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？
; F6 j0 M; q  t* X

turtles-own [ energy ]
to setup
clear-all
set-default-shape turtles "square"
. ~; I& w3 [, m2 }; qcrt nutrition
: `3 p( z4 Y- {; \! Gask turtles[
, r. x. c% d3 _# y' h/ s    set color white
/ M2 \% e6 T$ o0 I( y2 S" a3 ~- a    setxy random-pxcor random-pycor]
0 o3 ]% Q. U3 x; ~/ P* B  
ask n-of microbes-initialization patches
    [ set pcolor green]
ask turtles [set energy  1]
1 ~, T! p) j: S. W/ w. M0 e: Z; ], }end

6 q, x$ z# P. p7 X* E0 gto go
    ask turtles [set heading 90 * random 4    fd 1]
! {/ i- n0 G; E     ask patches  with [ any? turtles-here]
    [  if pcolor = green and random 100 < chance-of-congregating [tt ]]
     ask turtles [ if energy = 0  [die ]]
end

to tt
ask patches [set pcolor gray ]
ask  turtles [set energy energy - 1]
end
# l! F( J  v; }; O. `3 K: V

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