我编的程序如下turtles-own [energy]' n& ^( D) h& @
to setup
7 F8 t" O! U$ J" _ clear-all
- J7 f$ L/ J& Q. |$ G setup-patches% {) G) I- G. _
create-turtles 1004 | c6 l3 v/ y4 V- B7 |1 ]
do-plots- w6 a! j3 U5 @" p3 o( @; \& j
ask turtles [ setxy random-xcor random-ycor ]
1 Q6 `8 {8 ?, T: D; dend' H3 T; B4 _ o; n3 b
to go) _! K( G7 k2 U
move-turtles
8 e& f( D2 x0 w( l3 z, H g5 _. I) e; t eat-grass7 s2 h( d: R6 M
reproduce
3 ~% f3 g; l& U0 l$ J; I check-death
& M( ?. m& Y ?) g regrow-grass F5 C3 K+ T& p, j; ?: U9 t
do-plots9 t; a# v, t, @+ h4 q
end
, X3 \* n+ w- f( bto move-turtles
: g2 g" ?! F7 T ask turtles [/ t" b; T, w5 i! v5 m. P4 ~
right random 360
% A% E6 `$ c4 U0 }8 ^% M+ p forward 1
1 o9 A2 R2 U# \2 x5 C% E K' P set energy energy - 1
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end
% i5 _. u# v) q0 r9 wto setup-patches
+ v8 \. x1 f- ~# x( `; r T ask patches [ set pcolor green ]5 @ O. {5 D$ a1 Y; l
end" T6 B$ y9 [( L0 S
to setup-turtles, M2 g( P8 \/ E9 D3 R+ X
create-turtles 100' @2 y. e7 ~. p! r3 }( x7 I" k
ask turtles [ setxy random-xcor random-ycor ]
$ u9 H8 ]: V: ~0 g, P2 cend; j7 m+ X( e7 S' j
to eat-grass, }7 q! K8 w4 B7 n2 t/ v
ask turtles [
% p( f7 z; n4 y2 _- ` if pcolor = green [
. Q2 G1 j& D$ C# x7 b: W, k% J set pcolor black r0 p9 W( f9 O7 Z3 G# m: X
set energy (energy + 10)! y+ C0 @% @% Y
]
% F% j, k$ `* E& b _ ifelse show-energy?
0 W' n9 Z/ L/ O, b [ set label energy ]7 D# Y1 X" d: C5 Z
[ set label "" ]
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: {! G( G) k5 A- send
: V& `! a# {* Yto reproduce6 [7 Y. ^: V; t; D
ask turtles [- u/ B q: Z3 J# n3 P1 p1 R
if energy > 50 [* G& K# V- z& o" t& D5 i; p, {: K+ g2 ?
set energy energy - 50
- i' L/ {) ?+ Z8 F hatch 1 [ set energy 50 ]& L# I1 k4 H3 A4 Y, Y& U6 g
]
8 g; p+ X' c, n7 _/ d7 U# e ]
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to check-death
; d/ T- W# D8 F" M ask turtles [% K3 S" f: W5 @7 f# ~2 ^3 r
if energy <= 0 [ die ]4 s" T9 J2 a* k: R8 S
]1 {$ K3 F: I: X4 j6 x/ S
end
3 L3 |, |- K9 P1 P1 sto regrow-grass
9 I+ B$ h6 w4 b$ p ask patches [' q$ u: J, o6 A @, j! Q
if random 100 < 3 [ set pcolor green ]
9 e) t) f. Y C ], q' W* ~0 ]3 S' d" q# _! i8 }
end
. ^' N! W$ q! ^to do-plots! N* U4 u" R. N6 j
set-current-plot "Totals"
2 ^$ Y2 k. }7 ~3 a set-current-plot-pen "turtles"# k2 Z$ d I3 a7 A" Y3 X
plot count turtles( B2 K& O1 K* a* w3 X1 Y
set-current-plot-pen "grass"3 h+ |2 T! m; O, V1 ]0 u Y. I+ M
plot count patches with [pcolor = green]
6 K# L/ z4 x7 ?/ F; [end! [$ S* Z# H+ }' U" L5 S( s- U
可是运行时提示no such plot: "Totals"5 _" I5 a6 q8 P1 S9 I3 u5 h6 K7 x
error while observer running SET-CURRENT-PLOT+ ^2 C8 ~" N7 q* B
called by procedure DO-PLOTS9 N9 I- q- m2 l& B
called by procedure SETUP
, a3 n# N* g$ Y called by 按钮 'setup': ]5 M: f' z+ P- N$ O
求大神解答啊 |