我编的程序如下turtles-own [energy]$ [/ X/ a# @+ X8 g$ ]4 m4 l" X+ c$ ^* B
to setup
8 v* _) ?0 q7 a) X6 D( l" I9 b9 l clear-all
8 g- G$ a# s: ^* S |+ L# C setup-patches
' l k# ^$ {& V9 s- c6 C9 O! ? create-turtles 100
4 u# R1 {& d- p& { H do-plots0 K/ G0 f! G$ v% f) V$ ^9 k8 W
ask turtles [ setxy random-xcor random-ycor ]4 A0 o/ q3 s8 K+ H+ K" I) }/ d; U
end- }* m4 E( s8 n! \: H
to go
% Y; ^' M( z$ j/ {: f3 i; o move-turtles
. u( Y8 c' x: e eat-grass
! I$ c. y- V: Z+ R0 ?0 F7 h* s reproduce9 T6 K: W/ |; q1 d }# k, |
check-death
& G0 ^3 I; f8 z% s regrow-grass% R' H6 m5 ]. r. ^' P& n
do-plots
+ }5 h3 s) s$ u j0 z# m. w+ ^& oend
5 }& K0 Z! ^* c* ~* jto move-turtles
7 m, U' B& E/ {% r ask turtles [* _' i" G" ?+ I; ^/ Q2 ? q
right random 360
$ T/ Y# s9 E( c( Y6 ]; G forward 1
" {- y0 L! ~: z set energy energy - 1, H* ?+ \2 M5 x' [( E7 H8 E' ~ J
]
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to setup-patches1 |9 e+ G, H* ]: Q
ask patches [ set pcolor green ]( ?2 k2 X8 }; y3 P
end
0 [4 [8 v; I2 C9 p8 [to setup-turtles6 _8 G) m3 n2 ]& m( _
create-turtles 100& ~/ |+ v( Z8 g0 g) D
ask turtles [ setxy random-xcor random-ycor ]
5 ^6 ^, v9 b0 W5 _end! T6 j3 Q+ Z! _0 \" {7 D
to eat-grass% y: }: v" q3 m8 m8 b
ask turtles [. Q0 T8 T2 F* P$ ~: G
if pcolor = green [, l0 F7 F1 v* [1 T" E! P/ K
set pcolor black
0 A& F* a6 [% e2 Y, o- ?" ] set energy (energy + 10)
$ e: s- Q- G1 ? ]
" p# ]! w0 p P' H ifelse show-energy?
+ q* Y7 H( D4 ~# h+ `" u5 r1 I) O3 N [ set label energy ]* K5 u7 {* O, I
[ set label "" ]
3 \0 s8 \' j; p3 h3 H9 | ]! b" J: D5 O5 d7 P0 n( X
end8 ?! [! z) W% M: t% M, k. Z% I+ Z
to reproduce
" G& a2 i* {: q; N; s ask turtles [
C) ^' v9 r0 M: t if energy > 50 [4 n$ ?9 f; _" t' m \- L# d
set energy energy - 50
6 R) P+ _$ |+ ?8 V& \ hatch 1 [ set energy 50 ]' N! Q; F D5 U
]: @( G8 I. _4 @6 `
]- I2 Y8 g- z& l* E+ F
end2 m# P d. q. V" D$ w
to check-death
% K# [+ m% M4 b- C7 q ask turtles [; }: g' t; E9 i8 J0 m
if energy <= 0 [ die ]
; Z3 `5 |$ r5 T$ P ]" h O4 G; b4 E) v+ P4 _; E- v1 g
end
2 r, A6 M6 O0 e/ w- w9 oto regrow-grass- A8 ~' z7 L0 r0 u$ I* |7 G' \
ask patches [( x. ]5 n! `- U$ E/ r" ?3 E" u, E! W
if random 100 < 3 [ set pcolor green ]
0 M& n9 M* u# l6 |# s5 z$ j ]
# l) X1 Z: z& I9 \! P' D7 ?end8 r5 f8 s P/ ?* @
to do-plots
$ [% z. o* Q4 {9 z# {, K6 ] set-current-plot "Totals"
2 Q; @! |: F# N1 P2 p set-current-plot-pen "turtles"
6 E" d2 m4 y& u+ q; }2 f9 m plot count turtles( H1 ?2 b9 t; E1 p, T0 _+ J0 ~
set-current-plot-pen "grass"" ?, T; u4 s8 T5 R0 i& Y" p
plot count patches with [pcolor = green]
$ ~& {$ Q* l0 j4 `! d" Kend) p+ [0 e* a$ H* G, `% F6 o1 _& m
可是运行时提示no such plot: "Totals"4 U/ j' v( K# C) x' q# v1 r
error while observer running SET-CURRENT-PLOT
6 {) D2 [4 \5 O/ H: o: s called by procedure DO-PLOTS
6 _: c* G. O6 H H3 b5 W called by procedure SETUP, Y# a) f) C$ i9 V e; J4 G/ i. |- D
called by 按钮 'setup'6 N' ?+ S( ]2 [+ l( ~; D
求大神解答啊 |