我编的程序如下turtles-own [energy]/ _% p, X1 ?5 L
to setup
( H, X) i& B9 v4 g0 P: z clear-all- u, |2 o# t* j9 P$ [! a
setup-patches
! X$ \( u! u2 Y& } create-turtles 100
$ }5 t# m0 H( q do-plots& \% }+ U" K+ M$ ?
ask turtles [ setxy random-xcor random-ycor ]
4 |; I; w: |5 ]* w, Kend& @ ^; R8 L5 d! b/ V; K
to go) ]1 S. {& A# m1 Y8 x
move-turtles
' |3 E7 H; n6 }, V( f4 W& ^# W eat-grass7 ?2 I- Z3 U' m1 h6 x! L: i, @
reproduce8 S/ D+ Z! E) J2 R* ~
check-death
4 s0 }' t* t' q5 {! X1 M regrow-grass4 @5 r: o+ l: A) \- Z+ t
do-plots
6 Z/ z0 O6 k' m1 K; D& \7 _end
`& U" I# n- ?) sto move-turtles
% h5 \: S5 e% w" E ask turtles [
* J Q) f% L5 u3 p; f1 ^ right random 3604 q3 Z5 B. v. _
forward 16 r5 n4 P' t% f4 e% ]* }
set energy energy - 1
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& J0 z9 ] C! P3 b5 Oend
( H! f) [4 y6 S) m, Cto setup-patches
% i% x* q# J: ^% Z6 \: p ask patches [ set pcolor green ], k0 x' y; E: D9 p# Q
end
, T9 @1 m, D6 [* \to setup-turtles
- S0 X( E4 o) v( v% c, W create-turtles 100: q4 s) C2 t; F4 ^+ G% x# K
ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass. c: H, D; p8 r8 ~! n; N* H
ask turtles [6 M2 [8 H C! ?* _5 E2 ~4 P) }: O7 s
if pcolor = green [; X8 n# L. t) d/ L0 Q0 L
set pcolor black% C/ s. \) P' N$ [5 `" g
set energy (energy + 10)
& Z3 K9 ~6 [$ a& N k$ ? ]% f& t2 E' @$ m0 Z3 Y; G( o/ w
ifelse show-energy?' T& p& x# w$ S# D' q# ?
[ set label energy ], z* E( K6 W% ~6 F4 p* p
[ set label "" ]: y( }9 a6 T7 C- S6 f C8 O
]& n. b6 _0 b# A) ^7 M! m7 V
end
: V; j; B. M& A I$ w; `! Gto reproduce) F, b& n! a. d/ a
ask turtles [
: B" g- Q, [, u' r: o) A/ u if energy > 50 [
% P, X* u4 r' w$ a: g set energy energy - 50
4 J! A: K5 l/ f- L1 I, E7 Z9 |; N" c+ P hatch 1 [ set energy 50 ]" k' O0 b9 f, k5 D6 m2 ]- G) A0 m
]
: g$ |, E) V/ T5 [: O0 p ]
7 `- }# E9 l' C3 e! G) m) _& {end
' H) d. }6 \ f; `: l6 |to check-death
3 w* Y9 @" O. q% q- B" w% n; k ask turtles [ T% R r1 Y, I0 q% ?" ?
if energy <= 0 [ die ]
6 v9 \! R- v. M% w( X ]
* F" W/ v- a8 H2 K+ a( t0 c; Bend
, l5 ^, h% I& M- u6 Q7 G1 Eto regrow-grass
+ O: a1 h& m8 f* [* o ask patches [
6 d$ E a* c$ ?' m: X& @" Y; y4 l if random 100 < 3 [ set pcolor green ]+ u% u8 ^% F! F3 D% P+ E0 y0 ~
]
2 q: U! i v5 B% vend
( G& G) l0 o6 }( U$ T2 c6 Y3 Z2 Nto do-plots! H7 b0 Z3 t5 \' `9 @
set-current-plot "Totals"
: n+ n; _6 U* l& V set-current-plot-pen "turtles"3 m* ?1 q+ }( G! U# e
plot count turtles! G5 j4 h$ X4 b" q2 g+ `, T( s$ x) L
set-current-plot-pen "grass"
* S% @8 P7 s( a2 _2 c6 c plot count patches with [pcolor = green]
# t* D* V+ z, Z( _8 |" F3 @end
0 f7 Y j3 e! j6 @0 C9 I. T% b+ J! `0 z可是运行时提示no such plot: "Totals"
$ @+ N9 L8 t* X- Z0 x6 L* ]+ Z& F: Merror while observer running SET-CURRENT-PLOT1 @9 G+ m" P% f% O: A6 k
called by procedure DO-PLOTS: n7 {( r6 E, [; \/ T# e& J* K( G
called by procedure SETUP: ?9 }7 V* C$ ^5 a* |# q
called by 按钮 'setup', e3 s' v G6 b9 _9 b) W9 x
求大神解答啊 |