我编的程序如下turtles-own [energy]
: m9 _* W6 F- a; ]1 {% B4 lto setup
5 o% v! Y# V {7 u& n [0 t clear-all
* c, D& J" n, E8 b P; G setup-patches* d' V2 r+ F# J3 Y2 G/ [
create-turtles 1004 v% o8 r I5 m) I5 i; h
do-plots9 {1 |* i6 L# |' ^2 I$ q. R
ask turtles [ setxy random-xcor random-ycor ]! i9 b$ A% v: B% r" T; u
end1 o. j8 Q. y* e* @0 @4 c
to go
" [! _5 J2 R9 h& x, [/ r( ~+ e move-turtles6 Y" ^8 V6 S: z
eat-grass- c) a: L! I% S! S, b
reproduce
8 @) D8 A- @( }2 u# l check-death) |4 r$ Z1 E& A6 E; ?2 D: o
regrow-grass
. x+ i. q/ W6 a. f- v" y1 p% v2 O) u do-plots
1 i0 D4 Y/ m3 c) ]+ _end7 _1 Y* {6 Q8 J+ b D" t& c# Q
to move-turtles
3 A5 o* ?9 R+ t- Q s ask turtles [
0 G, v S A4 T5 y/ R1 p right random 360
3 C5 }0 I+ X. {5 f9 z9 e forward 1
: n6 {% s9 q; l4 o; m set energy energy - 1
& {' e/ k: ]( p2 r" o ]
: r- t% }. @6 p4 ~2 send3 t4 S/ d* h- v L& ?) T
to setup-patches
7 O4 P: W. P; q- F* b; e3 A4 M9 z4 A+ Y ask patches [ set pcolor green ]; x5 P+ U8 b4 d+ t/ v) _
end& n8 G$ M* J" q/ Z0 g
to setup-turtles4 l3 I( G5 |" v/ e& O. w2 v
create-turtles 100
6 ?6 G9 F; j- {6 W+ V" y ask turtles [ setxy random-xcor random-ycor ]' p* V% |% a& |
end( \- k8 w `' g& Y' `/ h6 q3 v- x
to eat-grass$ `6 l y# \+ i, C
ask turtles [0 o3 |0 \0 x% m8 ~
if pcolor = green [" m# F! _7 _8 r# y
set pcolor black
( u( ?; W* y5 H- D) K set energy (energy + 10)
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ifelse show-energy?6 g" v' E* I# y6 [- }$ T* d" `# S
[ set label energy ]% o$ N' g( [8 i8 d; p
[ set label "" ]8 P7 f7 z4 l$ S3 r
]4 f' T8 ^+ T" e) H
end
# E7 T! E1 w) D, m! i; Fto reproduce& H" p. K: @ T& H6 J z& {) V; z
ask turtles [
n- z- a" p: p1 S if energy > 50 [. s5 z5 H0 v. C' g/ A( G5 `
set energy energy - 50
1 G2 H& i, U3 c% F# w8 j/ t5 [ hatch 1 [ set energy 50 ]
V) |5 E2 j6 M8 F) i ]5 \) f/ F5 l7 M; V7 ^8 I, f
]
; L% h8 m6 ~# x7 Nend
& |) p- W4 K8 [2 Ato check-death7 G: ?# D; f' _2 @
ask turtles [
) u( p9 B2 b" j! E if energy <= 0 [ die ]; z& N: C+ M7 m* A$ r4 ^0 C
]
: A' a# e- F; ~3 h; G8 vend
$ g7 V& @5 r( W1 ito regrow-grass# y5 U s9 b( {1 X8 Y( F+ u, H. ~
ask patches [& `; Y2 C: I! O, w* _5 b
if random 100 < 3 [ set pcolor green ]
1 }% C9 @% V& y" X* n3 |* X ]6 K# X% s6 `. x+ z
end
0 {8 V* f- \1 ]5 d) ?4 K1 }: wto do-plots
5 G5 s( z( U1 P1 k! g8 `7 u8 C/ M set-current-plot "Totals" l( B- Z. `7 O c3 s7 g! B. q
set-current-plot-pen "turtles"
0 ]+ t7 H# R1 W- ~ plot count turtles& m e$ M) M1 T# W
set-current-plot-pen "grass"" k: r- ?5 F/ a' I* Q. N4 H1 t
plot count patches with [pcolor = green]8 v9 H0 S6 {! e8 }4 [( z/ p
end3 `5 ]' _; j2 T/ D. {# E
可是运行时提示no such plot: "Totals"; I! R; K) R+ }! `
error while observer running SET-CURRENT-PLOT( G$ Q- Q0 x* Z! K8 `
called by procedure DO-PLOTS3 y; ]5 g: ~) K3 E
called by procedure SETUP) C7 |! M! y/ m% I" Q
called by 按钮 'setup'
1 E$ j% i& H3 z3 a w5 d& O6 Q6 V$ ?求大神解答啊 |