我编的程序如下turtles-own [energy]
! I0 U; f L. t; `to setup
! r6 n& C) d* s clear-all
/ L1 Y7 `' X$ o+ f7 F0 ] setup-patches
8 R& B+ [; c5 C W* n create-turtles 1007 X* F# }6 U* F- U+ h" ~
do-plots0 d5 w+ S+ F* E2 d0 M8 k5 A
ask turtles [ setxy random-xcor random-ycor ]* F, t4 \1 n& o( \" T
end+ }9 |5 e1 R1 p
to go( Z; }8 O+ W1 |: v- _0 J1 i
move-turtles
: @& N* u& o; X1 O; g eat-grass
% B0 c; R0 Z* o' X, e- v" y; Z: u reproduce
5 K7 S# {' o& D1 n2 T* A check-death
7 ~" u$ o2 E0 a( r! w regrow-grass5 l" ?6 H) B5 e3 b5 C9 L8 X5 P- [
do-plots
7 J3 t( l& c' [- k) b# v" _end( N. n& P( y" z6 m/ ]* |; H
to move-turtles; {' k' {! D7 Z9 [+ v
ask turtles [& G. J$ ^9 P2 a! t9 i0 t
right random 360
+ x7 w; x, X4 T: a forward 1, Z) M9 o5 h* X* v, X2 e' T
set energy energy - 1
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end
: a# U, Z1 B5 n! [- W$ [: c6 Vto setup-patches
6 E+ \2 ?3 R' ~$ g( y ask patches [ set pcolor green ]) r; G" p" v+ Q0 V- N& G1 a0 g$ V
end2 v( ~7 i( ^( S. _6 ~: l' C
to setup-turtles
m$ g/ l1 i, l4 s create-turtles 100& F) j. |. ?" J7 S7 C1 U
ask turtles [ setxy random-xcor random-ycor ]* O. n$ o5 M8 \0 K! f8 z& J* g+ n1 k% W
end
) [6 B7 ~- Q0 A/ Q- mto eat-grass" w0 y$ e' h3 R7 n. _- [
ask turtles [
( K! M; ~& {3 T if pcolor = green [1 U# F$ M+ L% R: h+ c) S
set pcolor black% a- c6 L2 O3 J @9 G
set energy (energy + 10)4 g9 E- v p2 ]6 [9 e7 C
]
" b5 }4 M8 r: i8 |0 ?3 s* p ifelse show-energy?7 L" l& W" J& n1 e# D
[ set label energy ]1 \' l7 m) G( J7 x/ p9 O6 { W8 g
[ set label "" ]) h& F% S5 @. o( L _& B6 A
]+ G- L8 r9 M8 m: Z3 q5 Z( K
end& Q6 H. V+ s7 Z1 n& J' S
to reproduce
2 a9 t" y. q* m: \1 n6 A ask turtles [' p) b! W" ]" _+ \5 p
if energy > 50 [: S( D2 C. F# T B* e
set energy energy - 508 O% e' C: @! l" i/ \. R# j
hatch 1 [ set energy 50 ]" \# p# ]# x7 H7 {
]
$ N$ E6 c k2 d5 h. w; Q: K. f* {- B7 E ]
$ c& F* ?& H G r& i, Y5 g3 h+ v. |end
7 C/ V" S* p: C0 J6 W e3 Sto check-death8 {; b. l5 {1 P; ]. n# @
ask turtles [
- p1 {; g0 n4 K8 m; j0 m. | if energy <= 0 [ die ]
# ?" W: {- ]$ a6 f! m ]
; l* a/ D% R3 J* W3 Rend
! ^9 \6 O1 ~# Ato regrow-grass. T; x/ G4 ~5 F9 `, ^
ask patches [- L, o2 o' T, ]0 \% ^+ Z6 N
if random 100 < 3 [ set pcolor green ]- x; O- W6 j5 A/ y$ Q3 R& ]6 V
]3 G& t" ?2 U. B& G" g q" @
end
" w6 j* x) f' J/ v* C# N% Mto do-plots
, j+ h* A4 J) ]9 b' c# B7 m- A6 _: o1 R: _- m set-current-plot "Totals"0 N+ \' N) _& _1 l$ ^6 N
set-current-plot-pen "turtles"% |* ]- C- ^7 K' l& V7 v) T
plot count turtles
6 Q. z+ J M- N4 ~6 V# e# y2 S set-current-plot-pen "grass"; k1 v# T, Y$ C3 h3 r
plot count patches with [pcolor = green]
1 g1 w0 |1 F; |. @end2 F i d; c$ x' h0 n" \# O
可是运行时提示no such plot: "Totals"
. J; X0 Q) N3 t' s" Y. X$ Derror while observer running SET-CURRENT-PLOT* M5 H; J. w: a6 ~0 r( z/ J
called by procedure DO-PLOTS, I8 n& l1 y0 v9 `- Z; m: a
called by procedure SETUP. [+ k, t0 Z& L: A) C' m
called by 按钮 'setup'
) R5 x% @$ h( H2 T7 o+ G7 `# a求大神解答啊 |