我编的程序如下turtles-own [energy]
9 u" _( ^1 t3 ~& ] [" s9 xto setup5 ?) {6 g+ S, d- x- ^
clear-all8 i8 f, D3 B; C2 W$ A- q6 }
setup-patches
4 W# G* X( p7 t& U+ T3 i create-turtles 1006 }5 T7 w) C) B6 S, x) u0 e1 o; r/ [
do-plots
9 u5 p& a; Z" u' ~" S; Z ask turtles [ setxy random-xcor random-ycor ]
# C" D8 z7 \+ T: D& W# f: Z/ Oend
& l! Z( x! e6 [# \7 S' x! l5 e5 ]. A# ato go! x! H$ C, v2 M0 W. ~( E
move-turtles2 U) \ j# ?, j, G3 L' E0 w/ S
eat-grass0 Q( u/ y5 h' G" d
reproduce, l$ z. c/ E' T) r- y8 I2 {+ }
check-death
' U% I( `# y1 x' |3 x' A5 n regrow-grass
2 b2 [, P4 V$ U: P0 F; [" l do-plots$ @3 k. D1 k9 Q# E9 i# [1 O5 p# q
end* v5 _6 f3 T' B0 R" g+ M% @
to move-turtles
: p. y7 j) Q9 X4 I, \ a ask turtles [! }9 |9 B3 k7 a
right random 360
- E' s7 l+ A" o% K4 x. n8 t$ I$ I5 n forward 1' U8 G) V$ D" m- j
set energy energy - 1
+ A# h2 z+ @ k! _( `1 g% s ]
. h5 x- V/ [ }. |: @end; O! Z, S5 d1 F7 S3 ]6 i: @1 [* B
to setup-patches
- w+ U( D+ h3 b) }! ~, | ask patches [ set pcolor green ]
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to setup-turtles
: g3 `# e9 s7 w; y! R2 ` _ create-turtles 100, U6 S# S; M4 E' }% \
ask turtles [ setxy random-xcor random-ycor ]1 | Q# o8 s# s
end# Y4 W" _ A) i$ n2 B
to eat-grass
7 G/ H0 ?# l& Z* P ask turtles [% Q2 ^: j: Z) ]& @% i5 S8 g
if pcolor = green [$ Z5 y m. C9 S# j/ r
set pcolor black
: X) G; o3 A, l( Z3 ^ set energy (energy + 10)
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ifelse show-energy?! B0 q1 z9 G. P" F3 L3 T/ A
[ set label energy ]
0 n+ _ W5 V% c b+ l [ set label "" ]/ r8 ?9 [+ m% `$ S `) R% _
]# W+ v1 @2 i/ @! k) W- a! G
end& l9 C) c" w+ g# w
to reproduce8 Q/ v7 Z6 W( A' Q* |. G& W
ask turtles [8 P: g% j8 q7 G( |2 F! S$ K
if energy > 50 [
8 Y: Q( v. {" M8 r: D% h9 w set energy energy - 50$ M; P7 |2 a5 K( r
hatch 1 [ set energy 50 ]+ w# C% t3 }, w0 `( z5 O
]
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end
. j% ~$ E& E \) f+ kto check-death
- v8 P* B( Q8 b2 m# |( P: u( ` ask turtles [4 O% M. J3 F8 w4 d0 z
if energy <= 0 [ die ]8 {0 R& n: L* a- ]7 _+ m. @+ U a
]
% q5 L7 j2 q& v( qend4 O7 e' s. R" l0 m( v% u0 f6 H
to regrow-grass3 G) }5 Y8 Y. C
ask patches [$ [6 Q, p: x7 u2 j" {7 q
if random 100 < 3 [ set pcolor green ]
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end
2 q W& ?5 k5 h0 xto do-plots, F/ p9 a/ y" x5 u* b. c
set-current-plot "Totals"
6 {1 c: [* D0 ?! F; g9 [ set-current-plot-pen "turtles"* L& d; ^2 W0 @/ s# _/ H
plot count turtles8 z" W* |( }% d1 r9 H# z5 \
set-current-plot-pen "grass"
( E: ?2 T4 N4 S1 R2 z) b plot count patches with [pcolor = green]3 O, Q, \! c S1 F+ q0 }
end
& o' s F% \) b5 _5 [- x可是运行时提示no such plot: "Totals"% e N& y7 `) o8 j
error while observer running SET-CURRENT-PLOT& |$ H m) j' C% D% i
called by procedure DO-PLOTS5 v t( G5 A3 r, F6 ~7 K8 z
called by procedure SETUP q' _4 e" i3 j( m- }, e
called by 按钮 'setup'3 s4 I5 s1 F1 p" @. y# L
求大神解答啊 |