我编的程序如下turtles-own [energy]1 K6 s3 p4 t2 a: v
to setup
( c0 ]2 u2 w. I1 \0 G( N clear-all
, K4 J; G2 d1 E7 Q' X setup-patches, s& j' F5 Z! l6 ]* B( I
create-turtles 100
, T% H @1 r/ k9 a4 @ do-plots
. g- N0 m# {# e/ X) b ask turtles [ setxy random-xcor random-ycor ]
7 @6 z& [8 C" Xend/ `9 k- _- }1 Q5 T' o9 I$ I- V
to go
4 v0 `( @; x5 K3 |& S move-turtles4 u0 g$ R. k: t5 D3 s' ?
eat-grass6 X1 D- }$ f1 Y9 z0 r, k. }& z7 p
reproduce6 W, ?" v) M, _' k- M. e* I
check-death. f$ s7 j* z1 i; E
regrow-grass9 E- _% b3 G: I5 C( Q" B5 y1 h
do-plots
" x% w) N8 H, p+ c1 r' a* Qend
$ F4 H* i k/ i" o9 ~4 Bto move-turtles
, E- |3 Q+ |7 W3 \9 d- r ask turtles [
4 S, C4 x: T X6 z/ B ^ right random 3605 l3 `. V% Y A& J
forward 1
0 [5 A. f; j9 U8 e set energy energy - 10 Y% Y3 X5 K& N5 o5 G
]
4 Y# ]5 _" Z- J8 y1 Y4 n7 Tend
2 K W: L% u/ Y H \- zto setup-patches
) ~4 o) q/ O) u5 T/ {' L ask patches [ set pcolor green ]7 Y* x$ g B0 J# ?% ]. b
end
6 w3 O" w& i/ B2 S. cto setup-turtles, f; m* Q" Z! u
create-turtles 100
( g0 G% m! |2 A h) t6 o0 q ask turtles [ setxy random-xcor random-ycor ]# }: f: x; r% } z0 w5 u8 w' i
end5 k0 v E8 j! h. ?
to eat-grass" _! g5 Z, y5 d. V8 d. |" G2 U$ ?
ask turtles [8 T$ p" K! ?" S7 A1 {/ ?
if pcolor = green [: C% I, A$ p. P& j S
set pcolor black% i6 A; V. l ? _1 L
set energy (energy + 10)) T( h8 g1 G5 G7 P
]
6 |0 f0 E, {9 ^7 W; m- M4 j ifelse show-energy?
8 w: p3 ~- C" Z) h- [' H/ P3 v [ set label energy ]
6 z5 Y, \! H' k5 G- q' a) x [ set label "" ]/ c1 Z' p9 M( m8 u$ N% D
], K$ h0 Y2 [! O* \3 T1 s. x
end, k6 {$ O7 m0 l# o7 t
to reproduce4 q0 z! G7 ? @! f
ask turtles [% W( G" ^5 D9 K0 r
if energy > 50 [
2 i$ h% ~* C4 Q: m, R" A& ` set energy energy - 507 ^5 K$ S" \* ~* y: F
hatch 1 [ set energy 50 ]
& L# L1 c7 J& p ]
5 |) f5 o/ z3 M9 t# I ]1 k$ f1 n. v, Y$ P H( F, R( r% q7 t
end
0 m1 `) B' t) m" m9 ^+ ^% Mto check-death
+ \$ j2 T! [& C4 @8 U ask turtles [
3 d, v' \) A9 M$ Z if energy <= 0 [ die ]$ m G! N3 j! v5 o+ d7 s
]
! r7 B1 o' q6 S. U# c' {end
" j/ E# `+ u* X1 l/ ^( D: Tto regrow-grass I& u8 X* Z7 W
ask patches [
5 X& N* k& w. X if random 100 < 3 [ set pcolor green ]" l' g+ r7 `9 g( i+ X. a* r6 h
]: `8 B: m1 Z& l) e
end8 K9 G" g2 ^; R4 w% Q+ C; J$ a ^
to do-plots
8 T" i( w/ j$ e set-current-plot "Totals"
, U+ Z; L5 c3 X0 ~/ X set-current-plot-pen "turtles"
6 j' m" @- m. Z: f8 ` plot count turtles! W2 T" |4 b) \9 j3 e
set-current-plot-pen "grass"
# s9 d# O- l2 l1 Y4 |3 r: o0 D- p plot count patches with [pcolor = green]
; Q5 L, L d5 {0 y7 Dend
6 j" g. M6 m; T0 f可是运行时提示no such plot: "Totals"% @3 ^) V% a8 e8 h
error while observer running SET-CURRENT-PLOT
& s9 K1 ^5 T1 t called by procedure DO-PLOTS
& V7 O' U: d3 s* w3 C. X called by procedure SETUP, b* d$ ~5 z/ `; j. O5 N
called by 按钮 'setup'
2 m) `# D1 k+ J2 E$ f( d求大神解答啊 |