我编的程序如下turtles-own [energy]
# e: a1 l; C' [( ato setup8 e8 R$ T; E4 g3 t' a
clear-all
5 m4 d7 t# h. Z; ~ setup-patches" p* p9 n2 w) O* Q# X! k
create-turtles 100
9 Y' E% J( T. C, y+ C do-plots+ V8 K. ~& m6 Q4 i1 p# ]
ask turtles [ setxy random-xcor random-ycor ]6 F3 Z4 Q% f4 i" Z
end
" N- g0 y( X! Y% O- e8 {" Ito go
$ w1 T2 B% L4 G# W; }! u* D move-turtles7 L: d& t z& w, N/ r: O7 S0 _
eat-grass
0 ^, I J; u8 A3 t& E) e reproduce
7 k: u2 @/ M1 m6 Z check-death
1 j) _" p' W0 s& |) `, L# N- p regrow-grass
, ^) P9 B2 A) Q* {# E7 p do-plots
1 B* U" L: }% K1 K. [! Eend
1 t8 m( ^- k' G$ Tto move-turtles
* O B! u) d5 s3 f ask turtles [
! i! B% A; A& i0 l9 }8 l right random 360; z, y8 t6 P# w2 ]
forward 1
' l% z, {& ~& X- d, v* k' ]4 u set energy energy - 1 f4 E- {! `! Z* _' N
]
( W8 i$ R/ U' g* [7 U k6 F" rend
6 | P5 g$ e, Nto setup-patches" L! s$ F1 Q Q% K6 d( j ]6 M' b3 d! O3 A
ask patches [ set pcolor green ]; i: V1 n. H" i% P) b
end% A5 s4 m: Q: d
to setup-turtles
r) S8 b7 r4 `0 i create-turtles 100, \( b m. @" Y8 V4 Y9 H& n
ask turtles [ setxy random-xcor random-ycor ]
5 o: a* K+ r4 Y* \: k" Y9 kend
( k1 B# L- j7 z; V# ?' u0 qto eat-grass q, x* [ W; L
ask turtles [
5 ]. d/ }. D% b! P3 i if pcolor = green [
$ i4 q+ T9 _1 q# F% q set pcolor black4 _0 ?. b1 r2 c4 y8 J" d
set energy (energy + 10)
; b% k% m8 }2 z ]7 `% E5 c1 y' E4 t0 r
ifelse show-energy?
4 x5 E: U+ y8 V& r [ set label energy ]
. J* e3 E) t+ T; T. K ]. u [ set label "" ]
3 n: N7 W9 G4 ~3 f# H: ^: s1 ^; v g ]
- h( A: r7 D2 |end4 R" E$ C( _7 W. e. R
to reproduce3 x. A3 x- ]7 |$ ?0 m1 Z0 L9 Q/ g8 C
ask turtles [
" c: `; y% F# L k if energy > 50 [9 V8 Q/ {% V! {8 ?' s. n, D+ `8 ], D! q
set energy energy - 50
" ~5 B0 G' \% ~+ s' ? hatch 1 [ set energy 50 ], Z' ~! A& m8 k0 ~8 ~/ Y6 `4 C
]
8 v1 X# i- Y9 @* d4 n" A( e5 D ]# m {2 f! }- D: s' c- y) V
end
0 X9 C4 o0 D# T) f5 ]to check-death
3 t6 D) r& x1 ^* `. R! ] ask turtles [9 H! ?. o4 @7 s
if energy <= 0 [ die ]
1 a. {& q0 @* r& A ], h# o- c8 q. r
end$ K8 `- Y6 x7 i: U
to regrow-grass8 H& v6 C. y1 }$ P/ G6 Y7 d
ask patches [
; [ W; c$ v: [ D& ~9 ^) b if random 100 < 3 [ set pcolor green ]5 \8 T3 j O: w! G& J
]
( s& x* g! \+ o. S2 E/ \6 p/ Z. pend
$ @' N) D4 o3 e* ]to do-plots& X+ h4 ~# n, [. z6 p, `& X+ p
set-current-plot "Totals"% x- a' N! ]3 t- z, h }
set-current-plot-pen "turtles"
# r1 j, H; j8 _ plot count turtles
, j# C( a! B0 k, B set-current-plot-pen "grass"
0 V( }5 l, w# J' ? plot count patches with [pcolor = green]
/ b* F0 g$ A2 w5 v3 lend
9 M9 \& T* i. ~* }: U% r可是运行时提示no such plot: "Totals"5 a" g. |2 ]8 o" n
error while observer running SET-CURRENT-PLOT
$ Y! f. P" C2 a8 J+ O! I7 n called by procedure DO-PLOTS
1 s( d" J% J4 t+ O8 }/ o called by procedure SETUP
7 K6 w. u) S/ n; z* {; ` called by 按钮 'setup'& ?4 j, p2 F+ u% |5 ^9 s
求大神解答啊 |