我编的程序如下turtles-own [energy]! B5 c3 j6 l* }$ ^4 a0 u* f
to setup
8 R' \1 [ A# R- ? clear-all, s: B) l2 u. j. `, J/ G: j, Q
setup-patches
% F! f6 c. ]# h/ \ create-turtles 100
) ^% ^$ h. Y: m1 Y6 J! g, P do-plots. d y8 x2 }* j5 M3 h- P
ask turtles [ setxy random-xcor random-ycor ]: Y M) l) P5 q' ]
end
" z; p/ v. J2 i6 K8 Eto go
; p3 h( m2 F, p4 {- R$ ~1 s8 i7 y move-turtles
$ P7 u/ |( r S( y eat-grass5 p9 J$ W) e- ?% y7 `0 c
reproduce
, v3 v! x% T1 ]" R, x& d check-death1 l% o! j/ @: `
regrow-grass
+ |! w# _# ^( O; L. p# c, { do-plots
x- ?2 A( h5 `( \! k) F- Rend
: s+ l/ J5 f: Z7 i" v1 c' D9 {4 Wto move-turtles
) s5 ~! M3 Q& V" ] ask turtles [$ l( C* `% c' }0 q* K
right random 360/ Y" D% p9 l" b3 f" m
forward 1
3 t0 p/ S8 |, T6 g* {7 ?. d1 ~ set energy energy - 1
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end
1 ] T+ P$ y9 M* B# L- zto setup-patches( E( M- P" @( ^; F L2 L
ask patches [ set pcolor green ]
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to setup-turtles
4 a' H4 M, o1 p0 r& O, d/ A, V0 P: z create-turtles 1002 X5 T, `4 E8 u+ J) k
ask turtles [ setxy random-xcor random-ycor ]5 j4 g/ I4 A4 D% T! }2 F6 _3 k( [
end+ M/ }3 Q: Q9 G% x+ O" g3 C! B! g
to eat-grass" I |5 t( t) \' e g) u# \8 R$ p
ask turtles [) M" X. Q: j+ x+ h0 q
if pcolor = green [
: f& q( I4 f( g8 o4 N" ` set pcolor black8 O& s5 v7 {7 a4 o" ~, d
set energy (energy + 10)) k( R! d3 _. }" ~
]1 Y7 e! f; s# J, {/ N% B
ifelse show-energy?
0 d' P, ~4 [( L& n* Q [ set label energy ]
) e9 k, I* i% M5 z* ^4 F [ set label "" ]/ C/ t, {( H( k
]$ v7 Y& b: f6 D# N( Y7 A
end
% W( _6 _0 J' M" M7 N0 S. b7 ?+ Gto reproduce
1 b8 E9 t0 t' ~2 Z8 g ask turtles [/ a$ b! ?9 {! U6 m5 G9 U
if energy > 50 [; b: F% Z2 Q& H$ n1 X9 U' f: u
set energy energy - 50- x$ x+ U) b$ F
hatch 1 [ set energy 50 ]7 X2 y) J" c9 I9 x4 o- R# l, R
]
$ } k& Y4 e) h4 q/ k ]5 {: F- m! g. C! D# F
end: b; l; \2 K+ ~* x
to check-death
' x0 G) u9 k1 Y9 N I5 m ask turtles [
0 {( z+ [- R9 o( v$ a if energy <= 0 [ die ]
1 y6 _& G: B9 p6 Q ]
" W/ C. J, r% p* }0 e0 p% fend7 _1 ~. L! K+ Z# F! ?
to regrow-grass
& |- Y K% W1 @( X3 O2 L ask patches [
6 T6 I5 `( L/ g0 j; \ if random 100 < 3 [ set pcolor green ]7 m: F* D0 k- G R. h
]
7 W. L# h, `2 E$ u5 D) `end
* f; X! o. p' r8 `# O( K Rto do-plots
9 j& {/ _) x+ u/ ^5 I6 S4 A set-current-plot "Totals"
2 X" q$ U6 h8 F& v8 H2 p set-current-plot-pen "turtles". @% t$ [6 ]4 k2 ~& C
plot count turtles, h5 E9 T" h: C& i
set-current-plot-pen "grass"' M; e. E+ C0 ~+ G$ j: z
plot count patches with [pcolor = green]
! [( W( M0 e- E- ~4 Eend& t1 c' U2 x4 h# K7 z: v* u
可是运行时提示no such plot: "Totals"9 n% L3 Y5 h6 F- U+ G5 X }' D# N) @
error while observer running SET-CURRENT-PLOT
, G. _1 v9 C. b+ H called by procedure DO-PLOTS; V% Z- x7 {; |+ _1 l
called by procedure SETUP
5 u: z8 x4 k9 @- k2 V9 w" a5 ^ p called by 按钮 'setup'
$ P- Q4 @& [2 W, R% @- a! h6 ^# }) K求大神解答啊 |