我编的程序如下turtles-own [energy], i4 u/ y3 Y b& D* ]9 V) p# |$ ?
to setup
2 L# M4 C0 E: w0 M6 r! b0 Z clear-all9 S1 X3 R& x. y8 Q4 j( Z
setup-patches# g- a- _0 ~% F1 t4 I
create-turtles 100+ O$ d, G4 |. K% j" V0 ^; h
do-plots5 p: w5 O1 N4 [ q% k( S) _" T
ask turtles [ setxy random-xcor random-ycor ]
9 I3 C0 C! ^5 l1 @end9 ^( ?( Q, Q9 A6 ]3 E
to go/ u7 s8 I3 c B h
move-turtles
2 K# f8 M: h1 x9 | eat-grass
) B; ?: s/ ~& c0 [, a! t& T reproduce
: I: S/ n- y) q# [ check-death
3 j. ^, W. K. W3 U regrow-grass
7 N% G8 Z9 z7 A4 f: O6 A9 t do-plots& U/ a$ l/ z E2 `* a
end
" X" }. \4 Q/ W3 uto move-turtles9 V+ ^: E) K, P& x1 c
ask turtles [5 j0 O/ e5 G2 s" \
right random 360" ]: Y# a% \9 \) G" A4 F' Y, Y. u/ t+ z
forward 1/ U% O" c7 r* D% Q" S9 s
set energy energy - 1
$ P& |0 Q2 P- }; t( l) k ]/ O1 }8 p# A& i& C) m+ ?
end
" a- i0 w9 W' p' l! ^ F% pto setup-patches+ v+ T( u3 o/ N+ W) h/ U' L
ask patches [ set pcolor green ]
2 o: C: E3 T! `" D# }end6 B1 O+ u8 f8 u7 Z% q3 _
to setup-turtles) a. n. G: Y0 A) P Z
create-turtles 100
0 s! E7 v. \& i0 L; | ask turtles [ setxy random-xcor random-ycor ]
( R2 |0 B5 {9 l$ Yend
# d8 E, g: D* L2 uto eat-grass* H3 r( N! e; K5 j% W$ R
ask turtles [ ~5 V7 ]" ~8 x7 ?
if pcolor = green [
* P7 p* U8 ?3 f1 J8 v( Q7 V set pcolor black0 d8 G" ~* r3 t/ v
set energy (energy + 10)
" p& S E$ a6 c, l1 R7 g2 ] ]
) p; r6 b8 S- v8 p1 G4 J9 r( q, T ifelse show-energy?
) C7 s* J* ?. O' c; S [ set label energy ]
* ^' f3 ?$ q; ^ [ set label "" ]
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end
. A0 O: U, [# U" m) m; {to reproduce
! \2 S$ J" x* c- u ask turtles [2 L1 m) q. @. N; L2 b6 E8 S
if energy > 50 [# [: ]! K: b% r( P2 b( v# s
set energy energy - 50' f* q+ J+ u' s; J
hatch 1 [ set energy 50 ]( E8 S( T; B! R& Q7 n% m( N
]
' K5 J5 C! v" E! h' a( A ]
7 V) Z7 J" j+ Z% Send
% i2 ?/ H( J) ^, s) Zto check-death
: T6 m: C$ K6 V# ]3 J- ?) ^ ask turtles [# `5 G& v5 `: l* r' G( D: C8 t, L
if energy <= 0 [ die ]
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end
4 W8 R7 f7 D0 ~7 j- Lto regrow-grass8 g2 S% Y, n3 E$ i; D+ ]
ask patches [
7 A/ }. ]9 C5 w" G if random 100 < 3 [ set pcolor green ]
' o2 R+ W0 C6 V" a* g- R8 ^) x ]
' I9 y: o6 @; Xend8 |2 Y' D! T# d. ]. W+ ~
to do-plots$ S( {' m# Q7 C0 u* n5 e2 q
set-current-plot "Totals"' \ s( i3 [3 T4 `" P1 J
set-current-plot-pen "turtles"
% u8 g; h1 C4 M J) s" L( U+ W plot count turtles
2 w) `" l0 {) m( @0 ?3 d* E set-current-plot-pen "grass"- n) j% j4 {5 @% Q
plot count patches with [pcolor = green]* H2 \/ f! |0 E3 [5 l7 P
end: @8 s6 b7 \: k! E
可是运行时提示no such plot: "Totals"
9 ]5 G4 x3 j3 Zerror while observer running SET-CURRENT-PLOT+ K: b9 \/ v4 D$ T1 N5 W
called by procedure DO-PLOTS
+ @7 Y! {* i6 Z2 N# F3 ]6 s called by procedure SETUP
' i2 g3 D1 r1 c( j" R2 l0 M$ k called by 按钮 'setup', @5 F( L8 ^/ p9 a- t3 f. E
求大神解答啊 |