我编的程序如下turtles-own [energy]
* x- R+ {7 y: d( Z- `$ sto setup
% \* v+ B: F6 I' r% J clear-all
6 @/ S/ \0 V: Q( E# f/ X setup-patches
9 `$ r) [; ~, G/ w2 p create-turtles 100
! A! j0 E( \6 W) _" V7 H, m do-plots
4 q/ L, _. C k. V/ G* n V2 B ask turtles [ setxy random-xcor random-ycor ]6 ]$ }' w# I$ H7 w% n! h/ m
end
2 Q, W5 o& Z. yto go+ b% Y: |- R( u4 {
move-turtles
0 J: Q5 u9 X7 s% z; F eat-grass: ^) I: s# r0 k2 K( k/ k
reproduce9 _' [9 q; l) I% o/ ]* b. z' ?
check-death
7 B* c6 g4 m# m! @1 r regrow-grass
5 g! }: T* x$ {0 C6 [) Y3 x do-plots ~0 \4 B4 w) s+ I) |* s. d* e3 a, q
end! }4 |4 B( |- c- z# S* E
to move-turtles7 |, [1 z% H7 a" d( ~
ask turtles [
m- J g7 w7 E right random 360+ P( C2 Z/ ?+ V" e
forward 1+ Q0 ?8 `+ X0 o
set energy energy - 1! k/ W$ V3 D, L8 w
]. G/ g! m2 ^3 ?
end
3 `8 U! O, A3 |, z7 X5 ?1 Qto setup-patches; ?9 R- E" V' y3 m" F7 \
ask patches [ set pcolor green ]8 ^+ C/ m a/ o$ _
end5 h: L6 E3 ~! e% P: M7 t' s% Q
to setup-turtles5 t, S" C3 H# L# n+ g
create-turtles 100, R4 ]" _- g& P3 f
ask turtles [ setxy random-xcor random-ycor ]
5 G) P. K7 A Xend
. A* p R" a' x) N0 E' [to eat-grass
+ S1 ~( }9 R* x' g5 M ask turtles [
( W, i; [& d6 V4 a; ` if pcolor = green [6 Q9 l& x2 }3 m6 D3 p
set pcolor black' w3 \/ U! C% F( C: q
set energy (energy + 10)- P( o% D0 p; ^& z
]
& _/ d% g( k8 i4 V8 D4 K ifelse show-energy?! E' z! m7 ^+ V9 a; J
[ set label energy ]
- w4 L' R$ a7 O% W2 e6 H: ?" T5 y0 z [ set label "" ]- C9 V3 j6 J- E6 \1 _5 T" ^- A
]
; x& N: b1 w6 y! K7 G4 @end8 N L- T. e9 Z0 s- s* s
to reproduce0 M- Y9 b7 t/ X+ Y, P: q
ask turtles [
2 Y& N2 H Z0 A, } if energy > 50 [6 c! H! K* V5 A, ?" R* i$ x
set energy energy - 50
0 L2 c L! X. J8 d; O hatch 1 [ set energy 50 ]
+ P2 x1 Y( Y# a2 q6 R) }4 `8 ~ ]+ z' t f0 f. K' D$ ~
]+ M0 l; j" A( n+ E
end
, e* t; [/ q5 J6 Z/ Tto check-death% I& {- K) \# d5 e( J- R. Q
ask turtles [- O+ A8 I: ~# l8 ]
if energy <= 0 [ die ]
; R4 z" ]# p* x6 W& { ]* S6 ]# l. I- A' W
end3 F) }3 }. _- @/ w" h
to regrow-grass
1 S2 r0 i) p. D- ?* C' V8 A ask patches [% v0 p" A- b1 ? L$ P* i
if random 100 < 3 [ set pcolor green ]/ Q- Y8 _1 m# C9 R% D
]# ?6 [: ?5 f/ |7 {& T
end' }2 q% P8 z2 ~0 T
to do-plots1 k: v% Z- B! S0 @6 m
set-current-plot "Totals") ^% w+ ~1 G7 O t
set-current-plot-pen "turtles"
( `' m& Y* O8 d1 z, n) h6 Q5 h plot count turtles
% r& z( o' ~0 ?' q: {' b4 c; i* m set-current-plot-pen "grass"
" G }: g4 M+ Y! e plot count patches with [pcolor = green] O7 x! Y* G; A+ \6 Y8 i+ B
end4 }( X/ I" x o7 U& A" Y5 \( N
可是运行时提示no such plot: "Totals"3 k2 j7 g5 D6 Y" n, j
error while observer running SET-CURRENT-PLOT
4 d2 ~3 L- o9 l1 E6 }4 N called by procedure DO-PLOTS9 F3 z, X# }5 d# A0 P$ e5 k# _
called by procedure SETUP
' R5 V! u0 A8 |% X called by 按钮 'setup'1 D; u8 B7 I+ d9 b
求大神解答啊 |