我编的程序如下turtles-own [energy]6 g1 [! I# }! M" f% _ H+ @5 S
to setup
% `% [+ o/ P2 s; l7 I# V: U4 Q clear-all
1 M- ~0 D9 a1 L. f4 d! E8 d setup-patches
- t* n5 ~. q, ^( u$ O create-turtles 100
- x8 w3 q( c4 E do-plots
% |- _5 B1 @0 _0 d) r' i2 a ask turtles [ setxy random-xcor random-ycor ]+ b. b" U2 n3 w* l$ G- j
end7 J/ T1 V" d, t" P
to go5 m# `2 T1 W1 F
move-turtles3 s* D1 j( |& |8 f( e/ f$ o
eat-grass& x2 b1 h; q* g& L1 m1 l- s
reproduce
2 n& \1 }& X1 V# {, E3 @ check-death
$ w) Y8 [& [( ?) k( Q& P2 l regrow-grass
7 s& _( E/ Q/ z7 p8 U: ~ do-plots' V% \0 D6 c. W* L
end
; D# n# y+ C8 z& @& }7 Xto move-turtles) V- e( o% C0 b" `) O8 t8 z
ask turtles [
N* V* S; q8 I/ ]7 y U right random 360
* ~( K. |+ I: q6 P, |5 T6 ^ forward 1* J3 G* x7 q% P7 C
set energy energy - 1
. x" s' W: o* K; ~ ]
7 q' S. @" o$ X* ~end
+ D# O h2 z" o# X& q5 C% l8 r. X& Yto setup-patches
: N m: r4 R0 l( X! N' Z# j ask patches [ set pcolor green ]
) v$ \( N9 z# e5 ^7 Kend* z- \- ]# b+ f* J7 B7 l$ ^: P
to setup-turtles' R. Q6 ^! N% X: J
create-turtles 1006 m& A* s8 d. u/ d. R3 K! i
ask turtles [ setxy random-xcor random-ycor ]+ s+ x7 V0 u" P$ d U5 {
end. R: L0 K* J& h# {+ ~1 v
to eat-grass2 N4 y: n( b* {! o# ` N
ask turtles [
) Q5 [# S* x( F- F, s& Y! T if pcolor = green [
( D9 D V8 j' K8 ^* }" X set pcolor black
6 h2 F) z2 `9 O- ~, o4 Z, m7 b! h set energy (energy + 10)4 e) ~5 r* P$ _/ d; `1 } ~1 s& A
]
! v* ~- @# u, c: f ifelse show-energy?
* F# @* R/ m1 H N: [" x [ set label energy ]9 G7 C* B" L* X: h {) F' z. B3 @7 L
[ set label "" ]% S# F. H5 k7 E
]
8 P9 W' J/ m& E% N$ w( N1 y/ _# lend' W. m9 K/ [! w& d! L) g
to reproduce
- ~2 G. ~; S) h0 y9 _2 \0 a ask turtles [# D0 W( x/ p2 C* b8 ~
if energy > 50 [
3 Y% j7 T- \7 I6 D* U8 r set energy energy - 50- ]7 W4 U; j8 D* s' H
hatch 1 [ set energy 50 ]
7 b* {$ @9 V5 l7 V ]% a( \" T2 V% \- O, O
]1 ]! v, K; u6 I+ ~! E
end
/ {. I% J- j; Sto check-death
- Y* L+ e2 r) _1 ]6 D9 H ask turtles [& `; j" J" B* B0 G! _
if energy <= 0 [ die ]
+ }% I- w( q | ]
. V$ a- v+ X1 h h% V( uend5 f8 I2 b; K& J9 m% }( [7 m' P' n* H
to regrow-grass/ {2 f2 F2 W! u6 S
ask patches [
$ U" |" P6 |4 U if random 100 < 3 [ set pcolor green ]
9 r' W/ T9 E v6 H8 g+ u/ R- F, j ]9 V" f. z0 P4 _* O
end6 k# J$ E; L$ r& n
to do-plots
7 ~+ l( C5 u# Y4 d set-current-plot "Totals"
# m3 w3 Z; [" N% C: f3 E) m& p set-current-plot-pen "turtles") d9 {) s) Z) d6 x
plot count turtles E2 o+ W# X+ l/ R* g
set-current-plot-pen "grass"' O: p) w* F' {( g, j2 i! F
plot count patches with [pcolor = green]7 C2 }: t7 ~# A" d. M2 Z3 q
end2 n- k: I$ P+ Q) c/ ^0 }2 Y
可是运行时提示no such plot: "Totals"" L E& E: g3 T( @
error while observer running SET-CURRENT-PLOT
; _9 p C3 ^0 N( K called by procedure DO-PLOTS
( m4 @' c% {9 h( a7 l3 Q6 W called by procedure SETUP
+ x5 W" d3 O1 J1 H0 C8 I) I; O called by 按钮 'setup'( [" E) `8 A2 q$ C" e( H
求大神解答啊 |