我编的程序如下turtles-own [energy]! l8 c1 F+ ~- m: U9 h
to setup
k2 L- {* g8 b. _0 q- x; l z1 f" f clear-all
1 y* v( |# M' ^2 B/ k; R setup-patches
/ U- G2 j$ ^2 `3 N: E create-turtles 100
4 t& K% Z! z2 ^$ y do-plots
* F' I% D7 f D" J: | ask turtles [ setxy random-xcor random-ycor ]" Y S1 q5 p, S- L) Q1 Q
end, F# t9 H6 ]+ A" t1 \8 K
to go7 S" |" [ v) d% }
move-turtles
1 @" e3 H* ~1 _3 ?# L4 h7 o eat-grass
7 H0 U) e6 w$ U9 q; y- o* X" ]5 c reproduce
$ a0 P% ^% Q+ `/ O+ x/ H* Z- z check-death
" ], O: I1 n: L1 w regrow-grass/ k c" Q! {/ {- M/ U4 f' O, h
do-plots
. @$ K- {+ K$ L. j9 Gend6 ]# V3 [; |& W* y0 F# u
to move-turtles; |7 f$ h3 B4 _, L
ask turtles [
* m% L, V a# r2 o! o( P right random 360
; c- L8 F5 K7 F" S$ E) M forward 1) G# h$ Q; j$ O& r' v$ t
set energy energy - 1
a3 N5 y$ J* b( Q& H6 h& [# {* ] ]7 f" {3 w0 K; ~
end
' W# N' p6 y( h- b5 \3 wto setup-patches9 ^8 e1 X$ i$ q% _ n
ask patches [ set pcolor green ]
7 V7 R9 Y7 L1 C9 { [end9 o% L7 u0 B+ a- H3 c( l }
to setup-turtles
8 l: \4 I$ h/ d' V9 n/ e8 U9 w5 j* r* C create-turtles 100
5 ^; [! W' a ^2 E9 _) Q ask turtles [ setxy random-xcor random-ycor ]
a: H c1 p0 k* |' Pend
( o: X$ i3 h" z$ k) v* cto eat-grass* O+ Q) c' ?, C# L( r' \( G* Q
ask turtles [' B( }& l2 B3 y# e i' G- E
if pcolor = green [! {2 c( W4 a. b! f! G: x" N
set pcolor black
' M9 o3 c8 Z7 h3 x% S' g set energy (energy + 10)
W% i. n7 e6 N% L1 O( A4 m/ C ]
" O% o* w8 Q# ~+ G$ |; | ifelse show-energy?
; N1 y9 U/ g6 F [ set label energy ]
8 C- O, r5 `1 b' m. p4 e' |$ r [ set label "" ]! ^' O" D) \# t$ P
]9 e# P7 z1 F% v: c8 ?, n: G
end% b7 W2 d/ i- o# H3 @
to reproduce3 T( ]5 [+ t: g* `% _
ask turtles [
) {. R G" G& D8 \* ^4 o0 Y( N if energy > 50 [
w/ k$ o) s I8 g set energy energy - 50
. t1 x- |9 N8 I: ` hatch 1 [ set energy 50 ]
0 f9 F) g& k6 j9 i/ w$ u- x& }9 ^ ]
8 T$ K: C3 h e0 q A( e ]0 I& ?4 M0 s& e( h" T
end. k; B' T& D) r+ T
to check-death9 d% d$ s3 ~: g, g
ask turtles [
, U& }% h5 k( k0 m7 X if energy <= 0 [ die ]
- ^; ]" b* ] S ]
. }0 e' s0 s2 m$ L1 v% B4 ?end$ i5 |: ~$ i& y9 l5 S- K
to regrow-grass, z7 ~/ B7 r @9 e. g5 R# k
ask patches [2 m% w" [6 T3 c9 S7 O/ t5 z+ r/ [- W
if random 100 < 3 [ set pcolor green ]
* B w r3 o% }' q. O7 x ]. l5 C# F: C% B+ I* O+ f, s6 u
end
2 o9 g# D0 j* o" {( Wto do-plots
7 w6 G, `5 t9 ]. U2 K: f$ b2 i) k- ~ set-current-plot "Totals"
- @8 s$ B, z5 \# J0 q( Q& Q( N5 |3 E set-current-plot-pen "turtles"/ |4 Z' A; i" R h% G1 d& ]
plot count turtles0 x1 O: y% H0 b; j2 r: b/ C
set-current-plot-pen "grass"
# W4 ^7 z* i) M/ C5 p' W9 O+ { plot count patches with [pcolor = green]; k9 ?# i U! j/ K |2 _, z& [4 b
end
: Q1 f0 B5 f: T; W" @! c可是运行时提示no such plot: "Totals". R3 O% D8 J& f: F* x6 i
error while observer running SET-CURRENT-PLOT! K, O+ S* [4 Z, }# H
called by procedure DO-PLOTS
0 y$ D& _2 S8 W. U/ F" [! z called by procedure SETUP Z; o: z! M$ W+ c6 z, M$ p! [$ N$ Y
called by 按钮 'setup'8 I" n% m8 W9 e' S3 U6 a
求大神解答啊 |