我编的程序如下turtles-own [energy]6 D& L8 i. r% J7 e9 W5 S
to setup0 a8 ~! S& L2 [+ a$ r- b# a
clear-all# ] T# Z. J9 S2 m( O3 i
setup-patches3 h6 {: Q0 S' G/ \* c, g- X' H
create-turtles 1000 E# x1 }' @: J$ @! j
do-plots
8 L& {" t' v# t2 S0 s ask turtles [ setxy random-xcor random-ycor ]
" B3 O" z+ {9 ]" ]) n x8 Fend
1 o! Z3 y9 G# qto go" }5 W0 ^& s. V8 w
move-turtles
) \& [/ r, i! I% U c: Z eat-grass
7 l) W* b6 s& y. E reproduce" ? N8 Z% @1 W- {. l. F5 C" w
check-death
/ \9 s/ [8 \5 c" ^ regrow-grass; I2 G. K/ O- J* i3 P
do-plots
5 T4 P/ w5 C0 W3 Q j- T0 uend
. Y# h# G% S& x4 I% S' o. z0 g, D) dto move-turtles
3 d; O3 A# V' i# [' u% |! B ask turtles [
3 Z, O4 D3 H/ P! a; h* V- {0 B3 } right random 3602 t6 } C) x! f- f+ f) M
forward 1. ~# a2 N5 _+ B& s `( m* O
set energy energy - 10 j) P1 W) g S& ?/ u
]
& t9 N+ F7 E [9 L. w& xend
0 I7 [9 E" W! ]( Y, W( dto setup-patches; |7 L0 X. j1 ^0 e* W& I
ask patches [ set pcolor green ]
( Y% k1 i% u) z3 }* W0 xend
. _9 B, ~8 F; K/ Tto setup-turtles0 I- z4 o+ o$ g% h# V8 @0 N! T2 ~
create-turtles 100, V- H- Z' x( O) n
ask turtles [ setxy random-xcor random-ycor ]; w% C X4 f! m! l8 G8 u& }5 G' ^0 o/ s
end
: m' X+ D2 H* I4 bto eat-grass! [. B9 x s# d
ask turtles [# g1 T% y4 {9 u. P$ i" ?* B' ^
if pcolor = green [
! y. C$ G1 ]8 ^: ~1 \: ^2 O* W set pcolor black
5 H& |2 O% ^, l5 y& p7 c set energy (energy + 10)% b6 A7 A8 ]# U" {
]
8 n& P3 U- r4 ?; r6 b8 t6 o6 {7 A9 l3 g ifelse show-energy?: a9 k0 y0 b2 ?. k( F
[ set label energy ]
8 @. N6 t, J- ^: |2 {# _& v3 P [ set label "" ]
+ p- ^! {6 }" N; j$ k( ^, B* ^) X9 d ]
# e; U8 [$ Q0 u Eend6 I7 ]3 U7 h1 Q6 E4 U8 A" s
to reproduce& _- [1 n/ U1 S3 U/ A* x
ask turtles [( h# F0 p1 l7 ?6 b
if energy > 50 [" l3 e2 r8 D! T. ]! n
set energy energy - 50. \5 @, ?2 M+ Y
hatch 1 [ set energy 50 ]* \% w% O# Y: E: A
]; O, u7 D1 f/ c" H1 A ]
]
5 b- V) M' F( |# i8 m5 q& v" X. l/ x6 zend
, I7 c1 g4 G& W# | O7 {* \3 H# T8 zto check-death! d. x6 _- W9 B* r1 j" Q! t
ask turtles [' q5 N0 Y- p/ I" u) {: l' b
if energy <= 0 [ die ]
- g% L5 H( L6 z g" ] ]
* P& Y* s. g m A. j+ d$ a# {2 `# N# ?end8 c( p, w3 b0 p$ z
to regrow-grass
# }3 E; u! t O" p8 s9 Q8 _( m' t' v1 [ ask patches [/ Z( h6 G1 k0 l( B2 p
if random 100 < 3 [ set pcolor green ]4 y* ~, k3 i) s) K" y
]; X- N2 s b: c4 x7 I7 C" d
end) }* J ?+ ?) W; _/ W7 j
to do-plots
* n8 h9 I) l6 c G set-current-plot "Totals"
% R7 }1 t8 {$ E2 }5 I set-current-plot-pen "turtles"8 V# |$ g& M/ M) T' H
plot count turtles
: y! N" _8 V0 h' G9 m- e/ o set-current-plot-pen "grass"
2 V! e% H$ u6 P! j7 W! y plot count patches with [pcolor = green]
% ~; ~- V2 Z3 w; ?: Uend; r8 _( P4 B9 ?/ b0 S7 p
可是运行时提示no such plot: "Totals"
7 B u5 e; ^: N2 verror while observer running SET-CURRENT-PLOT
6 {1 B0 V6 n; z, g' J# G' g# f+ ~/ ] called by procedure DO-PLOTS( p& V, A' V- c* T) ?4 j& I' R
called by procedure SETUP
& i' a5 B# x) y+ a called by 按钮 'setup'
- X6 {+ W/ A" y" @4 ?& j求大神解答啊 |