我编的程序如下turtles-own [energy]& J+ c( _# W3 [8 S
to setup
6 d2 h( m& k% y; p7 f0 o8 _) | clear-all% k8 C. w- ^. V( x1 z0 L
setup-patches
; k( N1 s, q5 X2 J8 n; h% S' r create-turtles 100
4 R5 N9 A* s0 Y0 M2 ?8 k do-plots
0 u. U- o: l" j% Y1 r ask turtles [ setxy random-xcor random-ycor ]
H+ |7 e# N! \; R# }' [, |9 Vend/ @" B2 R+ m& Y6 j9 Y
to go2 M/ O5 E4 O6 V9 N
move-turtles
& x( N- U) E; e- r7 u eat-grass. C% b( {, x6 F. _2 j/ p
reproduce
4 N0 E# r# H* `5 j check-death0 |; D& f* V9 F- f: b8 j- k
regrow-grass! ]: y2 j, h7 n. j$ g+ D
do-plots, l: B4 r0 L ^" G0 C+ \
end
7 d+ Z8 _' Q! Q! ?6 Rto move-turtles! O' D* ^( J8 b6 {
ask turtles [# y% Y9 S9 K# a9 w0 N/ [* W5 \
right random 360
8 t3 u* r3 t+ a; J5 {6 e& L, K forward 1% M( _8 W7 O: I( m! K4 F$ j
set energy energy - 1
+ P3 v# a! d, [3 j ]
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to setup-patches0 Y8 z. ^8 G5 J6 t1 V$ S" A( {
ask patches [ set pcolor green ]
1 x# n+ n& z/ nend
- q# L4 j o- m( i2 h/ Yto setup-turtles' ~, l9 L. w7 Y3 p% x5 D
create-turtles 100
, t8 H) d! X$ Q( @1 ?8 n- p ask turtles [ setxy random-xcor random-ycor ]8 d8 N6 J9 I7 q4 J
end3 O- F8 [& i% z% G
to eat-grass, ]/ g! y* T' b+ O
ask turtles [
1 C3 m8 G$ n2 u! s if pcolor = green [
; o L- S- K- d5 L$ W8 @+ @ set pcolor black
6 ^& I! i' H" \ set energy (energy + 10)" {9 Q( s& U% t: o) F
]
7 d- r2 |: w4 s3 ` ifelse show-energy?
" Y" x1 p5 P0 U# L# B+ ]) s [ set label energy ]' p- `# g8 ^6 e. `# J2 {
[ set label "" ]
6 l# m3 c+ u4 T, P( j ]
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to reproduce0 q9 F2 o5 G: E- V5 q/ D5 F
ask turtles [
1 T( _ J, Z& g2 X if energy > 50 [3 H6 p& V& ~" v4 G
set energy energy - 50
8 U& T. _0 i! x% `4 d, Y8 U+ m0 U F- Y/ @ hatch 1 [ set energy 50 ]. x8 B, q. |) \5 j2 ?8 s
]
4 h2 N/ c& f. d9 ^ ]3 _: \5 c: Y6 L# h, x- ]% R. f6 f# }
end9 s. {5 y( _+ A! }0 V e7 i
to check-death9 w5 }1 h: r5 ]: n9 n
ask turtles [
) W: m v9 Q$ K# |' J7 c if energy <= 0 [ die ]
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end
6 C( Z& h; J# E* V: Rto regrow-grass
5 @& f8 n# j, u1 k$ v# E ask patches [$ X4 F$ S' n) n: G4 m
if random 100 < 3 [ set pcolor green ]% J$ U" U0 y! U0 \
]
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to do-plots
7 w$ k8 z- b2 H* o1 B# t/ V/ u! K set-current-plot "Totals". O. A# M+ g! g
set-current-plot-pen "turtles"
1 w5 l& T4 M5 r plot count turtles
! @% _ n$ Q' u; M set-current-plot-pen "grass"" v- O9 q$ W1 j+ T+ x/ ?/ v
plot count patches with [pcolor = green]/ k6 z& d9 j# q, g* q. h; S
end
1 h. B! K! S# F# E ]. Q, @可是运行时提示no such plot: "Totals"+ @! e% S- r$ ]( e- }3 _! Z
error while observer running SET-CURRENT-PLOT$ h1 @4 ~& {/ q u. S7 r
called by procedure DO-PLOTS, P: f' i, ]5 \+ c' l
called by procedure SETUP; d/ V6 m7 i' r D
called by 按钮 'setup'& b/ N& T! E2 y0 O8 f
求大神解答啊 |