我编的程序如下turtles-own [energy]! C- ~' i4 n7 s5 S' i
to setup
, Y: V+ ~& J$ Q+ T+ |- T clear-all
/ t) m2 Z$ e3 z# d9 v setup-patches$ z# u0 A5 N; F
create-turtles 100* ?' w! n8 {/ u4 N
do-plots& d, d8 h* N* G+ o
ask turtles [ setxy random-xcor random-ycor ]9 r! F' n; |, m! w
end
0 }- ~& @6 S3 ]1 vto go3 \5 H3 c; e( \# [) P! D* R X
move-turtles7 L/ T) ]9 n5 n$ G
eat-grass0 y$ I- r1 Z% J5 \: `
reproduce6 \# c. d7 ?. c+ ?7 k. y
check-death7 z: N: P7 j& u4 Z% ^
regrow-grass
1 X. P ]7 J9 g* n do-plots& @% E1 j S( o8 _
end
) i, o' b* B% V" W2 M. J( s0 hto move-turtles6 N3 L; X4 _( c- a( a2 I7 T
ask turtles [
% C$ Y0 R- P$ F2 z2 P! K' Z$ v0 z' z right random 3609 y' H- K6 b1 ^: _
forward 1
8 m* \8 W: E) [& w: k9 d! ~ set energy energy - 14 [ p/ M" b! [) o% O
]5 G" F, ^( W4 N) X7 h, M: P4 J: D
end: M2 H' g1 I0 h3 l0 a/ \; ~) H
to setup-patches9 t, W' f9 S# N7 o
ask patches [ set pcolor green ]
0 f9 F, ]- R ] V3 \end% i6 h" T2 }1 M6 I2 Q( Y
to setup-turtles% Y/ y5 o8 w$ l) c* B) Z
create-turtles 100+ k8 |9 z! B0 p% G2 S% P' [
ask turtles [ setxy random-xcor random-ycor ], c: J2 \" ~3 k! l* d! V
end
- u+ z$ T- {& Yto eat-grass* s+ k( \6 s4 p; c$ f$ r
ask turtles [
: @6 z) J, p9 \5 K if pcolor = green [
% [( b0 f- L6 T" C set pcolor black: ]$ G6 {! s/ |
set energy (energy + 10)" |. M1 C& x0 U# t! A
]
2 ^- X% {2 {; G0 ^3 U; Z! k. |* J( Z ifelse show-energy?% i# i! C1 e3 o8 G" Q
[ set label energy ]/ o! L6 |; [, P/ |
[ set label "" ]9 M' p( z- h, T
]& R+ @; y# D1 g$ l, V
end% S3 M2 U! R1 H. Z
to reproduce
; `" [+ i. A* W9 Q, G: V3 G2 U ask turtles [* [6 Y& ~/ [8 I
if energy > 50 [
# O3 t4 @- }5 l/ m; p+ w$ H set energy energy - 50
8 D$ |5 U5 ~0 `, \ hatch 1 [ set energy 50 ]- k- M! g3 p: p* y8 @, G7 H
]
6 E2 M1 W9 `9 H; f9 T h0 W8 L ]
# O( C" O9 c) nend( T5 B4 _* {8 u G( s
to check-death0 ^. O# t7 R2 J$ V }( Z
ask turtles [7 D: d2 h" {7 H1 q0 H
if energy <= 0 [ die ]
5 |4 w7 J/ o+ @$ D- l2 ]8 r9 h! } ]7 i/ i. G: M/ f& G! y
end( e4 y4 p E/ m) u! m5 V4 z
to regrow-grass
1 G$ k$ X% }1 P: G; e9 Y3 M9 P ask patches [
$ K% F* l! ~" D( i if random 100 < 3 [ set pcolor green ]5 m2 |+ F' E- @3 Z6 `
]: i/ O( U0 f5 |/ p) n" f0 D @
end( d: g! [* d' r' Q
to do-plots6 t5 S+ u/ | t7 C! j& y
set-current-plot "Totals"1 `' P5 U9 k& @( D( z; C7 k- i
set-current-plot-pen "turtles"
8 Q+ z2 Q0 _2 w plot count turtles
% o- u& Z; v% R0 l set-current-plot-pen "grass"
4 z, g m* T. j9 Y, U5 K7 s plot count patches with [pcolor = green]/ ?! ^3 Y8 w/ I9 }. r
end1 s0 c2 Z4 J4 }% s; d& `
可是运行时提示no such plot: "Totals" \) f) t* k+ E# R$ V$ H: c
error while observer running SET-CURRENT-PLOT3 J# i) D% \! L1 T- i. ^) U
called by procedure DO-PLOTS
! _9 t4 U# U8 S, ~ called by procedure SETUP
. m# f# ?- u! \6 z, R9 ]' i7 J4 B called by 按钮 'setup'1 ~2 S# w4 A0 L4 j+ B. y( `
求大神解答啊 |