我编的程序如下turtles-own [energy]; _9 r' f& ^7 s( m
to setup
4 W( t" C' C/ C ?2 x) o" q, P/ A2 ^, D6 k clear-all
2 C- R# a2 o/ t: A2 m" Z+ z setup-patches5 E& P" h4 _0 \
create-turtles 1004 O) [ S1 i: I4 V9 X
do-plots2 ]5 D. x' f3 z3 m7 w
ask turtles [ setxy random-xcor random-ycor ] {7 p9 P/ i7 e! D; g
end
6 X4 u* D# A# E: eto go; x* h# v( M" P
move-turtles
+ [9 u0 I& q5 {) [ eat-grass. C9 l3 n+ f$ }$ b
reproduce: `1 W* [6 O$ M! O# Q, k6 s
check-death- a* D3 p7 S+ [2 `( |% q1 e
regrow-grass$ K7 \ u# m4 C, A! |
do-plots
0 d$ A) B# Q( H8 ~) fend
% ?3 w$ ]+ R1 X) F( m" D" \to move-turtles! f5 k/ X1 i. w* j
ask turtles [
5 R' P! k- [( L. Y8 b right random 360
+ G' q! y5 l8 X* i( O forward 17 \2 R# ]/ W' J8 }
set energy energy - 1
% D; ]- d# Q! y; J ]/ d+ @" X& K' U/ }7 T' y
end d4 n! ~# x% w/ C; Z1 L- s
to setup-patches
1 z. X4 k: j/ i; v( R ask patches [ set pcolor green ]
- I9 }2 x+ D7 v! Yend# m9 p' G" l/ L
to setup-turtles# E8 ~3 }$ W# ^+ d
create-turtles 100
% S6 x' g L$ j9 E; l. S6 w ask turtles [ setxy random-xcor random-ycor ]
7 l. y1 f: ^6 H( d3 W5 X. l( Vend2 \# n& h) f' i$ z
to eat-grass
! O/ A' j0 }0 n/ }; ?# X ask turtles [; o4 y, b/ U% f
if pcolor = green [- l( o9 _/ a5 M+ {. B; w
set pcolor black& t7 e" u/ `! k/ t
set energy (energy + 10)6 f c( o3 U7 z, n1 a
]
" `; E. {* ?" C, M5 z! V ifelse show-energy?
Y' }9 b$ M# F9 W; S [ set label energy ]0 H/ D3 G* f- {: P9 G; e
[ set label "" ], y6 B5 k4 d8 z# @4 R$ z
]
. k N3 l) l b2 D3 P1 t4 Y: @& uend4 O$ p5 _7 ~3 W
to reproduce
" N" D! e* c' Q5 n' j ask turtles [
" g$ L3 T# ^$ H5 v7 _5 ~% w if energy > 50 [
# B5 Z5 Q, G3 B2 n* h% C9 g set energy energy - 50
5 z. d0 F+ L2 h2 [ hatch 1 [ set energy 50 ]% e6 s9 Y6 q9 _# o3 m# |; o* ]
]
/ k5 |! K ^9 c2 {! s6 s) V ]% e& ?8 F% e! m+ D
end
* k( A N6 U+ ?to check-death, i8 `0 \3 \- V7 W
ask turtles [
' }. P) z6 K2 O9 C1 [ if energy <= 0 [ die ]0 h" [0 U# J9 l7 }. I
]
! l8 w; E( ]/ \; ]end$ P; s$ A7 `- R4 V
to regrow-grass
5 Q4 G' I/ m' f) g. l5 k0 \: ]; B0 @2 a ask patches [
' H( _# l. g- a if random 100 < 3 [ set pcolor green ]
& ]$ `4 E6 b% B* g s/ @+ z ]
) N k/ u; P4 \" y* H5 b+ |6 uend
1 M! Y. F- W1 }, Z$ k* Q1 a' dto do-plots8 M) I+ q3 \. L( J1 o
set-current-plot "Totals"
, }* K7 ^' M" I( j u' A( y set-current-plot-pen "turtles"' j9 G3 D) ~5 V9 T4 b. x: E
plot count turtles$ ]5 j# W$ M, X5 V0 r+ ]9 f0 D
set-current-plot-pen "grass"- D' d% {6 T4 [9 a" H
plot count patches with [pcolor = green]6 G% Y s2 T/ T6 }
end
% P4 U1 w V8 j4 q+ [3 k可是运行时提示no such plot: "Totals"7 F# Z0 t/ l/ q
error while observer running SET-CURRENT-PLOT9 \+ Z; n; |/ i) i) `3 `4 ]# b; Y; I
called by procedure DO-PLOTS
9 B5 [ F, j- p3 k called by procedure SETUP. n8 \( j! r* M7 t
called by 按钮 'setup'9 h- r4 k6 c$ }) u# |
求大神解答啊 |