我编的程序如下turtles-own [energy]# [) a: z8 O( n) q/ R
to setup
8 c1 C' z/ _/ ~7 b clear-all+ h9 F/ a# F$ t$ M& S% f
setup-patches
$ J- B4 b/ Q- H6 g! e create-turtles 100
+ P! `7 f5 U9 T1 `6 S5 [8 g" n* n do-plots
; O4 R2 D: e; n A, [ ask turtles [ setxy random-xcor random-ycor ]
; F9 }! v7 }5 X& J4 {4 Q) j+ send0 X& H7 A: m7 n7 a+ q( e5 s
to go0 n" Z# m! X3 M- C' ^2 H- v a
move-turtles9 ]7 M3 f' F+ ?$ T6 h4 K
eat-grass
8 X( e+ ^! ~: L. `1 Z& M reproduce
7 T) [2 t2 g+ ~1 R9 T; X8 @( h i check-death1 X- X) ?4 W4 g, A% }4 s. h& T
regrow-grass
/ z) b* d* m7 N! G; f6 C do-plots
% z& M9 q; y5 u' @3 x6 nend2 J0 Z' [5 g- @2 S5 V/ d4 J
to move-turtles% T) A# |, k$ |
ask turtles [5 r7 O: _5 |6 x9 {( D/ f
right random 360" H5 n; U. k( A8 T/ F5 ?# l
forward 1$ F+ q2 r) }6 E7 l' r9 u9 f- ]
set energy energy - 1' S( @! G$ b: n$ g( Q/ F
]
$ ?0 B* Y8 z* ?& g1 Xend
7 ^/ d2 ~. j) W9 Oto setup-patches Z# a6 \# ~3 m: ~
ask patches [ set pcolor green ]% l* K$ W6 m% {: }* J2 N. n p
end% y5 t% Z1 Q+ o7 w
to setup-turtles
, W/ D1 D* x, B create-turtles 100) i* T' g" W7 J1 o/ @2 u1 J
ask turtles [ setxy random-xcor random-ycor ]. A% l- n1 x5 j7 {
end
9 P& @( ]* p3 |to eat-grass
1 _% v& k2 ?; |3 s ask turtles [2 J) T, p9 N( W
if pcolor = green [, ?9 H3 z/ Q1 S: _4 X6 ^
set pcolor black0 T+ ]% U: k7 u
set energy (energy + 10)& g( a* d/ s/ B! S
]
# `/ m% @' N7 y1 i$ r6 U% N; v ifelse show-energy?
/ _; G. w c# O [ set label energy ]
! R* `8 `8 _* D* V6 { [ set label "" ]
# @( W7 ^1 `/ Y8 `$ |. h& D) a ]2 @$ d- i3 J5 P; r# K0 S# @% ^! E% v
end
3 F2 C$ V) Q. ^: V& L' g; {- cto reproduce
; M2 A# A$ [% q, R3 b; M ask turtles [
* d9 m/ h8 k9 Q" Y2 N. N if energy > 50 [
) j; {! Y% J% Z set energy energy - 50
2 k" K3 n& n6 R, r3 C$ j) ~ hatch 1 [ set energy 50 ]
, Z% N4 x5 `$ F: E% T ]
. ]# B6 L) Y0 g! N1 o o3 H4 z' o ], x7 g4 [$ K; B1 {& y' T
end
* M8 L" U7 s: \" I4 N) G) i, [to check-death3 x2 j7 n( \9 B/ w$ F+ R
ask turtles [+ S, \$ C1 W9 N0 _: Q1 R3 H
if energy <= 0 [ die ]
& K2 c, ?$ H* T, P% } ] F' b$ H" f( n! S, S
end
. d8 N4 j7 b8 S# n8 u2 R4 Ato regrow-grass; f' u+ P7 Y9 M! H
ask patches [! s# J( h; X6 ~ V/ P: a
if random 100 < 3 [ set pcolor green ]. w$ \8 |$ c0 A
]* f( `, b/ O; s2 v$ P' {1 f; n2 {
end
& U' J; g: k; uto do-plots; C# r4 m6 @$ z) ^) @+ W h) k
set-current-plot "Totals"
5 C% _& s% Z& ]' [: f9 k v5 X set-current-plot-pen "turtles") f+ e/ A' s7 `4 }4 P
plot count turtles- l2 a4 M) o2 Y' c0 ]! h) t/ Z0 f
set-current-plot-pen "grass"& q. i$ ^8 U* a5 o6 B" W
plot count patches with [pcolor = green]
) ~* i; V0 x8 B$ q7 _end
& ], X }" c0 B+ f: R. A3 c) U可是运行时提示no such plot: "Totals"( O9 J- O! ^4 i4 C1 W: O$ z) A
error while observer running SET-CURRENT-PLOT) v( x& h7 O3 m% X% h
called by procedure DO-PLOTS- f' C9 F8 x: U P$ m' u
called by procedure SETUP
9 X4 d5 d3 v9 K/ b2 k0 V called by 按钮 'setup'2 a4 B& e8 Q+ f" v# _+ W
求大神解答啊 |