我编的程序如下turtles-own [energy]
9 R7 n( s G3 s, E0 m0 \4 ato setup
; W- Q% ~# X# c- l5 X6 o! d clear-all
. [1 j% }% O) H1 } setup-patches/ A+ e, }! ^. @1 e
create-turtles 100
/ a0 y9 N. I& ~8 \ h do-plots
8 V0 f' N, L" W1 w ask turtles [ setxy random-xcor random-ycor ]0 r( j1 |" t# B; m
end. ]. u7 `2 D5 x9 ~+ W
to go, R; z. r( R# \( S. `/ D( L8 |7 d8 v
move-turtles+ x4 f. i( L! p/ a6 a9 o
eat-grass
+ V+ ~3 j& l6 V5 }8 Y8 O) `" i reproduce
) t3 Q* P& Q9 e4 K# z check-death
: \# U; `3 G/ L6 p regrow-grass- r# b$ Z+ W* D
do-plots
7 g; F% k1 A* S6 |- [end
4 X+ S5 D+ n9 v5 t4 @to move-turtles
% ?4 ~' ?: [9 o0 Y ask turtles [$ U, `, i1 J- f8 B* D
right random 360
2 p) _. R5 f2 i3 E! ^1 X7 j forward 1) f0 d x7 C! s+ o0 L t
set energy energy - 1
8 e0 |' j0 `# J& r1 s0 |) k" K ]/ H7 ]" Y7 e& k! B. n
end3 `9 H& L, r$ h; b
to setup-patches
$ i% B! T$ l4 V" I6 h2 ^, y ask patches [ set pcolor green ]
5 S; F7 _6 H- s( c) z& gend# u1 ?5 B6 Q# A+ e
to setup-turtles
2 H o3 J% U* j( |# `4 n create-turtles 1005 q" p! \0 ~9 T0 a- Z7 t' v
ask turtles [ setxy random-xcor random-ycor ]
! l* ], G' g$ p) {; @end
7 z' O; b! h! z: g$ kto eat-grass7 k; d: k" v" L' k2 `
ask turtles [
" ]# L7 T9 B, A/ w8 ] if pcolor = green [( h ?) I2 y7 ^% `; ^
set pcolor black+ @" D* x! |; ]
set energy (energy + 10); U& n6 C0 G. O4 Z
]# A$ `# J6 s) B
ifelse show-energy?+ Z5 C" Y' T! Z
[ set label energy ]# ?/ b+ c& t; i; c/ n" z1 y0 Y
[ set label "" ]9 J# \, J- |- K, o* [" ?$ G M! I
]
: h+ Z# j. m1 X, n. U, l+ Q+ ^& Kend
9 @/ Y8 F, O6 fto reproduce5 A, S9 u4 d( T
ask turtles [
- b+ o. j% b: x% `: a8 B if energy > 50 [
/ V7 ^6 u/ k, m- D7 M set energy energy - 504 c1 c0 g: X. b1 w6 z) G) ~
hatch 1 [ set energy 50 ]
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]9 L' a t3 N3 f9 ?/ A9 R: R0 _
end7 f7 `- T z5 o/ y' d# D) d
to check-death$ |1 M5 K6 b% L* M0 C6 c6 }: h
ask turtles [
+ ?; B* ^3 {0 q9 e: a& o if energy <= 0 [ die ]
. B7 M" N( V2 A! g ]
: k5 d; ~. J# B7 m* n5 Mend
0 X8 y+ Z% f. ]: w+ pto regrow-grass' g" D% J$ K; c
ask patches [6 \% D4 M) q5 X) c. j4 q3 i
if random 100 < 3 [ set pcolor green ]/ u' M+ @- a$ P' e) Q
]
/ Y# u& ?0 N. M. Qend! J) s, q9 t) J
to do-plots- g8 j0 Q9 _& Z$ a
set-current-plot "Totals") X6 L; n: X0 L: }
set-current-plot-pen "turtles"" b& s3 ~8 B/ A; k# h; [
plot count turtles, K( a" l3 p9 ?0 A! n+ D x( G
set-current-plot-pen "grass"
! m1 ^/ ~* y) X- g plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"/ y6 {1 t1 y! s7 R
error while observer running SET-CURRENT-PLOT" [! L' L/ J& ]: e4 ?9 z2 Z
called by procedure DO-PLOTS
; z4 b( g/ j6 G called by procedure SETUP; x% P$ V- Z4 i' R
called by 按钮 'setup') Z* t7 w1 S" t0 ], c
求大神解答啊 |