我编的程序如下turtles-own [energy]
; h7 U. Q6 H# _2 kto setup2 D+ q) H; ^, j& P
clear-all
6 W" j$ y: a, ~& N setup-patches! c6 d& ~' e; J( X+ s6 ~
create-turtles 100
: D0 b/ P1 z& S5 M( X% Y do-plots9 e0 n9 N& ^) J8 Q: f% O5 v
ask turtles [ setxy random-xcor random-ycor ]
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to go
! L; l8 s6 J) H8 ^. H) X* G4 @3 w% V. h move-turtles& l5 c/ n7 {% V3 N8 E. X
eat-grass) X% m# A) O3 |
reproduce
( k1 v/ G7 ^/ a* w6 S! z check-death
4 u* o+ h/ k6 W5 L regrow-grass: L9 x" ]/ W/ g' D
do-plots4 a* K3 c# O1 h+ p# R
end' L e' Y, t3 Z; `) l1 H# X
to move-turtles
0 D- D; W1 m4 X* F5 i/ k! C$ @) [, T ask turtles [
7 I7 m- j* ], y5 b right random 360
2 @, W+ P% I# U% e4 I forward 16 ]9 V6 ~, o/ j; x
set energy energy - 13 Q7 M; c2 ~, r" g, }- A
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end
4 a' O$ x$ C- x3 g# bto setup-patches" G& W0 l+ w# e
ask patches [ set pcolor green ]4 i! Q* a& }: ^
end
) j* s# o9 ^) t; ]9 h; [to setup-turtles
! n' L. E; H2 d9 z' C4 m create-turtles 100) u- G* _$ h1 U- J$ Z- |8 w
ask turtles [ setxy random-xcor random-ycor ]( v6 s$ V8 f0 H3 K3 n9 p
end
8 r6 ^* @ n9 s1 Q5 Dto eat-grass
& r, V g3 p7 C0 g8 ` ask turtles [
8 z+ E" w% r( { if pcolor = green [
, Z( D: w% D% H8 _3 d3 f set pcolor black% i) H/ t @ _6 H# s w
set energy (energy + 10) w" F2 P( [. u/ b' L
]
: t% s: d# e6 P) r ifelse show-energy?( p, e# O) L( r5 i4 h5 K
[ set label energy ]
( n( l: E/ P; ^/ \0 C, C0 t$ x0 q [ set label "" ]/ T5 ]9 x# H) L: g2 v
]3 O$ J, _# f3 {7 p- C
end
5 z% C w' E) p+ {/ Y1 y# A; tto reproduce/ s' j5 {9 [5 H. N
ask turtles [
* K" f( ~) R! Y if energy > 50 [: n. O' Z- j" V5 X
set energy energy - 50
4 H% r e: r" K8 y$ z hatch 1 [ set energy 50 ] Z& e8 \3 `9 S3 N% F6 h
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]
) R; B, I9 A5 u4 ]! K {# a, uend; d) J c1 n; l+ r L# H/ s! D
to check-death
T) e- Z# I2 F' G% @" J& z8 \ ask turtles [9 j) o" m) ]% ?- c) r& Y7 O
if energy <= 0 [ die ]2 ~7 ~* \. n! u5 H1 H
]
: N7 S$ L) M3 o5 v3 f1 ~5 Pend) {7 @) ^! G0 H1 r: K0 t! }$ x6 L
to regrow-grass
; |# ^$ A! {8 |8 H, Y7 P ask patches [
9 p2 |5 y5 b, r: u if random 100 < 3 [ set pcolor green ]: w$ S: [& L6 h1 c1 j! @- [
]0 z. ^6 B1 x! ~! v
end
! }$ a% L; X% X' _1 l$ f" Nto do-plots
- }; b% R' W4 M9 f4 n set-current-plot "Totals"0 R3 s3 T0 ]* p
set-current-plot-pen "turtles"- T5 N& d6 y; T2 S7 n5 [! C2 x' s
plot count turtles
. o; n6 ]9 q4 w' q set-current-plot-pen "grass". U0 m; S D9 u1 W
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals" d4 t) Y# ]! U; \$ ?- o
error while observer running SET-CURRENT-PLOT
4 v, A' C# o& {8 q5 u called by procedure DO-PLOTS
. v: [2 h" c# I0 @% Q called by procedure SETUP
' F3 K8 x% {7 I5 J8 J called by 按钮 'setup'
( Y0 z. _. s N9 ^- u求大神解答啊 |