我编的程序如下turtles-own [energy], N8 [; l' p" F, w9 y3 c# U
to setup
- E: X9 n ]3 P8 s$ I* [* j clear-all
/ Q/ b4 {+ t. t setup-patches
5 b o4 F7 Y- Z% p create-turtles 100# O+ \" }" G. P. o2 {" o
do-plots" q9 ?! M9 H6 }- o
ask turtles [ setxy random-xcor random-ycor ]
- y, S2 l! J4 jend$ x" P6 _, T! ?$ X" N
to go8 ]3 T! h1 @- I, T
move-turtles
% @9 f5 m ?8 [% m; x eat-grass
+ i# n# J) C: Y3 { O! Z reproduce
; n: z9 ^; S8 `( ^6 q( s! g, N check-death$ O, _- U, x7 P; X3 v
regrow-grass
7 u8 V( T! w& Y- m9 q/ v4 q1 t do-plots# q7 h1 m% Y# f: B; a6 j$ l
end( Z" a3 v* V/ x4 E
to move-turtles Q. |* d, z$ l2 c C$ u
ask turtles [- h% @, k4 Y( ^' G* n
right random 360# P1 U1 U8 w8 z( }8 ^+ N9 D
forward 15 w0 b# b/ h9 Q+ g+ C1 Z) i- ]
set energy energy - 1
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end
* x; Q" [- r. t! a4 X) b6 Gto setup-patches: \6 @) U% ]: T/ p* I8 h5 Z
ask patches [ set pcolor green ]
7 F$ c+ n5 n$ V% G4 Nend
+ c2 y y ~* Gto setup-turtles
" C3 y5 A3 x3 Z, K: U create-turtles 100
6 F5 R, I. b% X( G2 x/ W" y7 |8 W ask turtles [ setxy random-xcor random-ycor ]
8 o, c9 d' ?! h5 s' g9 r8 Rend
# P( a& v7 ]' oto eat-grass) R: E, T9 W* Y$ F; D: D
ask turtles [
& E. s- x2 E: e if pcolor = green [' k) a/ W" @6 }2 _( `* F
set pcolor black- K) f& e4 f- {- p6 L( U
set energy (energy + 10)
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: O3 f6 I- z3 e. z3 W( S& Z! ~( x ifelse show-energy?
, |. A; D& z$ G% p' `1 |/ V9 @ [ set label energy ]
2 Z& o" d* E5 }6 x5 | [ set label "" ]1 p, Q' S0 l; t9 b# Q
]
1 o5 C% b+ C* |end3 K7 j0 [8 L6 D L5 ~8 Y
to reproduce
: K$ y+ ], \+ D6 t% ~ ask turtles [2 e6 E2 H7 k+ u/ K& @
if energy > 50 [
/ Y) V+ I) U+ A set energy energy - 50
/ R/ N8 ~6 Y8 | |) Y6 V hatch 1 [ set energy 50 ]- `9 [8 w/ q5 n6 B" `
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end9 o+ C$ Q& P' W8 q: Q
to check-death; }- C! D( R) z- E7 w) D
ask turtles [: ^3 g1 L$ \* |: K, D# @- B4 F+ |, V
if energy <= 0 [ die ]- i2 c2 n5 `1 @) s$ [/ B
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end( f4 j5 b' g. o I9 @. }
to regrow-grass
' \* L1 c: p2 T1 K ask patches [1 r" F. U4 @, C% s' G% d
if random 100 < 3 [ set pcolor green ]
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end
; q1 ? \& D1 R* jto do-plots
" V/ ~; Y8 |' e( I; D7 J8 M' c2 M set-current-plot "Totals"
4 G7 ~2 |8 J: k y8 ` set-current-plot-pen "turtles"
4 h0 A) E8 j' R# a2 e plot count turtles+ J; E" i3 P9 ^$ a
set-current-plot-pen "grass") J9 M' a4 { m- E* L) m- ?1 A d5 z$ d
plot count patches with [pcolor = green]
3 C i, r. M6 R5 @end
. e8 p, _* p$ B8 u( k6 ~/ F$ J可是运行时提示no such plot: "Totals"
( h. U+ B ~# y5 aerror while observer running SET-CURRENT-PLOT
% K) H) V- h4 L/ {& x) U- y called by procedure DO-PLOTS
, j, g) a, r% J. V2 c called by procedure SETUP: A% R2 {4 s3 _5 a# n; s" b9 B
called by 按钮 'setup'
$ R) `, F7 m& m7 c+ D3 {2 h, e求大神解答啊 |