我编的程序如下turtles-own [energy], x9 e$ i& _8 J3 B
to setup+ ^: E5 Y* S* F8 [0 l
clear-all
7 c9 E& V8 k, R( \! ]; s setup-patches
9 A0 \1 m: l4 t' A, x* w create-turtles 100
4 u- K+ [( k7 A do-plots
! E3 l# } w5 x6 @0 \ ask turtles [ setxy random-xcor random-ycor ]3 M4 s- Z! t" p8 |( F- N1 t
end
" e9 [& M- D& L2 X* nto go+ {8 _4 _- p: W( ]7 ^% O
move-turtles
3 e3 i- S+ k, W: \ eat-grass
$ ]* R# ~2 k1 q* z reproduce* z1 J$ Y" j1 ^: X0 Q i! V/ Y. r Z
check-death
8 [& A" H' `! B+ G regrow-grass
U$ I" }' U/ O: D do-plots
0 E& K! z5 b! Y# m9 f! b( Wend
/ w. M2 G! h/ [9 s* m$ Tto move-turtles. I1 w/ d- p# n% X- m" E6 }2 d
ask turtles [
1 R6 n- G) }( q. `/ O right random 360
' W3 v8 @# Z6 q# [' [ forward 1
2 p5 i: i0 u0 U7 X1 ~/ V set energy energy - 1, ^ v0 O# V8 `' |
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end
% @: B; `- k# w( e) X3 rto setup-patches) b+ k! Q' z' v" v' |
ask patches [ set pcolor green ]
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to setup-turtles1 N5 M. w0 V. [+ y3 Q6 z; O0 E
create-turtles 100. i6 [. I1 P+ K* ?, W V
ask turtles [ setxy random-xcor random-ycor ]- u x% m. S3 l P/ y
end
; i/ q5 J- L9 Gto eat-grass
9 M, h6 j" |$ K# S: x* ^ ask turtles [
, s8 s8 F p% D+ ~4 w9 Q if pcolor = green [; s @7 \: |( w& t, ~
set pcolor black% z# G9 e. }6 }7 U
set energy (energy + 10)! X- V! e, l/ b% o$ F
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ifelse show-energy?( M9 E! p% D+ {' T9 Y
[ set label energy ]$ S. a' n9 p& c6 R1 k$ P
[ set label "" ]
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end
9 C1 z, E; p, R; b/ ^to reproduce7 L/ p9 |7 I, H X) c# W% b% ]- r' n, H8 P
ask turtles [
# Z8 F7 \- G) z+ u `4 q if energy > 50 [
! M @6 p1 h2 s) t8 d+ p& O _ set energy energy - 50' v: i+ Y. D( ]' n& w4 y2 h* |: k
hatch 1 [ set energy 50 ]" k! P7 w* S3 H* q" ~; @7 F
]
& u2 L( k7 A; Q" \& y3 w ]
& y# f' M7 F: H! pend# }; ]3 k3 ^ w+ X1 a. J- M
to check-death3 p& C+ c1 t6 P* ]$ g
ask turtles [
5 g! X# z# J+ A& Q) l, s, T* R if energy <= 0 [ die ]" F4 }& ] [; ?0 P" |% A. H6 Y' Y( S
]' S0 s: g( G2 O. F4 u! M
end
1 \5 v4 Z- v& W; [$ X( mto regrow-grass' r- S! l3 N& s3 [- Y
ask patches [
0 s+ n3 T* U# p4 m if random 100 < 3 [ set pcolor green ]
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end
q3 [5 I; f! i9 gto do-plots( y; {8 r X5 J9 ~; f+ o# @
set-current-plot "Totals" c1 Y% \* N8 [, ~& H
set-current-plot-pen "turtles"
M7 `6 [5 c8 y* K plot count turtles
3 p, R: ^2 X e2 x. y; {- T set-current-plot-pen "grass"
, ^3 D, k& L3 q- R- v% X6 R: L8 s. v' L plot count patches with [pcolor = green]) |2 h6 {6 m2 D% F1 T) G
end. Z7 p% V! G; K$ Y. C, y
可是运行时提示no such plot: "Totals"" l4 `9 R6 q5 N
error while observer running SET-CURRENT-PLOT
2 H4 Z/ y" D; A) x0 c* p called by procedure DO-PLOTS
6 O3 c+ H- O# w. l! I9 [# v called by procedure SETUP- M7 r5 |0 w* i9 W2 p$ y
called by 按钮 'setup'- F. c3 ^" L$ e
求大神解答啊 |