我编的程序如下turtles-own [energy]( I% W+ E$ @1 `) B! r# e, d
to setup
3 c3 V# G3 B9 \4 o6 U$ r% ~ clear-all) e- D0 V2 A/ c6 t8 ]9 }. m
setup-patches
; U9 O f, X# H& @ create-turtles 1004 _% ]/ ?) y# j; U; I# v3 [; V
do-plots
) t+ c# Y! K3 Z: m ask turtles [ setxy random-xcor random-ycor ]
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to go) ^8 u: c1 f5 |, Z
move-turtles, l# Z* \" A$ \9 y
eat-grass
' z" y! U( f Q$ L' m* F reproduce. J9 G9 w1 l6 T$ Q7 C' h* g
check-death
6 |: @7 |% w# Z' _: n+ K% t regrow-grass
8 Q! x j; |+ c& h' ^1 R9 \) P( w( g do-plots
# o% k8 X% M$ oend
% ~( T/ A0 o S- M( [to move-turtles3 r3 O2 c0 H0 L4 @
ask turtles [
' `) S! p* d, c9 H- b; m right random 360" }$ \" q: _8 ~
forward 1
8 l6 o$ m0 S1 M! a6 v9 d set energy energy - 1
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end! d! ]; E/ \% s
to setup-patches/ e' Y- n" j- ^/ H- X$ M
ask patches [ set pcolor green ]# \7 q e5 D" ~7 ^, Y
end9 x( {3 b: e/ s5 p4 p
to setup-turtles1 Y8 m. X7 W' d$ Y8 x
create-turtles 100
2 w8 i4 X- u! Q# b ask turtles [ setxy random-xcor random-ycor ]+ A$ j# P# O g2 |+ K
end2 |, d" K4 g: y/ q2 ?! M
to eat-grass
% g' `5 e7 Z4 m: X, B ?4 m ask turtles [$ c) s7 o8 V0 f% K& i3 k
if pcolor = green [: I. |- P9 l- J0 T& D5 ?
set pcolor black1 ^0 J' X8 C. m
set energy (energy + 10)6 O% x1 N! Q7 \: v1 W) l- L2 Y
]+ G2 e' v0 \/ X+ y! x/ P
ifelse show-energy?
, K1 I; Q5 D- U: E' x; b( M [ set label energy ]# b/ @4 K3 h1 e& @% _
[ set label "" ]
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end
2 P% m9 v( Y* G3 N/ ^) Cto reproduce
8 p" f% ]/ a2 A7 z A ask turtles [
+ L8 g8 A8 t( I) a if energy > 50 [
3 v6 Y8 O0 s- o+ d u5 `# w; r: L set energy energy - 504 ?; `! }0 \; d2 W$ t4 k( M
hatch 1 [ set energy 50 ]3 B: N, A& |0 n/ q) z6 n2 c- I5 M
]
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end
2 s2 Y$ }8 e) J6 O; i' k9 ^1 dto check-death1 g% m3 I* T( z8 x4 j7 t. h1 ^& e
ask turtles [! m5 l" M% z; {9 e; n: A# U* m) @
if energy <= 0 [ die ]
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! J+ G. S9 N* X q' _: Xend4 ?" Z6 ]0 E! n& k
to regrow-grass5 d& Z* f3 h$ T9 N {$ B
ask patches [
* D, G. P" x* b! e5 e9 V if random 100 < 3 [ set pcolor green ]3 P% D) I% e+ \3 [% U$ m; P. R
]* Y/ t) [4 {) h; ]. B& ~( ` p
end
) H! ^5 B% p o9 q3 L. e( r% Sto do-plots
+ ]; j! l* s" e% Y- J/ t. U1 e/ v5 M( s set-current-plot "Totals"
. b/ i$ z1 d7 P: I# {' M set-current-plot-pen "turtles"2 j8 d" n; ]% z3 k! K; G* e0 s' L8 `
plot count turtles* m; o n V! Q" Q$ ^
set-current-plot-pen "grass"
1 {* G3 g2 F( O: t plot count patches with [pcolor = green]; Z+ O2 O5 J$ M0 U" B6 A' s
end% O, Q+ p% V m9 B* ]; A8 Y+ ?
可是运行时提示no such plot: "Totals"8 b! P) k0 m, O" _6 C) k( b
error while observer running SET-CURRENT-PLOT. a, q: T2 p4 _4 L* w
called by procedure DO-PLOTS' U6 U2 d0 v5 x6 z( f5 k
called by procedure SETUP; y; w; b8 M) r/ p* A, J
called by 按钮 'setup', N. X( |. E1 m% \8 }
求大神解答啊 |