我编的程序如下turtles-own [energy]; g0 Z0 O* G, ^1 J2 R x
to setup% c; P! h+ w: g. b! o c0 ^
clear-all
: E% r; d1 j! p% \8 I+ W setup-patches
: x& I0 J8 @* D! r% z create-turtles 100
& G6 S! C+ X9 l: n# ]0 O6 Z5 P( e do-plots/ {6 i% |7 g& q+ ]
ask turtles [ setxy random-xcor random-ycor ]
7 D5 I9 Q- E Cend
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move-turtles) |6 d5 D6 o3 g8 A$ A
eat-grass
" I* B u% K( x, m% e7 k( b reproduce! m% M, T) @% a, m! S# {! H% R' Y* _: _
check-death
: D" Y0 ]! _( E- d* l regrow-grass
7 d; C8 n* l9 N7 U do-plots. r7 c; v7 a$ ~3 e5 T, Y
end( g1 V- i% w8 n+ F, A) L5 N
to move-turtles( q. v- _1 x! `% I
ask turtles [' K, r& s9 u$ D) ^7 u, a
right random 360% c9 [- l4 l9 Q9 P
forward 15 s% m5 q/ v4 R" Y
set energy energy - 1! I& r, a3 |8 P; I0 B- }, Q
]
) [, @/ L0 F) T3 iend
; x& V/ s9 a* @! Ato setup-patches% t8 Q! U) r8 b/ j- [8 X; q3 v
ask patches [ set pcolor green ]# `' A5 K% n; j( e* L
end L4 |! u! O% e* W# k
to setup-turtles
9 o3 G6 S( ]$ M# f' K create-turtles 100
; `# N% T1 v- U9 ~ ask turtles [ setxy random-xcor random-ycor ], o- N8 |% n3 U4 F5 \! ]& y
end
F3 e9 i; [+ nto eat-grass1 A: ]7 H! K, `, `7 P# X6 S
ask turtles [
5 t5 f8 n5 ]' }6 d! H! K if pcolor = green [
! o- ~2 M* U; U' I/ c5 R2 S1 P set pcolor black
1 g, C! U5 P$ D6 f8 g& ? set energy (energy + 10)
3 X3 S2 s/ Q' N% n- W1 j: q ]
/ J" r8 X, H! ~2 p+ z ifelse show-energy?3 }! D6 I6 U5 Z7 Z
[ set label energy ]0 v6 s3 D6 R0 M4 ~
[ set label "" ]: M2 A1 ?9 C5 T6 z, a* F
]
& C& i5 ^4 X* W1 T4 Y% Y/ c& X& ?6 H; vend
3 \) L+ y+ a" v7 `" M* L% D8 X( bto reproduce3 u0 l- D5 O2 T1 h1 p
ask turtles [
G7 {4 W" U2 F, r( _ if energy > 50 [7 T, x' B1 k/ \. x, @* m
set energy energy - 50! i! l. E9 i: I% A6 M
hatch 1 [ set energy 50 ]
% i: W) x9 O5 L. ~* \/ U% r+ C* e ]9 r. `9 l% R- w0 x/ J
]3 o. R' ?" D) K7 Z/ |
end
( n* i. y4 ^2 j, w2 wto check-death
3 j$ q B4 a6 b V, C ask turtles [
9 v- k% ~/ U' d# u& [ Z( d if energy <= 0 [ die ]. Q* d8 o0 G/ B( N& d X: f3 {
]
7 G, i/ a' J1 M) S& B# n8 b7 tend2 n) p3 v( U' M6 e @, t
to regrow-grass
" h2 ^2 ~4 d+ _. Q" p ask patches [
5 f5 e# y* `* J8 N/ _ if random 100 < 3 [ set pcolor green ]
* n7 C0 E, w! i2 X ]
" Q( \8 e8 h/ a* V+ C" @7 nend' u9 I" g" Z8 E2 `$ T, v7 o; I6 S' h
to do-plots
7 V# p' g9 F, i8 T) y" i set-current-plot "Totals"8 C, L! Q+ o# T) R
set-current-plot-pen "turtles"
1 A) U9 J3 A2 t! i6 ~; c% g! ` plot count turtles
- j f* P# v0 D4 ?0 _ set-current-plot-pen "grass"
5 w# x. I0 d: _% @$ T/ c o. `+ ^ plot count patches with [pcolor = green]
( }7 P) {6 `% C+ K& A3 k/ Eend0 Z+ X c0 T( t, H
可是运行时提示no such plot: "Totals"7 g) |5 k Y8 x! {+ p
error while observer running SET-CURRENT-PLOT$ ]6 [) w" {) A, q5 i
called by procedure DO-PLOTS
* t. e! d" h3 h; o3 y) ? called by procedure SETUP
2 L4 `4 v2 P# E& a called by 按钮 'setup'
) h+ O) e* ~# @3 j求大神解答啊 |