我编的程序如下turtles-own [energy]8 R8 U# c, E3 K. W d
to setup
6 u$ P0 s2 K- M# L8 h' q clear-all
' W: P$ j! Z4 e4 I3 R, T setup-patches% c Z, Z" F8 T7 w( {* x7 K6 Q
create-turtles 100) V- l! y& N: o* ^( q9 K
do-plots
5 {% O; w0 K e" U- g+ k ask turtles [ setxy random-xcor random-ycor ]) R# L5 o5 y% O( d {* _$ m2 I
end5 m; U* p8 c. @8 D7 H
to go' Q" e( d p2 b f6 T# Y Q
move-turtles Q! s/ N& ]7 ? {: S3 f2 i) x0 H7 q
eat-grass
' X, X; t2 U; W: s reproduce
- n' {) ^/ M! | check-death) Y" T. a+ o$ V4 j! L
regrow-grass
2 E- l' v* M. n" t do-plots/ E3 t+ i0 t: N# j
end; B7 N( e8 r' y% ?* a* F6 g
to move-turtles
0 E: N! p+ e0 W- q C: }/ d$ \( W# k ask turtles [
. |5 u8 O- c* M( T: j5 T& T8 ~, J# [ right random 360
2 k5 j+ b4 w* @ forward 10 ~- }) p* t, ^' [/ K
set energy energy - 13 c, p4 S1 o t) a; d8 l
]
7 W2 E" l9 [9 j$ ~9 K1 x( [" u, s1 @end4 ^+ n5 G$ Q2 k. R: t3 n
to setup-patches2 Z+ X4 m6 ]( A k0 u1 B& @
ask patches [ set pcolor green ]
1 S+ E+ R( W6 I2 J( }5 M( Kend
' p; K9 B) z7 V! M! y; x/ Cto setup-turtles
% D$ d8 A8 d' o; j1 P! F* B create-turtles 100
& n9 E2 G j( ~0 ^) o/ d ask turtles [ setxy random-xcor random-ycor ]
# c; n, u4 l s' x) ^6 C! ~end
0 ^5 f$ P8 C9 T: W2 V1 M: T- O2 ^to eat-grass
[+ o/ D7 Q0 @/ L9 e ask turtles [
- K7 a) m' a% I: S' G0 Z: w( v if pcolor = green [
6 G% i2 h w2 C. E/ g2 A% |8 s$ O5 O set pcolor black# s G' F9 [5 s" F0 B* Z/ H n
set energy (energy + 10)
" Z6 `2 ^1 a( W ]
3 T; ?- Z# i- g' _0 S% ] ifelse show-energy?
7 M" _: h0 Q9 z1 ]9 n) k [ set label energy ]5 N# ]2 g1 ^7 i
[ set label "" ]
# `* n7 u1 H0 [5 i+ t; B ]
: f* r/ L1 p$ yend
4 x# J* L. ?) I$ T P; [5 j/ J q' eto reproduce
2 a( m6 T; A h" ]% Z ask turtles [; a' P& h: f# e Z! z$ \5 K$ A7 j
if energy > 50 [4 S1 N% t, r" D* {
set energy energy - 50. C; b! e; h# M, `0 C
hatch 1 [ set energy 50 ]$ q4 n! S6 Z" j. K! L" W) o
]1 A1 w2 N8 m0 B, H
]
3 K; i. H2 a3 x0 Y: qend
$ L& a: b2 |# ]( i7 r8 Oto check-death
- k' P* Z3 t! z" m% E# [& p* C: @ C ask turtles [% m$ A I! L& T9 F
if energy <= 0 [ die ]
( q g, n6 T/ ` ]
+ z: Q8 C0 w! Kend7 Z0 u u' i" P- Z
to regrow-grass5 S0 Z- h3 l& Y9 [. z" Q- {5 Z: Q
ask patches [
) W' ^8 f. V4 @, x" N G* F( a: z if random 100 < 3 [ set pcolor green ]3 O9 F7 a% Q- B+ w [8 W) H# E
]
3 ~8 X/ X3 j2 B5 T( _, {end
! `3 J5 q" f/ R7 S0 ]1 H8 pto do-plots6 s; f1 u) \" J2 g" _$ v+ B8 }+ ~: p
set-current-plot "Totals"
4 `' E/ a& U, c( Y3 h! N- `; o set-current-plot-pen "turtles", R5 b) j8 ]2 ]# H
plot count turtles
! Y1 C1 J6 ^& X, o( ^+ A+ C$ Z8 r set-current-plot-pen "grass"- `, x4 X& z c/ Y* j; @# d* F7 z
plot count patches with [pcolor = green]
- Q- c/ V/ m( C+ a0 Hend
" z4 V6 M4 U) @$ _, G& }可是运行时提示no such plot: "Totals"
5 X8 k, d. l( _3 }& Q: ?# x" u/ s) @error while observer running SET-CURRENT-PLOT/ M0 t, O" n& m
called by procedure DO-PLOTS
! s% E% F) u& U! s: b/ p) G called by procedure SETUP' @. p# f Q# ^- L% d; o8 T7 R2 D
called by 按钮 'setup'% s& N d% ]! R5 U6 `) W' e
求大神解答啊 |