我编的程序如下turtles-own [energy]- p% w; n4 G0 E
to setup
5 d/ W$ ?; M# Y" b+ O clear-all
2 g6 U) h( A( l/ P% y- ^+ u setup-patches
/ B& ~4 D9 L2 ? create-turtles 100
4 u0 i n. N% B6 n" X% Y$ C( y do-plots
! q% L% u$ e7 X# {. J0 I% { ask turtles [ setxy random-xcor random-ycor ]1 q- @6 \, S @/ n: u3 v
end3 \3 j" C6 W2 z$ |2 ^& I
to go2 C. S. X( F7 e( I2 \; C
move-turtles B4 ]2 ~* f/ M, D f
eat-grass8 j5 X; B+ C( n4 H! m% ~
reproduce: K) l+ w1 K0 A* X, A7 U7 |/ d8 P
check-death
) }/ e6 P, f# G! Y regrow-grass( ?$ X, h% f5 g4 V6 h7 v
do-plots7 b$ `, Q+ K: w; g. g$ s- R
end
. b/ c. y! Q+ P4 M. w0 ?to move-turtles
4 n8 K3 u8 A3 Y! N/ F# g* k ask turtles [
: p( ^/ \3 p' z; G7 x- H3 ~" \ right random 360! c6 W& C$ L( w
forward 1' E* @: I: y/ A, u, c6 N9 m3 ]$ |
set energy energy - 1
. f( q: ~. u" e: r% F2 [ ]
; h4 Q0 g C" F2 k3 f" dend2 V* b: V) ~3 z" z4 f! R2 E& _
to setup-patches, d' {8 B2 N8 y. t& o- H
ask patches [ set pcolor green ]
& T, n9 u' ]% bend
$ Y6 w1 x' ?# {" i0 T% d% ^5 J! Sto setup-turtles
2 C. \! l @5 T# j create-turtles 100
! i" C1 G3 u2 Q' d3 r2 |- j0 M ask turtles [ setxy random-xcor random-ycor ]
e: B3 |- o! \end
2 a ]- Z. R- ~2 Y) D, Jto eat-grass
- N2 ]& L# U! v- Z/ r H3 u4 ?# f ask turtles [
/ n8 s9 } ?9 L/ v8 K if pcolor = green [
- n9 L/ A/ t5 K/ x, q/ t9 J set pcolor black( N) `0 q/ M# W1 N
set energy (energy + 10)
4 b* x6 J, d4 g( Z+ X8 G8 ^( @ ]* v9 }# @! |3 J2 T2 z7 j# G
ifelse show-energy?& N2 E3 ]! J2 d: `' L# M6 d, x) i
[ set label energy ]
+ |6 g& d( D6 }- \* k; L [ set label "" ]& n$ @! O( F6 [. Q) U2 |
]9 f% t# z1 C8 G* A' L, H
end/ F2 W, B# Q, j+ s' U, X# C7 z. w( _
to reproduce
% d ~! k+ _; d, t ask turtles [
" v# U d9 S0 ^4 ~2 z. j if energy > 50 [
; ]- _0 B, P; A f* G- ^# v set energy energy - 50$ t; H8 f- {# _ L" S5 F
hatch 1 [ set energy 50 ]
+ u# u( b" w9 z ]- b5 E* R/ ]; \4 |: p& g
]
2 H5 ?( V6 S1 j5 u% j: jend
& S/ ^# G0 K2 D4 uto check-death
% V- p5 I0 F5 j ask turtles [9 ]1 C; h+ O; ~- C
if energy <= 0 [ die ], G) i/ A3 I$ {# }$ m) m
]- m E- X+ X$ g0 w& X/ B
end
2 @5 Q4 j* L# J6 ~ g5 j9 Mto regrow-grass/ J+ ~, q! M `( g8 _* l* g
ask patches [' {' `3 x$ j. c- S T
if random 100 < 3 [ set pcolor green ]
4 y7 B7 K9 f: q! |" p: Y ]
' I: W# n% I6 o( W( J# ^8 gend
& A: b$ l. h& i# Qto do-plots5 U- v8 d5 l9 w8 W% m4 O
set-current-plot "Totals"
6 o, U2 \# t0 I3 V) Z set-current-plot-pen "turtles"
- t" e, Q$ ?5 D% F) k plot count turtles" ~& f3 k8 T0 ]+ q2 n2 I
set-current-plot-pen "grass"2 S: r% |( i3 b+ ?% L. l: V
plot count patches with [pcolor = green]
/ {( R# |' ?- u2 [$ E: Mend
# w" U- p( R6 O& j可是运行时提示no such plot: "Totals"- O% I$ z- f1 j' R; l
error while observer running SET-CURRENT-PLOT
" c6 ~9 a- L8 u6 L4 G% G9 Y called by procedure DO-PLOTS
" `0 g; t4 s. i& S, t called by procedure SETUP
7 Z l" q: S8 U+ D called by 按钮 'setup'- D2 E W' K) r/ t( y3 A; I# g. v
求大神解答啊 |