我编的程序如下turtles-own [energy]. k* P! U g- \ N: a; e" }; K9 Q0 f
to setup' J1 g7 i( N: V$ v* S+ f3 O
clear-all
( p+ h) b1 C2 }" a setup-patches' m. L2 j' V& a7 ^5 I3 [. x
create-turtles 1003 {- m3 ?) ^# Y d
do-plots s( ` r* g' W1 ~% Z
ask turtles [ setxy random-xcor random-ycor ]
: q( W; J% W6 \7 U0 Oend* Y& l6 E+ u Z2 t
to go
" }( G3 _8 Q! n$ y% k. f) \ move-turtles! [+ d+ b: X5 ^- n+ `
eat-grass
$ m: G! Z6 [& F2 K& H/ t reproduce
% M# k6 n; C6 Q9 t7 i: @" ` check-death% L7 c+ A3 D6 Q& ?1 z
regrow-grass
' ~3 P/ V% m7 C" U. T3 W; @* d do-plots( O, ^1 W6 e4 W( L
end* e, S' _, h4 s5 q
to move-turtles6 c4 \; v) R2 _4 q
ask turtles [* T6 I4 s& I- V
right random 360
& S6 C/ t9 Z/ V; R% k8 b/ l1 @ forward 1
! H# ~- k+ z- Y( b1 e set energy energy - 1
* y+ I! o; R5 l" Z/ h ]
- ]. O6 j, O6 _8 M" gend
( S! j- P$ k9 lto setup-patches
9 O0 ]$ `( @, \ ask patches [ set pcolor green ]7 }$ c5 \& f) D+ T- ^- c
end
: D$ c3 e% L' j, {to setup-turtles3 w% P1 o1 U) Q5 [: ?2 e- C( r
create-turtles 100) y! ~( _. r8 x; w
ask turtles [ setxy random-xcor random-ycor ]1 B; ~" h O. T9 f S2 g0 ]
end3 P. a! F" U. q" S2 q* H2 V
to eat-grass% i3 c# {% p1 b' N9 \
ask turtles [2 E, V$ F3 G, i% s
if pcolor = green [' E7 ]8 W' m+ x+ |1 W1 i; r0 r- d
set pcolor black$ p. b+ v# z7 n
set energy (energy + 10)6 z# K/ u9 n* z% g7 [
]
$ b" a* n; t+ ^7 T3 o' d# D ifelse show-energy?- R. E1 S0 w% g0 k, C& q! y
[ set label energy ]( `! B8 U2 Y) k4 l2 V% W
[ set label "" ]
( S% Q( p5 H4 A% w; T7 H ]
: [0 t* _8 M; w7 |end; d" |# O# M/ u- M* t5 S6 `6 Q
to reproduce
+ v, D: b r- n$ J ask turtles [
: S$ S) _- e7 Y' A8 l. s if energy > 50 [
) B. ]( k" p/ n6 R set energy energy - 50) B9 o5 f8 W5 g: C* c+ v! l
hatch 1 [ set energy 50 ]* [% G! t$ P4 |2 T3 s2 P. V: L; ?
]
8 [& L; Z9 f# ?( ^1 d ]
- o$ V; \ \1 mend% X R9 F/ d/ {* V" _8 f+ e% P
to check-death
; D2 v0 y2 l& C) Z4 j( _ ask turtles [# V! Q& ~+ Z- c$ @# R- n
if energy <= 0 [ die ]
, m, e( S) z1 ^- E: t* k: g ]
$ K% x! ?% s. n3 o. f$ [$ Dend* z& A0 m5 y) A$ Y
to regrow-grass
/ c1 j# K5 S9 H ask patches [
q% r$ K }7 ^& F2 w if random 100 < 3 [ set pcolor green ]# X' A8 _" m7 b( A( T& C" t
]% c2 C$ s: r3 Y* {- T) H
end" i2 O1 P: r6 b. h9 A9 Y
to do-plots
( r0 Q3 k9 \; v" _' S( Y- k! ~ set-current-plot "Totals"9 T& W6 e. `9 L$ ~
set-current-plot-pen "turtles"
7 I* F+ n+ u( S9 A plot count turtles& H9 p( e4 c5 V
set-current-plot-pen "grass"
" S7 K# ^& K# v( o3 Y plot count patches with [pcolor = green]
0 p) i+ G) K/ a$ t2 ^% X- ^; nend! T& m' K5 W3 T9 j, C
可是运行时提示no such plot: "Totals"$ V$ x. i( I9 s" T: K
error while observer running SET-CURRENT-PLOT+ s8 H- W/ \3 I$ M
called by procedure DO-PLOTS: W: o1 [( e+ x& y0 j2 [5 L% _
called by procedure SETUP: Q: f- T9 K7 _8 x/ k; @; i+ M) J
called by 按钮 'setup'5 S! o! C4 x* Q& L+ ^% n
求大神解答啊 |