我编的程序如下turtles-own [energy]1 U1 `8 \2 Z9 m8 R' V q
to setup
. h; W" B/ G+ m9 x+ Q* { clear-all" h6 x# b" [8 B! o8 [
setup-patches$ Z L+ R, I3 Y8 U3 o( O( L
create-turtles 1001 k& a6 Y% Y3 k a. [" D# v
do-plots: T3 a- ]( G: v, N1 b' R
ask turtles [ setxy random-xcor random-ycor ]
$ K' V2 B# }/ b+ ~. o/ ^8 l% Dend N- ]: `) z$ _( _' q. A
to go
; F$ {" F) h1 w9 `, _4 l5 w) i/ o move-turtles
; f, c2 l+ H# P$ U; i; m2 f eat-grass
. i3 u, p7 u% o/ v/ h reproduce
) J3 S1 K; f g$ ]' }8 K: q9 C check-death
- h! P$ u- u, y regrow-grass
4 S! Q9 n4 Q# y' M5 ~: G do-plots& l8 z9 [$ Y0 V
end ]! w$ m' I7 t, U% i; H! m _
to move-turtles
: k: T1 n" n. P- i7 v2 X ask turtles [( H, U( [6 S! T
right random 360$ o5 R2 _- y0 K1 N
forward 1" ^( k. p' Q8 A6 H& f: L$ X n
set energy energy - 1
. C8 r E# n; J( V* I, c ]+ [: ~) s3 ]; K' u
end
" U9 H* `, Y7 H) O# Hto setup-patches
) r) W# C6 y2 }5 V& a ask patches [ set pcolor green ]
( d: J% y& l/ c# {, X$ Qend
* m6 t+ l" I9 R2 `2 u6 T7 Nto setup-turtles
! L: A% R4 p" a/ c) ^& ~) D create-turtles 100' C8 t+ u, F$ e
ask turtles [ setxy random-xcor random-ycor ]. y* [7 \3 I+ Q0 b7 X
end
0 k* u3 O2 g R& B( |to eat-grass* |$ Z" r! c+ y0 _; Z6 [5 z$ C, [
ask turtles [5 U5 K2 L, n% y* [9 u* r
if pcolor = green [
/ ^ Q+ X7 Z0 W2 X set pcolor black
) a7 f Z) X$ h- ? set energy (energy + 10)
. z+ L5 K$ E( x" h! X4 o& {3 U ]
; y, R/ H' Y) l; T: p% T ifelse show-energy?
# R0 l, d4 R# y3 B [ set label energy ]
$ ~/ v2 S" G" s9 G [ set label "" ], }! g6 S$ @4 c5 b
]5 r- C' L4 h4 m2 [) y7 r, U+ x+ I
end
% R+ j+ \+ P: Xto reproduce: N# M# b2 F! c$ c: t; x; a
ask turtles [* o/ @! i; u* y% E$ ^# H z6 o
if energy > 50 [
1 P7 \. |/ ~+ d7 F set energy energy - 50 a/ k6 g! h. T8 \5 K9 H& ~
hatch 1 [ set energy 50 ]7 f- I' ~0 t4 G5 ^2 z
]
' E7 N. U, I. P+ d ]& K. q0 n1 V: l" C2 A$ d
end4 ~0 u# ^: I5 a2 o, c5 z
to check-death% I* Z; f# a. s& F
ask turtles [
2 B" y! [- {8 m5 s5 c: g if energy <= 0 [ die ]
3 L) L: M1 N9 H( Y8 o ]& y% C+ V5 v s2 ~& j
end7 h; T+ m: e' S' d6 k
to regrow-grass
; z0 X: Z4 R( \3 O ask patches [9 d4 z8 J4 k/ K
if random 100 < 3 [ set pcolor green ]
* {& L L# N0 ?/ U ]) u" g$ V9 |, W% \+ Y
end
* p2 y* V2 Z4 n4 w% C }; T# p% N; S7 fto do-plots
% S' P3 M/ k* L5 L D1 D set-current-plot "Totals") [" M& w1 `6 d, Y! X
set-current-plot-pen "turtles". K0 A4 I7 |2 @4 i& p3 S
plot count turtles) B4 W+ P" M- S& o. @9 A$ M Y
set-current-plot-pen "grass"
2 |' M5 o. D" m: U# O- n plot count patches with [pcolor = green]( m+ O7 H* ~: Z. v; r, @
end6 |5 ^! h' B# f1 o- E
可是运行时提示no such plot: "Totals"
9 ^0 x9 {# w/ o" O, \# Cerror while observer running SET-CURRENT-PLOT% a8 j$ ]5 [" ?: K
called by procedure DO-PLOTS; l& `% S$ M# E2 p1 y) V5 |
called by procedure SETUP+ ?5 O6 G! R2 `8 i8 V/ R% e
called by 按钮 'setup'
0 Y/ u% I+ g& p; K" q1 w求大神解答啊 |