我编的程序如下turtles-own [energy], `( T2 [4 u2 j8 r
to setup
4 U- u$ i1 W1 f3 N clear-all" S+ i7 o$ K% }0 D$ U0 j( b, v5 s
setup-patches
5 S. c1 J7 D: l) v; M create-turtles 100
6 Y8 j, R+ d$ P4 v" l do-plots
) I: C# x7 m% s' l; P& m, {. Q ask turtles [ setxy random-xcor random-ycor ]
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to go
: b# e$ I( A4 G% R: j move-turtles, H$ F/ M7 q- r6 t
eat-grass% a: e. ~. h/ `6 I
reproduce- j* M: T; V* P. I6 | b
check-death+ i! @2 L% Y) m
regrow-grass
9 i+ @+ T* ?' E$ ^+ ?# g N do-plots
. |- q: g( ]3 q# f; X* i5 Qend
* U: }' b& H) a: w* t3 G+ Gto move-turtles
% v% Q) J; {; ]/ I/ F ask turtles [
; W$ O* ~1 t# u% d5 p" P9 f; }' G right random 360
7 A! e: }9 k2 {# I' Y+ G forward 1# D" L o) D% [* Q
set energy energy - 1$ W0 D4 H% Z% w; u' p
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end p9 f9 P t; E( P4 L% i7 X' k
to setup-patches) Q. Y% m( \+ Y. A' Z- u
ask patches [ set pcolor green ]
0 q# W! R: S5 j& C6 L' }: r* R W3 kend
& J/ i0 E0 G s2 ~to setup-turtles
5 E& o+ A' W. d3 j) \$ J9 j create-turtles 100
1 M- @' V$ n! y% [& { ask turtles [ setxy random-xcor random-ycor ]
6 T5 z8 Q/ j7 ~* ~% `+ Kend% b! o/ j' o+ m* v2 o o
to eat-grass
3 ^( ] _+ W, r K ask turtles [
8 V2 {7 {2 v$ F% A8 o if pcolor = green [8 k# @5 z$ x& D4 ]
set pcolor black, r! b& s4 g. s: [
set energy (energy + 10)9 d) j/ X2 ^8 x
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ifelse show-energy?
" i/ C7 S5 L. ?3 C [ set label energy ]; P) x* @3 W7 z6 L) N( h+ R: v
[ set label "" ]5 z# ?& G! T) q: N3 R: g
]! N& W8 K( N3 G, ]( B
end u, G$ r# ^# g5 I* Y4 f# n
to reproduce
: ?6 }- ^/ ]) m) U. J ask turtles [" T4 ~& U3 A, e) d( \8 i) y: A
if energy > 50 [
+ \ v* \1 K+ b# Q# F# b2 v set energy energy - 50
7 o/ v. b" [8 @/ O4 Y0 r hatch 1 [ set energy 50 ]
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]2 j$ U7 K0 l8 ^! E7 c U
end n% s8 ~/ l' Y
to check-death
: `8 {, o6 J& @. _; i5 y# ^ ask turtles [, F0 m: W# g2 d0 k# ]" Z* h8 W
if energy <= 0 [ die ]6 N1 R! K2 j- L" a, }$ i
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end& X1 ?# Q5 w; S* F
to regrow-grass
8 K' D6 c% N% b6 x ask patches [ B4 [& X& n6 B- r/ Z7 c) I2 `2 U
if random 100 < 3 [ set pcolor green ]
, Q1 b, z) p3 {6 Q; e. `& ? ]
6 Q9 f" {# r: O$ [/ tend
& ~; v9 L \/ q( P' g2 uto do-plots" m+ O& ]$ }' s) P' l# E; x
set-current-plot "Totals"
$ S$ M' [$ h8 U5 }- A) t- Q5 k set-current-plot-pen "turtles"
+ j. K- i: Q* ]( M. S plot count turtles3 R& E3 b' ?. V5 q, A( h
set-current-plot-pen "grass") j) E' A2 t7 ^/ E: ^0 X% g1 i
plot count patches with [pcolor = green]
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8 T. Z9 H, C% ?9 A: u3 \可是运行时提示no such plot: "Totals"
3 W& z* O( K! }error while observer running SET-CURRENT-PLOT2 [% G( X% ]* T4 g
called by procedure DO-PLOTS
8 f+ l2 ?8 B k* p called by procedure SETUP
L3 E% n' [0 Z called by 按钮 'setup'
/ b4 H% o) x( T6 c求大神解答啊 |