我编的程序如下turtles-own [energy]
9 Q+ i+ q+ f# P, r/ ^/ z4 Hto setup
- M- _6 i, s9 E2 S; E clear-all
6 Q' k1 a2 R( h9 v setup-patches% B) A7 Q: C+ ?: f2 v. V& S& ?
create-turtles 100
4 W( M; i/ A' | X% z9 }& G: w do-plots
8 S6 |6 x; x7 R# q ask turtles [ setxy random-xcor random-ycor ]
* `: h. l8 f; }& aend+ g! A' |; f$ z8 C
to go
9 b0 R9 }3 ~/ R9 o$ A! l8 c8 c+ g move-turtles; ], k2 a/ K) ~ Q" e
eat-grass
7 R9 d8 x, ]0 M0 x7 ~& h1 w! D reproduce2 s2 i: S8 U' s! O( `1 o6 X
check-death# q0 G+ l0 p8 X" b* P) E9 ^
regrow-grass# L* u5 m( N$ m6 X" w
do-plots
; z) I$ T# I8 Iend
W( A* ^- n: x4 a! m+ x" X- v. lto move-turtles: Y( H6 N6 F9 c& y# s" B5 V
ask turtles [7 C8 t1 P1 ^$ c+ z; A9 w' P. l0 B8 T
right random 360
# b. s3 _" I# H- c6 l" Y forward 1
+ k: O8 b0 S, x2 D2 O6 e set energy energy - 1
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end/ w- f- x) C/ ?4 ?$ O
to setup-patches
! S4 b. ~+ X% ?+ D ask patches [ set pcolor green ]; P1 _/ X2 q7 p, b& u) Q! J; t' O& F% ~
end
; X6 n) C) @, E7 `: hto setup-turtles
% z" Z; o6 W6 y5 f create-turtles 100
( y2 Q* |8 S. h/ h$ ?3 Z ask turtles [ setxy random-xcor random-ycor ]1 ~, ]8 _( I) s" Z( [& U% Y
end/ s! Y5 k G0 M9 E: g5 ?8 N
to eat-grass
9 A% F" G% q; D2 r ask turtles [
) p, r, m* f4 z; Q! h% x if pcolor = green [
w8 D' l0 H8 {7 T" M, Q7 Y set pcolor black
8 z5 S2 @5 x/ G) x: ]( A# I set energy (energy + 10)9 c# V* t, o+ D( V. H' X
]6 C. c, E/ M2 T0 u& F" U
ifelse show-energy?
9 R* G9 d; C3 j; g( ^* F4 m [ set label energy ]
/ S( V7 N5 ?* n9 P1 C5 i& g [ set label "" ]% K p( e& B: d0 I
]( [( q# C/ M* m0 T( D
end1 U4 N; b- }9 v1 v; U5 \, K6 Z
to reproduce+ T3 i) W6 ~% S" j6 `; F( B
ask turtles [! S, D$ P) n1 ~: r+ R, n
if energy > 50 [
: g3 \# [% ~9 Q7 `2 C1 f set energy energy - 50
" y# W3 S9 [0 ~2 L X, E" | hatch 1 [ set energy 50 ]
3 X4 v5 b9 _' t. ]. g ]
- E8 y, \8 ]/ r ]
, ~ u0 Q$ e7 S6 v* r! g, t3 C: Fend6 z- r8 |5 G9 K9 f5 R i
to check-death) V) J, F8 y H( E
ask turtles [
+ x) S" _0 b0 i if energy <= 0 [ die ]( r# m7 E4 r' k0 r# Y$ x, Q
]4 k0 ^: J0 `" f, o! g" `: b% q
end1 r: o* s% X- V4 \
to regrow-grass
1 ~1 U0 _4 j" G2 E ask patches [
) q7 [: ~* ^) ?" c' k6 O if random 100 < 3 [ set pcolor green ]0 i- I* z+ B; C& k# ?. s
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end
% V7 _. O# D. Cto do-plots
: D! ^/ b7 |+ X- `9 a: U9 C set-current-plot "Totals": W% H5 w9 y( ^$ [: p
set-current-plot-pen "turtles"- H. c) p' m' B0 r' j
plot count turtles
$ N1 z& E+ @! O' | set-current-plot-pen "grass"4 ^1 b# t4 ~# p: A
plot count patches with [pcolor = green]
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: g; M5 O* j9 ^4 u" @可是运行时提示no such plot: "Totals"# g/ c. z: Y8 R7 K4 F7 W3 l+ l' w
error while observer running SET-CURRENT-PLOT
/ a! w5 U8 W- n9 ` called by procedure DO-PLOTS! z; h! L4 P8 b* A; ?- R
called by procedure SETUP8 } n1 Y3 L- W7 Y& `: F# I% F$ Q
called by 按钮 'setup'6 C7 C$ s8 n+ N7 O' G
求大神解答啊 |