我编的程序如下turtles-own [energy], D6 Y" g: B7 s/ a- }6 \! {* Z
to setup
' B5 r$ m( M* b, ?8 u3 Q' e# w3 \ clear-all; y, d& w% P; @( Z, h1 M }
setup-patches
/ P4 }/ A# \0 _ create-turtles 100
; M& @9 i" I. w$ y0 S do-plots* U1 V. o _: t' K: q; u
ask turtles [ setxy random-xcor random-ycor ]
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to go5 g9 R* T. J, K; G, h' \
move-turtles
! y; {5 U. @% h eat-grass
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check-death
0 c. g; Z5 X% M3 a% Z9 T0 x regrow-grass
! }0 m6 i# o2 x" w- D D m do-plots0 M2 N R5 X s. D' U6 m, [
end
1 V y- m8 ^& _8 i& m- Zto move-turtles
2 `2 U9 J- ^6 B! c; F ask turtles [0 K# k$ S: v3 R7 b* i% Q
right random 360
4 c) ^: _$ }5 ^2 R forward 1
2 u5 H. y: e; q set energy energy - 15 D& j' D# T+ n& K1 Z
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end* i# J0 L+ A6 ^
to setup-patches
0 a+ T" v u" N0 I# ~7 u2 t) ] ask patches [ set pcolor green ]( A+ [0 z+ i' B# J9 L; h& C/ V
end) U X! @0 }8 ~6 m
to setup-turtles( y3 _9 j2 p9 [+ \- n! X
create-turtles 100
% ^9 k; J7 m0 p4 A# O6 Q) e1 L" J/ H; ` ask turtles [ setxy random-xcor random-ycor ]7 s: L1 e) }$ \1 ~6 Q$ P5 F
end: r- E; X5 f. X) n. A9 g, q/ Q3 m& ~
to eat-grass! q4 p3 L4 U( K9 B% b
ask turtles [
) m, O) ~1 `" Z, ^9 g if pcolor = green [
! ?# D( e4 \9 r0 d0 c" [1 S; e set pcolor black4 _5 @2 d* m. Y" ^4 k0 b' p
set energy (energy + 10) s7 }" n4 d ?+ q6 ^! [2 A" d
]
9 j* S0 g7 z& Y9 G$ u! ^1 r7 | ifelse show-energy?" W" P; a5 X6 G* @
[ set label energy ]
1 d+ S/ l" `- ^' R8 l M [ set label "" ]
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end* a9 O, @! h4 Q
to reproduce
) B" i% D$ j) s ask turtles [
" ^% x+ q) P# L( E if energy > 50 [
$ _) _) p1 O5 p. |: g; E/ w set energy energy - 50
, J' _1 j* q4 s. E9 \ hatch 1 [ set energy 50 ]1 |6 r4 b4 L8 E4 ` B" p
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end
! J6 c) ?5 t% Q, W! F- H4 g+ s9 hto check-death: _* ~+ C8 n3 J0 j- g" {2 ~' X+ n
ask turtles [
# a; e" Q3 O! @ if energy <= 0 [ die ]
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end/ @) f. R) P! R! f
to regrow-grass5 r& x( a3 G' B; g+ Q
ask patches [2 ?4 ~( k( q" A' p. j. \/ K$ X
if random 100 < 3 [ set pcolor green ]
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end
' s5 D! X1 g5 s/ gto do-plots
8 Y: M# T" r6 T+ Q5 i& f set-current-plot "Totals"3 m4 {6 b/ J6 r3 F9 t0 [* Z
set-current-plot-pen "turtles"" P% E+ z( @; Z N; \* z C
plot count turtles5 W& G' `5 b0 _) `
set-current-plot-pen "grass"# i- d2 A+ W5 Y, w- P; L+ w
plot count patches with [pcolor = green]
; L5 s+ D; F! R2 B" v+ [5 A4 wend
/ b' Z0 v* t7 I1 d" m可是运行时提示no such plot: "Totals"
/ g7 N5 T, o+ o1 s( yerror while observer running SET-CURRENT-PLOT4 U) H. t& e4 i8 _5 j
called by procedure DO-PLOTS% {5 @+ ]8 Y: ~3 i# T, Q- r6 E
called by procedure SETUP6 i; m) L4 e% T4 B @0 @0 W
called by 按钮 'setup'5 P$ S" |6 j; O( Q; S* N
求大神解答啊 |