我编的程序如下turtles-own [energy]
: |/ G/ V" K9 Ato setup
( P# M+ B* d6 g3 ] clear-all
" J: o. r2 `$ x$ ~% B1 S. ~, c setup-patches
' F' N/ p8 |4 N, ` create-turtles 100
) W/ K4 A8 }0 Q! } do-plots; e0 b0 L* Q, v8 i
ask turtles [ setxy random-xcor random-ycor ]
' x0 j) J3 U/ P( e) nend5 k) B4 \3 o" u; C# [7 J, [
to go
! T8 [1 U1 C, O" j move-turtles
; a* `( R6 Z' ^9 b2 J eat-grass- r' U$ i' u- Z6 Z: y
reproduce3 r0 a7 O* T% s9 _& R& {
check-death
B2 R9 g! y) R: _' \ regrow-grass' s" b" a ]0 {8 x1 |: h$ C
do-plots: F6 x4 n9 ~# s
end
3 a& o% A3 z7 Q6 u8 Eto move-turtles
0 M }" e, f# ]9 e; f ask turtles [
2 I0 b ]. r' t3 i; E2 d right random 360
6 d4 `( Y. z5 c forward 1
/ w w0 |' F- {; S# L set energy energy - 1# e1 s: L5 o7 I* Q% @
]
6 I8 U/ G& F( Z3 Aend; T# N5 m% ~' U/ [* k- g
to setup-patches
; E& p0 ~: z) M8 T ask patches [ set pcolor green ]7 Y; Q i% t3 _; ~# U
end
8 U$ M; O9 G8 ^/ I% p9 ]3 a& \to setup-turtles
~ [* p0 F8 ?% M: u create-turtles 100
5 B; ~, G( m. e' h9 a ask turtles [ setxy random-xcor random-ycor ]% L0 m" `+ f/ a8 G6 x
end% F# E, E3 }; }# a3 Y8 `
to eat-grass) W9 ~+ g( u0 l% a
ask turtles [4 g3 j7 Q3 ~* u/ w2 _ E: x
if pcolor = green [0 v, m/ ~8 V! e, E
set pcolor black; z5 [5 y1 X/ P: E, d& G! N) P
set energy (energy + 10): m2 f/ h0 x$ V g2 @& d, a
], [: ]" Z, { F, ~0 z
ifelse show-energy?
0 U/ {4 x, O0 i [ set label energy ]) M( k2 v* p5 [2 ]' |. d6 _- H
[ set label "" ]( o6 j k8 T9 R7 j2 K+ o8 h
]
+ I" A8 `- f3 M7 k8 b: lend
! R. {! q% C( Y: b. D) u9 C! D% a" Cto reproduce
4 Q6 A6 q( U# H/ k, U8 f& F ask turtles [( M; l( w3 S9 P- ~
if energy > 50 [; M- I" X3 x4 O; c. r2 T: P
set energy energy - 500 c5 F6 y$ C1 P. U5 ], L
hatch 1 [ set energy 50 ]
( {8 L( W7 e. e- y& @ ]
+ G" H8 p! _6 x ]
( ?- _2 c! R, `4 J6 D% ~end8 L& D4 E9 X- d9 r8 x' |
to check-death
' P2 S" [/ ^) n9 r, p& d! K ask turtles [( _3 I4 h0 f5 E2 U% ?
if energy <= 0 [ die ]
7 O1 N' s$ n8 v" u' H# K ]
7 e$ J4 N% D3 e8 @end
* B& K _4 t5 ~' Uto regrow-grass4 s3 l' L: k7 w6 N b' o
ask patches [
5 n/ ^- ]3 B" t9 K5 w if random 100 < 3 [ set pcolor green ]8 K) W$ g8 g e! u3 y7 k
]
1 }4 U& k* m* h$ j$ @. f9 fend
& P2 U0 b* D* f Cto do-plots8 R! m u2 K' w6 Q4 j& @; f5 t) E
set-current-plot "Totals"* }. K# o e+ {3 s2 F4 t! K1 J
set-current-plot-pen "turtles"1 Y7 H9 T6 z s! r' o1 R3 x
plot count turtles
% z! J' C# u m set-current-plot-pen "grass"$ G" ^, W9 @9 Z( H3 J& K: a
plot count patches with [pcolor = green]
: G1 Y/ c- ^5 n. y' r* P- Dend: S ~- ?0 W3 c
可是运行时提示no such plot: "Totals"/ g' I# M8 n% r
error while observer running SET-CURRENT-PLOT
$ E- a+ a- u( U, ^9 R called by procedure DO-PLOTS
b' ^4 W3 N3 y7 K0 W called by procedure SETUP
1 B8 Z2 m9 E: I called by 按钮 'setup'8 J& P/ T. S; T. P3 O, C/ p
求大神解答啊 |