用两种turtle来表示暂时把问题解决了，以后再出现难题再向你们请教啊