我编的程序如下turtles-own [energy]
* N. d) b! U- p/ |1 Uto setup
6 }' f. d( u- c+ ~ clear-all% ?8 g0 Y; C% h9 d
setup-patches
4 t: g+ G2 e% C6 a ? create-turtles 100
6 V) G( C6 v* D4 x: O' _6 z ? do-plots2 o( ^9 a% B# L2 F2 S
ask turtles [ setxy random-xcor random-ycor ]" G0 k/ H$ h, u0 [' h: ] Q
end
9 X0 i3 R% Y B% }& |! D' |5 [to go, v' S' x/ M. K" _' j- y5 F8 _2 `
move-turtles
7 s2 I& l: c+ @- ~ eat-grass
c2 c9 w) n0 |% T4 c reproduce
" {( @ T9 w7 X- {( i# v' l& a check-death; l0 H1 H& Z) L1 H/ f4 x) l; W
regrow-grass& ~' [* Q& D% W( u7 y
do-plots
2 p# t. I( i; W3 ^7 |6 U* Oend
, F# ^$ n6 _0 K! w% Z7 W. [to move-turtles6 V4 X5 M, p2 Q _
ask turtles [1 c5 B2 v& d6 p D
right random 3601 v3 z" e: k2 M, Z, _5 k% k' e9 S c
forward 1 c% u) K E9 X( A
set energy energy - 1
/ G0 Z( I4 n; N& n0 ~: M: ^ u9 n5 y ]7 C q% Z% X- Q
end
@8 w$ o1 i! o* vto setup-patches
8 F( p0 \% V0 `0 s% e T- V8 \ ask patches [ set pcolor green ]
) Q% Q6 s/ x% r: c3 K- p1 \# Vend- D* `, {. |( j( ^% n/ _
to setup-turtles
" g4 W$ Q5 W* B" V/ m4 Z$ B: s create-turtles 1009 t7 Q7 X+ N) `
ask turtles [ setxy random-xcor random-ycor ] k, G+ J. e9 c* U
end
" y0 X* W9 u( D5 A$ b9 O$ E2 Tto eat-grass
& W0 b: g1 E, ]! o ask turtles [1 J" }9 U7 A0 }. ]
if pcolor = green [# C% @# e3 d6 _0 D; z6 A
set pcolor black
8 C, t: O( w+ Y+ y set energy (energy + 10)& q$ c4 D9 c5 c
]
- a6 m9 d' i! _9 A5 O8 e ifelse show-energy?. Z0 g, T6 B# @! J
[ set label energy ]
8 y+ u. j: w+ u/ e) a$ O- a$ _1 ^' N [ set label "" ]
8 {& b: O- ], U4 x3 e4 T ]7 ^3 F" ~% \+ I$ X: b- q
end3 _9 e9 t* }* i* m: b. Z
to reproduce b0 O. @; n* p6 S+ L6 ^" A" o# Z" e
ask turtles [
; g2 Y. Y3 ?+ x3 F2 \ if energy > 50 [
E( p W6 N% C8 w0 Q5 l! l0 Y set energy energy - 50
) _$ F" y/ k; g; E* G8 Y5 k1 Z, G hatch 1 [ set energy 50 ]1 `9 I6 [3 r$ b2 w ?8 A
]: \! q2 U7 `/ w& z
]
3 c+ y3 x ?. Z# o1 d0 w( Dend
/ ? z( V& a/ F' Ato check-death
" R9 `, z0 v5 {# t/ | ask turtles [9 x8 _7 A* Z5 @: y
if energy <= 0 [ die ]
! C q& R9 I# A1 L ]
+ c1 I$ q8 y* |. t Qend: C- n% P+ G& B- v; s
to regrow-grass2 {, _* [& @* ~& \% u
ask patches [6 p' ~; L4 {. M6 U# y3 s8 V h
if random 100 < 3 [ set pcolor green ]9 r+ i# m: ]4 b4 R
]; Q; I% z3 t8 e! s% Z9 w5 N$ e
end
! _2 Q. d& E9 o6 s+ ]to do-plots! D# D1 n' _# ^- Z9 n; `2 O R
set-current-plot "Totals"
: N3 \+ ~0 {' x set-current-plot-pen "turtles"
9 l6 z9 N' R" J4 w7 b* [ plot count turtles
4 R& _3 S9 |8 R set-current-plot-pen "grass"3 m; b% z" B0 E. b; T) {
plot count patches with [pcolor = green]
, A4 ~7 F- B7 \end
* l1 S9 c1 e4 M) |$ \! Z) j( x9 v2 X可是运行时提示no such plot: "Totals"
9 M2 H0 M" u5 Nerror while observer running SET-CURRENT-PLOT" C1 Q# V! k" I+ M* x6 K4 Y
called by procedure DO-PLOTS$ J2 e- |" j1 D& J9 k! P9 `& a
called by procedure SETUP. Z) B1 I4 ~- O: o% |9 b
called by 按钮 'setup'7 b3 L! j6 I* {# k5 }
求大神解答啊 |