我编的程序如下turtles-own [energy]& c4 @" l& N* N% H9 }4 u# J+ t" N
to setup
. }" K- D U% W& p. v/ Q0 Q2 r8 J clear-all
8 H# m- z9 w9 s* v; i setup-patches
) ` s: }" [2 c. m/ f8 } create-turtles 1001 m' _% C8 I. N- t( v) Q |2 q
do-plots5 B( ?+ ^0 X# T$ J* x: ]
ask turtles [ setxy random-xcor random-ycor ]
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to go
6 B( v/ ~- x# y0 h o move-turtles; B a1 n5 \8 M' E+ _8 o
eat-grass
1 Q& l. a% s6 j" s' f# \ reproduce- \1 g% _3 W! \" C# o1 u5 m& a' G# X
check-death6 p. o3 g2 S) a' k5 J6 V6 ?: q# p4 a
regrow-grass
: H+ S3 _9 B0 c$ ?- h do-plots' d6 y- y; D7 v
end* E; B/ d0 _+ ?, n" A+ V' S
to move-turtles
. n1 ]/ t/ }0 g9 Z7 H; o7 y ask turtles [4 ?" }% T/ o" p7 T( v; K
right random 360" E% P- n0 B+ t* m/ H# }
forward 1
I) r4 X3 V0 q& w' Z6 c$ B0 F4 O; n set energy energy - 1
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end2 u" D( o' P$ q: `
to setup-patches
" J' A1 \3 h, w# |( N; k ask patches [ set pcolor green ]8 E2 K" W, `- H$ I
end# b" \7 h( F/ A& ~8 V- H7 _( H' ]
to setup-turtles
+ W3 G1 k G# n2 b create-turtles 100/ Y3 ^# z, ?+ b3 T
ask turtles [ setxy random-xcor random-ycor ]
, A" v' |& N# y8 S# t) k- h+ ~end) |' h4 J. C+ D; c7 v* L
to eat-grass* n' \' H* p* f2 q" _. U
ask turtles [
% d" E7 @3 A6 `: G- J3 f if pcolor = green [
j' l( D7 h7 ~; E6 B set pcolor black( g% R N, g% l8 e l
set energy (energy + 10)8 q* f* [; A0 X `% i3 c( Q
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ifelse show-energy?
4 c" H Y7 R8 b5 }( u/ r" Z) E+ }6 P [ set label energy ]
( V5 J& E! n/ w* }& g1 W& J! h [ set label "" ]
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end
. D4 L& x! {4 e8 h5 Jto reproduce
9 G# u# T& E/ O) n2 |( P w2 s ask turtles [: g0 v8 U1 v8 T9 z
if energy > 50 [& ^1 a% q" i/ E$ m3 F
set energy energy - 50
$ V9 J. B9 R6 C, U G hatch 1 [ set energy 50 ]* C- e' a$ C$ X. Y' J4 I( _+ O
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end. l* ]! C) r5 i' N6 P4 x3 x- f4 P! {+ q
to check-death: j6 H' e# _, m9 k
ask turtles [$ J0 y7 l7 S- R2 W0 G' ~9 M
if energy <= 0 [ die ]# b9 ?. p- c- M% g
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end; l8 o1 F$ r7 c, _5 @! p6 r, t
to regrow-grass# b6 n* P) e y; k
ask patches [
: @% ~0 W2 P$ d+ o) q% A8 q if random 100 < 3 [ set pcolor green ]. R; e9 Y5 h4 a5 j# M
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end
1 S7 W0 O5 R* A. e1 _to do-plots7 i3 `1 l) N/ l8 @# T
set-current-plot "Totals"
, _" T# r/ @" r( ^& Z+ B6 o1 U+ M8 X set-current-plot-pen "turtles" d9 x! L* \* x% ^
plot count turtles
* f# w" F8 Z; J set-current-plot-pen "grass"
1 H+ [9 i8 v8 ~" B plot count patches with [pcolor = green]
0 B' u' W3 ~2 }4 ?end0 R: F0 f- C) ~% [) Q U
可是运行时提示no such plot: "Totals"
! d) V, N; g( Qerror while observer running SET-CURRENT-PLOT
! I, h" z P% ?7 R4 M. n& L& o7 _6 G called by procedure DO-PLOTS
3 p, w, G0 _) K7 s8 L3 l6 u called by procedure SETUP q2 [8 n& B8 u# T) y
called by 按钮 'setup'$ K1 m. j( P, y3 t9 F! A. I5 Z
求大神解答啊 |