我编的程序如下turtles-own [energy]5 Q" U3 ?/ y; l7 V
to setup' n3 r8 O9 |- @, P3 A) r; c
clear-all& Z( y4 N1 S* k3 O' ?. {: n" `/ b
setup-patches' A, Z: b2 D) ?, `8 H
create-turtles 100 S# Z% \# j8 I8 r1 }6 M
do-plots
: \# S1 H8 p0 u ask turtles [ setxy random-xcor random-ycor ]. {# {, |2 ^7 S- w1 t( u& w
end
9 _+ j+ M- j0 B6 P6 Z9 `2 B, Ito go
" b4 l, `* Y. w# ^& g2 Q move-turtles% }% ?/ K# ~% k) f O
eat-grass
$ y' t( s0 V% `7 @: j, v% N reproduce# O$ @! T+ }6 \! _( ]' C
check-death# M7 _ o' S7 g; `4 I W6 w" \ q
regrow-grass
# z; \' d! `, r+ Q; U+ P3 X, Y$ b do-plots
& Z1 I/ t7 L9 |- }/ Qend, s, u! n' p; X* l: ~* [
to move-turtles% G0 C" z5 k6 h6 d8 a2 O
ask turtles [
7 u6 e. }- @6 X5 M9 g right random 360
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set energy energy - 1
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end l) t, D' [9 W e5 ^
to setup-patches- h9 S0 B0 {0 [: j2 W
ask patches [ set pcolor green ]
: O$ ~* ]! ~6 mend
) q3 y+ b% r) V9 m" ^2 G* mto setup-turtles- ?! t$ s! D2 z. B$ p) p/ S& V8 T# O
create-turtles 100
6 {) o8 r4 n5 g* l$ p j% h' e ask turtles [ setxy random-xcor random-ycor ]
+ }& z% g" b# d# ?0 Tend
; z. D% y' W, @* b4 m3 jto eat-grass
0 J! @/ ~' p* u( |$ E' p' G$ S9 \0 z ask turtles [
! H6 K" N2 G& T! W if pcolor = green [
( ?+ k1 s/ q2 ?; d, @& w3 w: s4 a set pcolor black
' F% X7 R( b. I* \# R5 r set energy (energy + 10)4 ]- E8 E s- h# G! R0 ^
]- X* E& r3 ~2 t% p. e
ifelse show-energy?$ l2 V6 V4 D$ c- O
[ set label energy ]
# T2 H$ A' S+ D. \! J6 g [ set label "" ]& I$ P& [' H- x; P: s6 s
]$ N' R, X( m* L" ?8 ?7 j/ x, [
end
* `2 |7 x- `5 L- z1 c* M7 ~1 kto reproduce% [& j% X: ^* E% c
ask turtles [
6 w# E9 g$ w1 B3 ?9 P! I' P if energy > 50 [
0 R9 C. G$ L f1 p; i% f% \ set energy energy - 50! R/ k: J0 I. W& o$ q( x5 A
hatch 1 [ set energy 50 ]
1 ~4 \: U6 A2 B+ ?2 N' u ]( {. f2 @$ Q/ i6 Z) G
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end
! r: @& q; t& q" d) Q8 p3 }& P @to check-death6 y9 o5 U8 U7 a/ B( P4 x4 N% V
ask turtles [
* t* ?, {5 H( X/ _/ x T2 T if energy <= 0 [ die ]
! m4 `) L7 b3 d$ s) [" { ]
+ q0 q+ |5 q/ Z7 F2 [3 gend1 t f% y" n& m8 i% Q
to regrow-grass2 p v- ^% K2 U1 w1 k
ask patches [# P2 _( i" A% O! e( G0 `, ^$ Z
if random 100 < 3 [ set pcolor green ]
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end4 T$ [" H- D, } D( I/ _- H: q5 u; B
to do-plots
: J5 L: M* S# l, p3 G set-current-plot "Totals"
; Z6 E1 P4 r2 i f! ?( ^. z set-current-plot-pen "turtles"7 ~- z0 `# R! d8 n
plot count turtles! O B; C5 u( E) D; _/ k
set-current-plot-pen "grass"0 D! ^& @- x4 u4 x7 E
plot count patches with [pcolor = green] W+ a d; A8 i0 A0 }" X+ S
end- i' |3 y' D. X$ e* `2 p+ ~9 c; Y
可是运行时提示no such plot: "Totals"
& N+ @+ h7 d4 i9 Xerror while observer running SET-CURRENT-PLOT
7 f0 D: ?5 z U9 w; L5 I* P& E- O called by procedure DO-PLOTS
* S. [; O) E6 e called by procedure SETUP
$ ?& D1 L& C0 A: d8 l2 S called by 按钮 'setup'+ G8 k- r% _! r3 i
求大神解答啊 |