我编的程序如下turtles-own [energy]
1 b o9 o! X; x" U$ }& _: }% pto setup/ [% ~: M/ o+ \/ F: n) X# y3 Z
clear-all
' F# j5 N$ s! U# X6 O+ A" d1 P) Z setup-patches* ?$ P7 J! P0 A9 I4 M- A( ?
create-turtles 1000 j; c' M" ^- H9 Z# Z$ Y. g
do-plots) w7 r0 {' C; I
ask turtles [ setxy random-xcor random-ycor ]
' ~; T' o+ r0 {end
; a) O( y+ H! ?( k" E gto go. g- j- M# {( N4 N$ V. K* v x2 e
move-turtles
5 a2 i) h: N7 u, l4 B eat-grass, P' q# }; H7 ^4 @ i; o0 q9 C k
reproduce
) c% s% \+ L9 P& L" \$ s check-death
$ c7 z$ i! u V; U9 M6 p regrow-grass1 r' L$ [6 M, L# ~, c# u: X
do-plots) Q4 U e8 A: Z
end8 D/ P5 s$ {; Q6 y$ b; F. E
to move-turtles
. L7 G0 M/ ?, b1 X# |9 O4 P9 M ask turtles [
* b& p) ~1 O- U" N9 ] right random 360( c1 [" P- t; U6 e" D# _6 a
forward 1
$ {( W( ^5 Q' Z set energy energy - 17 B, C1 [0 ^: t2 w! Y X' \: Y
]
! _4 X( g" X2 y$ h! l2 Iend
8 ?5 N% U' `. G* l4 rto setup-patches X O* M9 W3 H
ask patches [ set pcolor green ]8 _0 Z' b8 v3 x
end
5 L- j5 T( ?( m5 U' {' ]* Qto setup-turtles
$ ~4 J7 L, ]: v+ ? create-turtles 100
8 [% l3 m$ w! b ask turtles [ setxy random-xcor random-ycor ] j: p3 X0 ]3 N* u$ v
end
' u2 | F$ b- m7 xto eat-grass Q( k- l* G8 r# A4 j
ask turtles [3 g. S. Z8 r8 p, X
if pcolor = green [
! l9 F7 \! z3 @7 A0 Q& E. {# ~ set pcolor black! J$ O6 d7 ]8 g9 p7 t
set energy (energy + 10)
$ Q% j( p0 }4 `, B$ k) y ]
& T& |/ E9 U1 H% h. `* c8 C ifelse show-energy?
. K' T* w1 H, Y; U [ set label energy ]! _7 i6 C" X% v8 V/ |1 j `- l' q& {
[ set label "" ]" |. ~4 B! ` Z# H
]
' K% ]1 J7 L6 R9 bend9 `7 L- W5 z8 I$ F
to reproduce
7 G: |# `7 r' c- k ask turtles [7 ?8 |% e* ^0 G, o+ ~- S! S
if energy > 50 [9 ^+ O, d! [% V4 I
set energy energy - 50
$ h7 @3 a2 ?% k2 g9 E% v- _ hatch 1 [ set energy 50 ]; h! |+ z" z1 g7 I! Z
]- }' d: u$ j( o6 v2 o4 s- J0 R0 d9 Y# X% L
]
, w8 }$ L! z4 v* @4 _/ T9 d% uend
+ b) C8 P% P$ p# \- L. {! sto check-death% G! r1 A5 ^9 V$ p& D1 G
ask turtles [
. P' l- ~& d- i if energy <= 0 [ die ]; ]* ~' q% H( U! t) O
]
( w2 }, Y7 A; R5 G) i( p& k0 rend
- X" ^+ W" i- H( I' h& x+ nto regrow-grass
* e/ [: B! F' M6 E; v6 z" c; s2 c/ T7 H ask patches [
8 l* t# o' D, A y0 n2 r5 j if random 100 < 3 [ set pcolor green ]
' t% ?& S4 w/ U6 _3 X5 @ ]7 d; ]# u; U, @- r) ~7 b1 p# T
end
# d) [/ g1 D1 L* e3 ?) Rto do-plots
+ r O, b% d( V: Y set-current-plot "Totals"
. h& f) l! f X, R8 o( n' c set-current-plot-pen "turtles"
: ]4 t) D2 F0 F& s plot count turtles: F& g& d, t' x' ^5 Y1 c; Y
set-current-plot-pen "grass"
3 O; U+ Q* d. \& V% G$ Z6 m plot count patches with [pcolor = green]: o+ y- N. ~5 W5 S$ h" u
end
2 n7 K3 P% u5 R3 a可是运行时提示no such plot: "Totals"
" ?/ V% h9 }7 r+ D. |error while observer running SET-CURRENT-PLOT
( Y1 U. L+ `4 n* W/ [: N called by procedure DO-PLOTS
" ~2 I5 T1 M8 i* v8 f% ? called by procedure SETUP$ }. q; ^3 ], e: z0 t2 _
called by 按钮 'setup'7 k1 X. @/ a- ^$ t1 w
求大神解答啊 |