我编的程序如下turtles-own [energy]' r, b/ ]) F, q3 E+ b- w- T
to setup
. g- |: y( W8 l& c0 d% d( n7 [. q clear-all/ v" ]5 x2 [9 j0 N8 r( \+ z
setup-patches# y7 q- t" f, O/ @ X6 u/ k5 h
create-turtles 100& X+ O( v. X7 N* C9 ?/ V
do-plots
! F E" e1 Z- c0 D6 J" [0 ~ ask turtles [ setxy random-xcor random-ycor ]. ]( ~7 Z9 A! {. J$ o
end
- r7 {8 T8 Y. `9 C7 [, d- I: tto go4 E$ r4 E N. `
move-turtles
) k: Y4 w& a- E, b) V eat-grass4 D- o3 y" A; t* g5 W+ W
reproduce f- H; h; _( t
check-death5 V& u2 l8 F: f" Y
regrow-grass( ]4 t3 y6 @8 R3 \1 r% h
do-plots
; N& S$ M% d7 w, U# X6 J1 send
# D2 N$ F1 R3 c2 J5 n2 c0 Ato move-turtles* b) G1 l5 W8 V) L
ask turtles [. ]1 Z! F1 k7 d5 ]3 ?
right random 360; B! ~) X, A0 Z( H
forward 1
- Z( A8 T& l& s! @6 C9 V) q* k set energy energy - 1
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end! ?' E. M, \' n/ V5 e A
to setup-patches
) |6 Z0 D9 b6 Q' l3 L ask patches [ set pcolor green ]6 x6 q3 z! S9 u: d6 {( @+ z
end
; x# y" G/ {; }: s9 T$ X; ^! z9 mto setup-turtles
; P2 ?/ U" ]+ p7 c: w( u create-turtles 1009 L4 l) |; R4 ?( ^) l1 S
ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass3 W' k/ }: D- L6 r( Y/ ?5 S
ask turtles [
6 {) {+ a' y( b; y: T if pcolor = green [
, X" B! E% _+ I* _0 F7 O set pcolor black1 u, {8 C" |2 m% u% r8 `
set energy (energy + 10)% j- L4 D2 I' E% u. k4 M5 L
]
! Z, [* e; e9 s ifelse show-energy?1 Q5 m& f: E5 ` u9 F% s$ z! P; P
[ set label energy ]
]7 W' D/ B' b- o% i7 n, W [ set label "" ]
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end
3 I7 x7 S/ e; z/ D5 o7 pto reproduce
9 f0 w2 i- [' r/ s( ]5 M/ k ask turtles [
5 d/ |0 s0 ]5 G if energy > 50 [
7 U, M+ `9 T3 D2 e7 W' _3 D h2 ^ set energy energy - 50
$ n7 K, v! j" ^ ?0 U& p hatch 1 [ set energy 50 ]$ V. n6 o3 N9 J1 R- y2 Z6 [
]0 K/ q1 M/ m, }5 W Y: C2 Y
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end/ w" h) V7 ~. F3 B" k3 ~$ ^: n
to check-death
- `4 v) U! ~3 x9 r4 w& `9 s# A ask turtles [6 l5 J; l: A7 |) D9 W1 {! o, U
if energy <= 0 [ die ]6 b% Q- z/ r5 n. |, I1 H
]! F- T# w: n; K- C5 h* q1 [
end
6 S% t; j w# W7 Q, C. p% L! Mto regrow-grass
7 \% M+ z7 R: ~" U! v* Z ask patches [ ]# H+ C4 B) c
if random 100 < 3 [ set pcolor green ]
5 e8 Z9 c4 m9 d! ]- g ]3 K" {; E" `1 ^
end
4 c& a' F0 J' n# R l: v3 lto do-plots
1 \. w& j. ]1 m) z! s set-current-plot "Totals"
! p1 @/ i1 e9 l set-current-plot-pen "turtles"
$ k" F. z4 _: V plot count turtles
# G6 h1 K9 c9 k ^ set-current-plot-pen "grass"
- Q( r3 u$ M m; ] plot count patches with [pcolor = green]
( E; V* y7 @- `+ K, W/ K0 ?3 d: ^end; m) u8 m1 T5 `- T
可是运行时提示no such plot: "Totals". c2 J& v6 u2 \5 M6 ^
error while observer running SET-CURRENT-PLOT, f8 S' U8 V6 k- L+ x, c
called by procedure DO-PLOTS
1 p3 B) N+ j* i, @/ I0 @ called by procedure SETUP, z; D/ W+ E7 h2 b0 \
called by 按钮 'setup'! b: B0 y- i, [" n0 f
求大神解答啊 |