我编的程序如下turtles-own [energy]
& |) X/ b6 q' x6 j9 F' j3 Pto setup
7 w# O) h- D1 I N) e) u clear-all
8 O* F d! L8 t, T( \& }8 S setup-patches0 G# X# _4 `- z3 A; m& n
create-turtles 100
C) C# ~/ M) I0 I) \/ K do-plots
- J( R1 v7 b( k8 ~ ask turtles [ setxy random-xcor random-ycor ]8 b+ R W6 _% P, B
end; l4 H5 k+ x2 ~) F$ T
to go: ~0 F5 p. x$ q( | |% S7 O0 W
move-turtles* X; K. q0 v$ i1 V
eat-grass
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check-death$ c2 O3 ]: \% r6 Y
regrow-grass. P& S( N7 t/ G: j
do-plots
! F5 T' {0 R; x: ?) m G6 |& V2 aend
# J g p4 o+ K5 Dto move-turtles D4 G% s/ [' {8 {1 K0 j
ask turtles [7 A! N' d. V& l4 s3 P
right random 360' q$ g: N3 }# }8 ~
forward 1
% x2 j1 V6 {( L0 o- D: l set energy energy - 13 I; B6 d( C6 J( o; ?6 X& q
]- V! {/ ~1 S1 j+ j$ I
end
0 ~9 A; j7 r# dto setup-patches& o1 P+ O' [! F2 L
ask patches [ set pcolor green ]* r. r& \. ~! q. M8 r' m- j o4 x
end
?: h* |1 }* R# U( C$ Qto setup-turtles7 `9 e8 U# v$ n% w w
create-turtles 100
& U- ~4 K H% x5 E ask turtles [ setxy random-xcor random-ycor ]
4 _* P; i! z4 X0 y( bend$ }- [6 Q, [1 h& I
to eat-grass$ Q( o9 q4 i/ y+ x& ]8 e4 s
ask turtles [! j9 e1 e% Q) B2 ]; L p
if pcolor = green [
+ A: Y" Q- S; T0 ]) L: z* G( [ set pcolor black9 @. R5 l. K% F1 T1 a t8 z
set energy (energy + 10)
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+ z7 D8 ^. T9 ?$ T( h$ a$ U% \* K ifelse show-energy?
! f& L. J; P% R. P4 s [ set label energy ]! Q' ?# `% k/ P( \6 B
[ set label "" ]0 O9 C" v8 G" B( F# D* k2 G: i
]
% F, w* N. Z% K9 A8 Eend% g+ f* m* u' ?
to reproduce% L; Z( W% a- O; u. v9 s2 L
ask turtles [) V) m7 z8 t- [# ]# I& {3 u7 n
if energy > 50 [% j4 g0 R( d. v" k* X
set energy energy - 50
. J; V' R# s) A hatch 1 [ set energy 50 ]
4 A2 V! M l2 @+ ^ ]' k/ d5 ]/ q% |! S U
]7 M3 h: U- j$ p/ z4 [, A+ e L
end% ~% A4 z0 D# b+ @8 T x6 l
to check-death
( e# k, l$ `1 h, [. N ask turtles [: C" ^0 S y7 E9 R
if energy <= 0 [ die ]
' A$ q3 T0 e- O8 k* n ]
) F' X: B" W: Rend
3 k' S& _! A" U- jto regrow-grass: L! ?! ~1 p' j' N9 @( i* O
ask patches [7 l3 l) o# r4 o
if random 100 < 3 [ set pcolor green ]+ g: _1 U. J, n
]
" I' ?9 |/ w9 send# z$ b% C" H7 }" L2 E
to do-plots
2 x6 ^' n7 l$ k: ] set-current-plot "Totals"3 I& E0 r$ I/ j( |
set-current-plot-pen "turtles"
! Z2 j B- U+ w5 v- f8 B plot count turtles' o3 Y* m, W4 H) m% @
set-current-plot-pen "grass"2 [9 }. B$ `" f- p
plot count patches with [pcolor = green]
5 _ s( m$ n d2 c8 Jend
- f# O+ {: a+ A5 r可是运行时提示no such plot: "Totals"
5 m: y) H4 q* X: B$ ?6 M1 S& h; ^error while observer running SET-CURRENT-PLOT
0 G ^$ n: O9 @ s# }- r, S# @ called by procedure DO-PLOTS# h% t: c4 w2 U0 L- g" H
called by procedure SETUP
& F S \% y# Q4 V, b& s) b called by 按钮 'setup'7 Y2 L- r1 @; n. r
求大神解答啊 |