我编的程序如下turtles-own [energy]1 T* A" e8 i' Y& W
to setup
y! n9 J! t5 S: ~ V5 f clear-all
8 l( u( w b' a9 E9 y! O1 A setup-patches4 K6 R) i( F' W! S2 _# H$ K
create-turtles 100# Y9 i1 e8 U' ~
do-plots9 D8 j- O. b7 T: D) m7 m
ask turtles [ setxy random-xcor random-ycor ]- g5 i. C" s/ n; `4 o+ [ q
end& A) S7 m" {/ X& Y
to go' _- F- Z/ P2 o& `$ o$ d I
move-turtles0 s/ w1 o: K! X, M8 I/ i( k% `# Q
eat-grass' k; n( c; Y6 f5 ~$ j3 g
reproduce: |! m$ D3 k+ S, @' L6 E
check-death& [) G' ~) x5 @6 ~8 J7 e
regrow-grass$ U5 d9 A9 O% W
do-plots0 ^3 W! F# A& q
end2 U1 z; Q: B" m& f( C
to move-turtles1 G5 e8 V H" q# g
ask turtles [3 _+ l& t# L, m3 c- @6 Q- \
right random 360' b* _2 t6 U2 s* M1 e3 L
forward 15 e- K m8 B, l( X: v
set energy energy - 1; l) c, ]4 S1 f8 h
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end5 }# g( a/ q) f& _5 b
to setup-patches
, o" B# k: ]% N ask patches [ set pcolor green ]' _% w$ v8 m3 r8 _
end
% }. q9 A m- i! p4 Hto setup-turtles$ Z" Z, k1 ^+ D0 A" l5 A8 T
create-turtles 1009 l7 E( j U6 G) e
ask turtles [ setxy random-xcor random-ycor ]6 |& a7 I" o- ]
end
& @- ~. V, ]2 B8 h# h2 @7 g% tto eat-grass
v& v6 W9 `" D ask turtles [
$ a0 D, h+ X. X if pcolor = green [
g1 Z+ ]4 Z# C set pcolor black9 r" U5 U! `, I! }- x# s3 h
set energy (energy + 10)
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ifelse show-energy?, L! `9 [* Z9 |0 D$ _. x% m
[ set label energy ]0 Y8 [, k: Z1 t7 y* A7 G; ~ ^/ l
[ set label "" ]9 `5 d9 Q% `) v7 f# y
]
0 ]6 Z5 O9 s- T3 [8 g6 yend
7 @; K$ {' j( {: D1 q' Ato reproduce
, k# ]/ k: V# N. g ask turtles [
: I9 d1 b- y. [9 ]* ?) H if energy > 50 [3 Q7 L0 w7 l) l& C# ?1 I! f
set energy energy - 50
5 j8 L" |) y# {; x# k0 D hatch 1 [ set energy 50 ]
9 i$ o/ i0 b' } ]
3 {# P& o: I9 y4 x1 M4 `4 E2 z# t ]
4 w+ q6 c8 I+ Yend
% K: d, {4 O( }to check-death
, v$ V8 K7 I& K. [; Y ask turtles [# \; {% v5 t% W/ Z9 d- \
if energy <= 0 [ die ]
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end3 ]4 V8 J$ @5 U& J2 l7 X/ U
to regrow-grass% V" ]" z/ ]+ \
ask patches [' E9 D3 q( c: ]/ e. ?! J! e
if random 100 < 3 [ set pcolor green ]
+ D* G3 k8 Q% C- O' u# } ]
; s2 _9 ~1 q. e! [' A, qend
' E; B# A# F s, l. vto do-plots
2 B0 e0 j5 @. M2 D9 Y/ t/ N# O set-current-plot "Totals"8 n* u' Q# r, i; t, t
set-current-plot-pen "turtles"
, |; U* \. l# p plot count turtles+ q8 F- I7 ?$ ?" X3 w& v
set-current-plot-pen "grass". T! @8 o! j" u: `- H8 ~' R8 \
plot count patches with [pcolor = green]4 u9 p8 ~! F, x: l% B, y1 G8 |) g
end
8 X7 O) d! L+ b* t可是运行时提示no such plot: "Totals"
+ [* [4 s3 z! H5 f1 Herror while observer running SET-CURRENT-PLOT& ]/ X# Y& W8 J; y5 d
called by procedure DO-PLOTS
- _/ a2 o( ?2 Z' f/ w* k. g8 y! {- H called by procedure SETUP
" O2 j0 U1 d7 f: x called by 按钮 'setup'
2 v: M% H/ i' ?) ^$ L求大神解答啊 |