我编的程序如下turtles-own [energy]/ f( l( x8 i: u4 K, B$ s& t
to setup( Z3 l) n2 A' d+ Z9 s# }) |" s# J
clear-all
0 `8 ]6 x, }8 h$ O5 ~" J/ t4 R setup-patches
2 ] S) ?# Z4 R/ b% i! {# G, ? create-turtles 100
5 R& r9 z, a: M( F& y' D do-plots
, K p" D8 [5 e; U% g m! ]5 Z ask turtles [ setxy random-xcor random-ycor ]
1 ]6 o( D n+ R( cend' f& h0 k7 T; J- b% }; J: C, D& Y, H- g
to go
' u5 x. A& S {3 [3 Y( |# X move-turtles
) b% X/ F6 H) F a! P' v) v eat-grass4 d+ Y2 N/ y& t$ [
reproduce! d" n4 e' D+ l6 l$ }
check-death$ @7 r o/ ?" |3 O/ p4 B5 F
regrow-grass |: p' P. Z$ e' Y2 l* q
do-plots
* Y! G. k8 x9 v3 gend; q. p$ e' `* G$ a, s
to move-turtles
. E6 ~7 j' e+ v ask turtles [( n, }: M* z E; i
right random 360* j# A# r. [$ N, U, L0 G
forward 17 H3 l( o P. P/ M4 A
set energy energy - 1
6 n( S$ R0 O4 Y6 r/ T ]& Y k2 Z8 }# ]0 F/ ]5 k$ H1 k
end
4 e3 x X/ ~; L9 X* _ A% Kto setup-patches
. C9 ~8 J& K7 `4 F# @% k2 W- R ask patches [ set pcolor green ]; i+ Q# K# x, m6 Q
end
# j( h9 _# R0 @9 A/ @/ n! Qto setup-turtles
$ v5 b6 P/ n! u5 y/ ]& D create-turtles 1000 ?* j* \1 C- `4 d4 p6 ]
ask turtles [ setxy random-xcor random-ycor ]5 \$ J t" v2 n; l. V; p: I
end
! x9 r, B7 w7 L7 U* ~7 i' dto eat-grass
! h8 P/ n$ e G+ P0 S3 `0 M! Q ask turtles [& w! f/ L$ v$ u% z% W/ `; v" m6 m- j
if pcolor = green [; z( L S1 n8 B5 A% u% T
set pcolor black5 p( G8 N9 `, B. G& q
set energy (energy + 10)/ \5 x/ v3 V4 r& C: ^
]
- ]) n# w- o" O7 B2 O0 U2 C& g ifelse show-energy?- @+ q9 k+ [ q0 f2 Y0 C7 E" D: `$ k
[ set label energy ]& S+ ]1 h; ^% G( y1 h- `
[ set label "" ]$ p* l. c& N' u+ S) f7 U
]; E, x0 p# a! b8 X( }: U- K7 r
end8 l* a$ b' b/ _ H7 h& \& |2 V
to reproduce
; P/ @% b( ]5 b ask turtles [8 }1 V. Q' G# h& ]2 J
if energy > 50 [
$ L5 x' K. R/ V) Q5 @! h set energy energy - 50
+ f0 B( r- b" \4 J; G! v' b8 B1 } hatch 1 [ set energy 50 ]7 v1 H6 l7 a- U# b/ j% j
]# Y# f, p% \5 K* K/ Q
]" l- x2 L g z7 Y4 K
end# O5 f0 q1 K7 O. r: g: s6 ^* e
to check-death* G0 ?0 L" R$ |9 i L) H# G
ask turtles [
1 _; s& Q# w+ B if energy <= 0 [ die ]
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end
4 _$ C7 `! J \6 P6 S* ~- S! Tto regrow-grass
5 C$ X. `/ B+ ?6 S, M2 Z ask patches [+ Q' P4 i$ w* j" m- Z" W( j" I0 n
if random 100 < 3 [ set pcolor green ]
8 O& G; y. C+ M$ Y ], Y- L/ q6 X8 f6 B2 ]
end0 C1 \3 T% j- o
to do-plots
6 I: g- u1 N H! T/ W1 z set-current-plot "Totals") ^2 j- C# M& `* q0 G8 `$ ^
set-current-plot-pen "turtles"' k; { ]' H! v( Q1 P2 g
plot count turtles
: F/ d! p7 A4 O( t set-current-plot-pen "grass"
0 \( H, F6 P6 t; ^9 n3 @! r0 L( L plot count patches with [pcolor = green]
2 t. J4 u& g' z( @7 x* Aend
. i! I: ?, I3 Y1 p可是运行时提示no such plot: "Totals"
$ S U$ r2 r& w( K p4 d( a) T3 f3 zerror while observer running SET-CURRENT-PLOT
1 c/ q6 }' ?' R. B2 h+ h3 n called by procedure DO-PLOTS5 y, P2 q7 u# ?; N6 X3 W( d2 q
called by procedure SETUP
6 I0 D; P8 N( o4 x8 e called by 按钮 'setup'7 G' w( I1 ]- S) C$ S, ?4 D* U
求大神解答啊 |