我编的程序如下turtles-own [energy]" z" J$ l8 N5 D, F% C# M
to setup
) f9 b$ |4 U' f! [ clear-all- C# A6 l) `: y ?& w0 E: z( x
setup-patches0 l8 [3 q) }& d( Q& O
create-turtles 1007 K) u& I4 X5 `2 p, V# K
do-plots
k y4 s! e+ A0 _ ask turtles [ setxy random-xcor random-ycor ]
* s& X, j# r! `end, p, e. I7 r/ P! g$ y$ [. d
to go$ W8 \ A$ R& j$ e( w* y/ L& E/ A8 w
move-turtles
- [3 p. f& q7 I1 z, S" P' j- s eat-grass1 S/ C; W _& l" E
reproduce
3 f3 v& i5 v' Q: E& P% a) F check-death1 V* a3 C( f: @1 ~& |( v
regrow-grass$ \# e7 L4 {: p# x. |
do-plots
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to move-turtles
2 Y! E& p$ h$ x$ w0 H6 y6 c2 R ask turtles [, |0 |0 ~, G9 X8 V- v. G
right random 360
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set energy energy - 1
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end
' i8 U0 T; ^- C4 p& sto setup-patches1 t6 [( f1 Q/ V( H4 V
ask patches [ set pcolor green ]
5 [0 a0 b; G0 u0 ?" m% f8 ^5 \end# I* l" h- O ~$ \* G5 B
to setup-turtles
. e/ [' ]: l3 R: L y" m create-turtles 100- U1 v" c3 P: R# k. M
ask turtles [ setxy random-xcor random-ycor ]9 x* a3 R; P0 m8 `- h7 i# d
end
/ z- D! ]1 z6 j$ ]7 w+ N% b8 _- Fto eat-grass5 a& N1 p/ H1 j) [0 N: |, R
ask turtles [1 A: @, w. \3 X4 t2 t6 d0 u" k$ M2 b8 Z
if pcolor = green [% x9 P5 H6 y9 Q' u; E8 Y5 C
set pcolor black
$ W' y, Y% i6 q( |5 k set energy (energy + 10)
% \0 u1 A. d+ s/ } ]
( z9 A$ I) P1 @! w+ x: { ifelse show-energy?+ a6 I+ ?% h% R7 _7 B- a( `
[ set label energy ], ]1 Q4 R& x+ m* d; q1 E! l
[ set label "" ]
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end
9 H+ G- {: Z& `' b1 V! B$ jto reproduce
, {0 ?" D* i3 x6 p/ X ask turtles [
) P% b3 Y8 e3 g0 O: \* r if energy > 50 [
, X3 J! d8 J5 u7 g/ N; } set energy energy - 50
0 e G. Z1 N# j: [7 F( ?: K hatch 1 [ set energy 50 ]1 @- {$ Y* v! X# q5 J3 z
]
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end" m8 q4 ] `) a/ g+ W8 X
to check-death
4 W- k, V: P B5 @ ask turtles [ H& d1 J" X7 P
if energy <= 0 [ die ]
6 U8 i( \; R4 [8 E2 N% } ]
) U1 d: ~- |; g7 Xend
% E @/ {* y$ Q2 `* I6 B+ D3 @8 a+ |- Zto regrow-grass d: }. E$ r) L& P9 X4 s* p2 H+ s
ask patches [
7 e% o6 E& F/ g: w% C if random 100 < 3 [ set pcolor green ]
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end3 u$ x8 ^5 I4 J/ ?9 Y8 G# m9 k
to do-plots
) S. [* X3 e) V: y: ^# _, c' e set-current-plot "Totals"
) }& U4 G) x% x. U1 K$ ` set-current-plot-pen "turtles"
3 M( s; `% ]9 F) I" S5 ~, s plot count turtles
; F7 j* U5 s9 I T set-current-plot-pen "grass"# V3 C& c" G0 E1 |
plot count patches with [pcolor = green]! h4 q& J+ Y! R8 e
end. z& V: c7 @+ y. x4 j
可是运行时提示no such plot: "Totals"
0 |& [. U ?+ ?$ Yerror while observer running SET-CURRENT-PLOT, `* c; Z2 e' L- D, h
called by procedure DO-PLOTS0 U3 ~( M. _3 |) Y! R
called by procedure SETUP$ q6 V6 v& x6 q; N1 i
called by 按钮 'setup'4 j5 `; n# K z& H c
求大神解答啊 |