我编的程序如下turtles-own [energy]2 s; [5 K( E8 X1 Y
to setup
/ i+ V( Z( R$ V9 y0 O& ]. B; Y clear-all( f% f% v# m- w; z
setup-patches
( C4 O2 ^# s4 n; v, f create-turtles 100
. w. ]. D! Z9 a4 b" W) E! o do-plots; u0 _) _5 g, [+ H4 o
ask turtles [ setxy random-xcor random-ycor ]
5 q" |( v( \) ~end1 B& i! F& z, O+ p
to go6 w* K2 X0 p! v9 n. Q
move-turtles, Z8 W& `1 o o$ w3 A
eat-grass
* ^" k6 G) J7 }9 p) d( f reproduce" c* }$ m; Y- I
check-death$ g% @0 g5 ?9 J5 G% w$ @% ]
regrow-grass9 B, S1 k! J* _0 N+ u. X
do-plots' y4 G; v' d+ S/ i6 y; v2 x
end" t9 E' F2 [/ f0 Z/ F1 m; o
to move-turtles
3 F, H4 S$ Y$ h8 p6 l) V5 I ask turtles [3 h+ @( v5 C) Z, M6 M3 v
right random 3606 R/ S1 x8 i- A' m8 r- h. _
forward 1 |4 ] j% M+ o7 o
set energy energy - 1; \0 H" G% y: j4 ~1 }) w
]/ D$ V4 L* U; h8 m$ I, S
end
9 @+ q& p4 Z: Qto setup-patches
- x( P. A: P7 x1 j8 Y9 ` ask patches [ set pcolor green ]7 N8 o1 V3 x" P7 X1 u5 s5 ]9 `
end
$ N* w( W7 Y: s7 \- n- U0 Y* ]8 hto setup-turtles9 a7 Q. x# v) ^7 g$ {" [
create-turtles 1002 x ?% P' H9 a) p& s
ask turtles [ setxy random-xcor random-ycor ]# u+ H$ [8 \! E5 O9 y
end
) Y( a4 W% q& I; p% X# b: @$ gto eat-grass
1 H2 F1 V* M$ |# \ ask turtles [/ O; ]: C+ ~ D' S9 I
if pcolor = green [
6 b: R0 Q2 b9 t0 c& H/ x set pcolor black
& }5 q1 i# w1 {; O, r set energy (energy + 10)
: s% [7 e! K) Z9 J4 H ]
8 T6 p! g* q1 l `2 ^& K, @/ P ifelse show-energy?
% `0 U% s: C: ~# j [ set label energy ]7 {8 x9 h0 K6 y% ~5 v
[ set label "" ]6 E* e( B) d( \9 S- n) q& n0 |
]
7 j' c( `, s$ }4 Uend4 j2 W5 Q; }: V3 i# W
to reproduce
% d+ j0 l" o* x1 N5 z0 B7 l ask turtles [# H9 t& O! e5 Z
if energy > 50 [% ?5 t! `% i7 }$ M; _; E
set energy energy - 50
% T# _3 |" W" {0 |& M# p hatch 1 [ set energy 50 ]
9 y+ Q. E; C) x0 { ]3 k- z* }9 e# m( w
]
9 g: U u. z$ b6 wend! i. Q, n- [0 d0 ^
to check-death/ g0 J; Z5 ?* B w) u
ask turtles [
8 n1 O/ E8 t8 ^3 b4 k' r if energy <= 0 [ die ]
$ c& G. J4 I- b8 _( f" F4 N ]" h9 s/ k( l/ M/ w4 f; M+ I
end+ V9 L) Y6 B2 a2 i& j& s
to regrow-grass
; x6 M6 l2 C* H/ W ask patches [
) Q* X1 Q) ^2 M/ W6 s) g" p if random 100 < 3 [ set pcolor green ]4 N# ~" E! P5 v% |, i! `
]
4 v9 ~9 h& p" r% A& zend3 Q i, t6 V+ v( ]% o
to do-plots0 |- @: B+ Y) ^" X
set-current-plot "Totals"
8 o% [8 T4 k* C, i0 ~3 r8 H) q set-current-plot-pen "turtles"
, y7 [' c% |7 q& t plot count turtles7 v3 B5 s8 I# F5 u9 V$ B: m; a! O3 c* h
set-current-plot-pen "grass"
8 D/ J& G5 [4 ^7 ~* n+ F7 u4 L plot count patches with [pcolor = green]5 z1 z" p( i* \- Z/ X
end) g1 [ [# u5 a/ G- i* ?, W
可是运行时提示no such plot: "Totals"
) R5 Q c2 m5 J6 U8 e/ V4 t( aerror while observer running SET-CURRENT-PLOT+ v( e5 d! g4 C3 n8 I4 ^
called by procedure DO-PLOTS
2 l+ V- x' L( p; v$ ] called by procedure SETUP
' J0 M' r. A/ a' ]1 d called by 按钮 'setup'2 v1 V0 v. u- X+ T6 Q" C7 ~% T3 c9 \% H
求大神解答啊 |