我编的程序如下turtles-own [energy]( N2 b/ ?5 ]7 }$ w1 O |: W; a
to setup7 _) O% r2 I1 @- b9 P/ h# r
clear-all1 B% F! Y1 {% l/ D" g2 [
setup-patches6 X. Y5 k$ y; e7 T# p
create-turtles 1002 H d+ S: \% M8 C3 K( v5 H
do-plots, C) v# ]# ~* w7 L! I5 U/ F7 l
ask turtles [ setxy random-xcor random-ycor ]3 D, k2 l @) I, Q: K
end
0 m6 O( z4 m8 X d( u4 J* a% Eto go A8 m/ o1 a8 g3 h+ C" L& x
move-turtles+ T# J( g/ T3 ]7 f
eat-grass& {; B( M6 N' w- j# t
reproduce6 f, v3 L9 `4 x, u8 {
check-death
+ @1 P* e7 E8 Q2 ^( X regrow-grass
- q& A! o" H5 E% o5 j& ^# l1 T do-plots
7 @3 H- ?' Y% f& x( P" Xend7 N4 @# E2 H9 ]. |( ]
to move-turtles
) K1 q# `% R- j ask turtles [
+ d) x4 T3 B6 e right random 360
+ D9 \$ s8 F% S! S& L forward 1
7 G: r. G1 z* V" @6 h/ ^0 D+ F+ Z# X set energy energy - 1
( p% ^% N( g9 K5 X2 ?# A ]
k" R- a: B& l( x) S4 z) Qend
+ _1 X5 Q' G2 {to setup-patches
" v& ?( A8 I* B: x7 Y ask patches [ set pcolor green ], R& P! _# y" q* r7 w
end' z, T v2 b, z9 L, U* Y
to setup-turtles
% F( p7 K8 O$ k) j create-turtles 100+ E* r+ @0 H4 W9 H. P) A# {; ? Z
ask turtles [ setxy random-xcor random-ycor ]; e% ~0 r) z% I/ t- p
end9 ~5 U/ E- V/ C* Z; j
to eat-grass
! u! Z- A D! X# K: R- E ask turtles [. J7 u( a5 I+ I; o% O Q( S- x8 j0 r+ T; u
if pcolor = green [
# u5 J7 y. L3 O* m$ g B, A set pcolor black6 \; a, I- v* v1 g- y1 X( b
set energy (energy + 10)% V8 G; e1 r3 Q. Z- E8 r! w
] i1 x" }) r7 U+ z, D
ifelse show-energy?
) l2 Q/ z& g2 a, p9 H8 W [ set label energy ]; X( l ~) E5 [9 p- u" ~: W4 N
[ set label "" ]
6 [( b" K+ @. r' h6 X0 H( g ]6 g# N4 o) [# G' }
end
8 u2 Z# s. [ O2 {to reproduce1 g5 D$ H9 }' K! E
ask turtles [$ U) s3 b e$ H8 k
if energy > 50 [+ ~& v. e. Q6 o6 ^, j4 w
set energy energy - 50- K$ \- h6 d* |5 C' Y
hatch 1 [ set energy 50 ]
" M- ~/ y( \) A, i/ y& L ]! I* n4 J& Z( \6 Y
]6 ]# j! ?3 d, x/ H
end
4 ?# T- d8 u }* N4 Eto check-death
) H7 @( I* D- [1 _5 c8 c0 T ask turtles [
0 z' o# a* j. D) T( C6 {5 t$ S if energy <= 0 [ die ]
# x/ |: y0 @' L8 V% t ]& y. M( v+ X8 A/ ^0 \+ b: O M
end
6 i! U: b' t/ a9 E9 ato regrow-grass8 U* o! B3 Q; d
ask patches [
+ T% Q! C( w5 C. P) j2 c if random 100 < 3 [ set pcolor green ]
& ^3 f% v; l+ g; M4 m6 Q* @ ]
. D( c: N, d5 t! P6 L5 R2 kend7 w# m. a% n$ D7 s' }; u
to do-plots* L9 l* A+ E1 c. }: z
set-current-plot "Totals"
5 p i! g9 U" O/ C r- V set-current-plot-pen "turtles"( |. a' D( T$ `. ^: ^* R0 B7 V
plot count turtles
( G& M, d% |6 J4 q+ ?$ O& Z set-current-plot-pen "grass"
( p1 y( s5 z4 i plot count patches with [pcolor = green]
1 @$ O- D* O/ }" n3 Send# m- S$ _( P* w# u& j
可是运行时提示no such plot: "Totals"
j, r% S0 h9 o( P. e* Gerror while observer running SET-CURRENT-PLOT# G% u3 T$ E8 n4 e6 _7 e
called by procedure DO-PLOTS, p A+ ~8 ]! p
called by procedure SETUP
( E% E0 @8 o6 K called by 按钮 'setup'
0 P$ g" S4 o! R% K9 V. d7 l求大神解答啊 |