我编的程序如下turtles-own [energy]( l4 l7 Q# x. f" F$ G$ i1 J
to setup' I: G6 l' E9 H; |5 g4 a8 O, Z! Y
clear-all. v" [- ^# @+ C" |) U+ k( b
setup-patches
- `" b/ U* n. i5 h. t8 x create-turtles 100
2 E6 ~7 x/ ]1 ^: Z$ J% o, Q+ Y do-plots
( e, G: f7 _& W* T1 E: u' w- P ask turtles [ setxy random-xcor random-ycor ]
; y! Q6 @" V* Z: m" D% q( |end3 h9 Y0 E, ?: J% \/ H$ V) V! `
to go- Y6 }! n: U5 x" V6 a; B
move-turtles
& d! x# g& X* i& C2 z+ h" e- z eat-grass
4 I M5 \9 v0 P5 r. i3 c2 d reproduce
* L0 i5 K4 i! n5 Q$ e) c7 r check-death
1 k! k6 ~" ^0 W) e1 w2 N3 O/ b regrow-grass6 q N) u) ^, i! P
do-plots
. R0 H1 `6 V( ?. V+ Lend
( ]7 j. l0 l3 R2 [to move-turtles
/ |9 ?. L9 Q: q ask turtles [( [9 d3 q' t+ w) q9 T
right random 360- _) x6 [3 W/ `' A* ~
forward 1/ ~/ t: w) V/ R/ K3 L3 z
set energy energy - 1
: V5 E& _, T# I @4 \9 v, o2 v8 _ ]# {+ ~) Q5 v6 y: {( n, D/ a- a/ t
end
3 X% o5 z3 v& \to setup-patches
+ P& `9 ` G, T. t ask patches [ set pcolor green ]
4 m% f- q, W0 W* X' }2 gend
; H% O" [* F& v- eto setup-turtles: _$ Y8 ^1 H2 ?
create-turtles 100! J* U. W* G2 o
ask turtles [ setxy random-xcor random-ycor ]1 A. Z* O+ l. E. z! M
end
* z" v+ P4 u; P& Dto eat-grass
) \% R4 h$ P+ g W- \ ask turtles [
* P% E; N# A- j if pcolor = green [
$ u: b/ I: w2 @/ j0 B set pcolor black+ T9 Y q( B/ H/ e
set energy (energy + 10)) N4 e* v6 G% H. K( n5 Y
]/ w b$ C6 T$ z$ g2 J6 q- H
ifelse show-energy?% s( ]$ n1 @0 H% S. L1 m# W
[ set label energy ]
9 C7 |& `9 c4 ?) T3 L: N0 R" v* M6 s [ set label "" ]
: \" P1 |1 D6 C) j ]( x4 ], Z- Y t9 V5 I
end
. ~+ E; Y2 ^$ qto reproduce- t7 Y$ `2 m* q4 {+ E
ask turtles [
& x% k( `$ |. L) O7 ~ if energy > 50 [
* j0 G u: j' Q( R set energy energy - 50
; ]* P( }3 C/ Z# U$ u hatch 1 [ set energy 50 ]
4 v5 @' V G9 {; e7 @; K2 p ]
: V5 H: h( m. U2 t$ c% H" u- e8 j ]
+ ^( {' C0 a' A' ~, hend
: F: n& I& B, Q X- x3 I( gto check-death9 U0 s# a; Y# g% R0 S4 F! X
ask turtles [0 ]+ ~. g2 ~4 g5 z- B/ p. e
if energy <= 0 [ die ]+ l# X7 t* s* g! z- D
]
( Q9 g4 a+ x" d( Aend
8 a, `" Q& R5 A, o6 B. o" S8 d/ W+ @$ sto regrow-grass
: ~/ u3 W8 n' Z+ p/ B ask patches [
8 C# K; q! M6 z+ k; `7 R4 J& z if random 100 < 3 [ set pcolor green ]& ^$ p w! d n# q
]
! V8 M2 G4 a$ e2 [) H7 t+ H9 e5 bend
) e% |% T% N) z) u3 O- l0 Uto do-plots3 \' S! y# _% {$ S# c: G0 c
set-current-plot "Totals"
0 }' o- N+ k! z- M; l set-current-plot-pen "turtles", L$ Q# X7 R4 s9 ]1 e* f' |9 P3 D+ \' ^
plot count turtles
0 N# L3 T7 b: W# N& A, A set-current-plot-pen "grass" o+ a+ U6 m0 n1 J5 M3 n
plot count patches with [pcolor = green], m( E3 W! t6 N0 o: x4 p3 B4 Z4 ]
end1 N6 C" ~1 c+ R+ p2 N0 _
可是运行时提示no such plot: "Totals"
7 w" j4 {& w7 \. y" f7 Serror while observer running SET-CURRENT-PLOT' J5 P0 u) X) l1 C* [+ u
called by procedure DO-PLOTS7 k- p4 L! T6 `+ q+ c# p
called by procedure SETUP
6 H% R1 U: n* q; w4 N called by 按钮 'setup'
3 M& T, c) x* w/ d4 ^* ?% j: p3 | {求大神解答啊 |