我编的程序如下turtles-own [energy]- W" J* @, P7 Z% n1 ~7 R. e
to setup4 T5 i" M" F2 H8 c
clear-all9 i9 C: \" B/ u, S& V
setup-patches
) n) H: r3 _; _6 S6 q create-turtles 100
/ |7 O: d, d% p( p; f0 R, h: Q do-plots6 _9 u, p6 h9 k) z1 b$ G) N
ask turtles [ setxy random-xcor random-ycor ]
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to go
6 v8 B# W$ d0 f/ a) i$ X7 l5 u7 r move-turtles
7 f2 ]! T6 [. J* a eat-grass
; N5 P) p7 H' [& U$ L" Y reproduce
3 X* \5 g2 ~+ m6 B4 m$ b" d check-death: F" M2 Y' O; z7 F9 e+ {& @" U+ B
regrow-grass6 f: b9 A) `( Q% V/ _2 [
do-plots
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to move-turtles
3 K1 X! C# C4 N) x ask turtles [3 [9 T: o3 t$ c$ b5 `- B$ q4 c# {
right random 360
$ |3 ]; E k$ n; q1 I' z forward 1
) H+ O: D. r1 {4 l/ v3 X set energy energy - 1" m0 {4 a1 \4 E/ X( F9 f0 x
]
4 c" I9 g* W/ x2 g. {) lend
& `& \5 g! R& U$ T4 w0 M( J6 b& kto setup-patches
3 z' F9 R+ K' D; l3 c ask patches [ set pcolor green ], [8 M! u% r$ o, k) R* l" P Z
end* i6 ^7 V% m& y
to setup-turtles
) a& O& d( C) M' U( p3 Y create-turtles 100
& c9 b8 Z! J4 C8 k1 D, S ?1 w ask turtles [ setxy random-xcor random-ycor ]0 }( u5 }; t+ F" V/ p+ ^: v
end! b% N4 q0 V& ~$ f/ J) k! V/ _5 e
to eat-grass! o$ D7 a3 O& o6 W
ask turtles [# @ I1 v# \6 P) ~( K: b
if pcolor = green [' z% j, _7 l- d6 S5 ~- m2 _& z# Z
set pcolor black( x" ~& m3 r9 S
set energy (energy + 10)
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ifelse show-energy?1 E8 T% Z$ ]7 r# o# P I, q0 i
[ set label energy ]
1 ~( r/ a5 C/ p/ B' C; ?6 ~ [ set label "" ]
. k) X" T; g( d" n0 O ]
6 C* f: p6 z% e" pend
) j: U5 D0 ~& @. U0 o @5 lto reproduce$ O. O3 j' h3 l! v# z0 C
ask turtles [
2 I9 r0 C0 {8 l# Y4 F if energy > 50 [ M' ]. e$ K, X9 I1 _0 G1 h
set energy energy - 505 k; u) q! ~" x: {1 X
hatch 1 [ set energy 50 ]
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& x- q* B; N1 _6 H+ w, | ]
+ v0 o% n, D( u* N0 a3 m; V8 p/ |4 ?7 Dend8 I" F9 r5 x" e
to check-death
- D& }9 F0 y% c# m2 ^, Z/ j ask turtles [
$ ^+ Y, s$ S' l; V W if energy <= 0 [ die ]
& ?1 h' G7 ]* I0 d% f ]+ x0 ^# ~& k- ~, L ~% |0 K
end1 e) f& G+ M, Z) Z8 J0 L. H; m
to regrow-grass& [ z9 |" D( q l( F) q5 ^. P) h
ask patches [: u8 H' ~6 D n
if random 100 < 3 [ set pcolor green ]" |0 x. m4 g1 `" G' a* m
]
/ g2 q, W9 g5 m9 H) W6 b+ {end( d. {0 T8 C; B8 {3 P7 Y M0 Y
to do-plots5 L& e& p* x. B- g. Z( O9 w& Q. }
set-current-plot "Totals"9 [2 A1 h! a9 I* A6 N
set-current-plot-pen "turtles"
1 z; p8 g6 y8 g B7 ?- V, Z plot count turtles
& `: t, `: L& Z0 { set-current-plot-pen "grass"
9 L, y4 h; n. `5 s3 W$ y' u, R plot count patches with [pcolor = green]) _+ A+ a4 B. H: `. Y2 p& F
end4 R9 Q- h: a" A0 L) K( F4 _
可是运行时提示no such plot: "Totals"
U7 m. e7 V. b) v% derror while observer running SET-CURRENT-PLOT: M$ `" M+ l1 r `
called by procedure DO-PLOTS* q* k2 y$ X* M9 Q% _' T
called by procedure SETUP: `$ a9 a/ F- Y* R0 y( J/ j- e* K" @
called by 按钮 'setup') o3 h- f" ` z' P+ A! d
求大神解答啊 |