turtle粘合patch的运动问题

lincw

请问：
, ~2 r& D6 w  i8 I9 w; Q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？
4 [1 T/ E6 k: z+ i
! b1 Z4 s1 G/ R$ G: I
turtles-own [ energy ]
to setup
clear-all
set-default-shape turtles "square"
- ]1 L, L! C$ m3 Scrt nutrition
( r$ @/ p( {, [/ U0 i5 yask turtles[
# x8 O2 }3 [( ^* ~! g$ [: \    set color white
' C& Y' v- p! Q! h3 M    setxy random-pxcor random-pycor]
4 y6 M/ a6 N( u# H. Z" H  
8 e! X' K: C. T, @" L- ?$ }ask n-of microbes-initialization patches
: I, _. V  e7 c: K: f    [ set pcolor green]
2 ^$ E& ?  L6 Y2 F( E ask turtles [set energy  1]
* f: w$ n8 E& i% j/ s: \8 Fend

$ M& x# \  p6 k4 q% [8 j4 W4 M( ito go
6 B$ M* d  m$ k# x; l! q. Z    ask turtles [set heading 90 * random 4    fd 1]
     ask patches  with [ any? turtles-here]
( s$ ~* X, \  c- L+ q# [5 L) x2 A    [  if pcolor = green and random 100 < chance-of-congregating [tt ]]
     ask turtles [ if energy = 0  [die ]]
" H1 E* E9 O, F/ q9 {2 v+ B end
& i8 ~) o8 M! |& |: W
to tt
ask patches [set pcolor gray ]
ask  turtles [set energy energy - 1]
, w8 O7 v* z4 w0 M7 b5 bend
' I0 P: J2 l  u

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