我编的程序如下turtles-own [energy], K% [6 E- j! F0 q+ Z( h1 P
to setup
0 F W Q0 s( W clear-all
$ a* J% O& e+ \! b1 Z D2 E setup-patches( m/ ^) r7 |7 Q
create-turtles 100
}- Q) e0 f } do-plots2 ~# c0 h( _' Y5 |" V
ask turtles [ setxy random-xcor random-ycor ]( d2 G/ Q/ i6 C# s3 S3 g
end6 l: T' j7 [! }9 f
to go
5 u% L" @( n% K! ~ move-turtles
# x/ e- m$ _: W9 Z% r. P& x' h eat-grass; b- P' F, t6 a' m! T& R$ O$ m
reproduce
4 n& g6 {" k* U$ H check-death u$ e$ F. F. L! y) a3 }
regrow-grass* _+ j' l' G1 v! V, p# O8 g
do-plots, y; j+ j+ A3 N/ N V/ h$ i
end
6 r+ f7 ^- f3 A* n t( Yto move-turtles2 B$ n. O1 r4 O, b( p- M6 J
ask turtles [# L- d, K/ V+ ~% k3 N3 C: e) n. [3 a- f( J1 N
right random 360
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set energy energy - 1
1 i8 B/ D/ Q0 ~4 Q! w5 \ ]
0 G" ?. R! `( ?% [end6 t/ S" {- p3 n& Z1 q
to setup-patches
3 F7 s$ w+ \) Y+ _' v8 [4 _ ask patches [ set pcolor green ]1 r2 l* r$ [4 I
end2 I3 f$ o1 m; F; q: o
to setup-turtles
5 m0 ]- I- D$ c- _3 n9 w( }& j+ [$ x create-turtles 100
: n! g* `% {) V& `$ N1 r1 K/ U8 A ask turtles [ setxy random-xcor random-ycor ]" Q+ Y% [# @6 o; G& R; c
end
; n; d- b! E! {8 F- n9 M' Bto eat-grass
( {) g- L3 l$ A2 G$ B0 | ask turtles [$ f8 R1 @$ V+ I6 r$ M
if pcolor = green [4 _* P# E+ l9 p4 \% j2 y$ P
set pcolor black* L h* Z5 q5 D2 _* a/ D
set energy (energy + 10)
y& V6 a' c* b ]4 k0 x( z Y ]9 g! M9 T, P2 c+ x& Y' T
ifelse show-energy?4 Z( H& T6 [) g6 W' ]5 {
[ set label energy ]
d, o2 h1 b; m! @" x [ set label "" ]$ V, a" I& @6 v
]
: j$ [$ ]8 V% Q4 z! C# E- a" dend, G3 \. g8 W) N, H/ I( B9 p* H
to reproduce( m; h. C/ I6 f$ ~" [
ask turtles [
6 {) ?9 }% K. z& u: q( e if energy > 50 [ d# }' X% s8 V* @9 j# k
set energy energy - 50
8 {( S& r4 U/ H hatch 1 [ set energy 50 ]
/ P3 S+ K( W+ g" B ]
% ]8 \. V7 G$ I4 P6 i ]: N& a+ B1 d4 R, r* U7 r; W
end; f; s5 |1 D* s* \
to check-death( ~8 f: Q. B! t
ask turtles [
9 a0 \7 ^, l6 W! u8 v8 x if energy <= 0 [ die ]8 w3 O8 P3 @, A; x {5 r O
]5 Y5 k6 q: O( I& b. M& j+ U; O8 _' @! T: D
end- [: W0 _; [& c: S+ @. Z
to regrow-grass
h8 \) W+ N# ?6 ^1 u0 X& { ask patches [* v+ n# i9 a% D% ?) W" @% Q, P
if random 100 < 3 [ set pcolor green ]
/ c3 C: w: B# I: o ]) @9 R6 _. {3 u9 ]$ y* ?
end
: B3 D v* W& ? ?: D3 I, ]2 S5 Ito do-plots& V! e# v& w/ w6 D7 f+ c" E
set-current-plot "Totals"
$ J2 q$ ^4 l) ~) s set-current-plot-pen "turtles"
# B: r# t p( @3 ]3 Y plot count turtles
" u' W3 L, J/ H# D, d# ^7 | set-current-plot-pen "grass"
5 O- @% v S+ p, B/ X- a2 M8 A9 [7 z plot count patches with [pcolor = green]
+ A$ j2 L% s( O* F' [- o: l2 Nend
+ f. s' l& Q- M7 E, [ _/ g可是运行时提示no such plot: "Totals"# P, _. Y2 \6 Z% d
error while observer running SET-CURRENT-PLOT
* B6 W& R0 C. K called by procedure DO-PLOTS
' w; _7 v) ^' R0 r4 f: W called by procedure SETUP( D$ R# X2 [5 S
called by 按钮 'setup'7 i4 z9 n% J8 s" j. P
求大神解答啊 |