我编的程序如下turtles-own [energy]
) w% P* p9 ?3 p- T) bto setup
, m* Y+ n- V: K clear-all
( T! s) Z# u; P$ E8 b setup-patches
; t8 g6 V' L" U- H |. K4 M create-turtles 1006 m3 `- h$ N0 a9 i' a
do-plots
) ^4 g# G J, ^4 B ask turtles [ setxy random-xcor random-ycor ]
6 L3 A5 k( l, ]' cend; g7 G) o( E0 t8 V& A7 W/ M
to go
7 x8 c: V$ }1 W* Z move-turtles E( \8 e: g; Z" x! x
eat-grass
0 ?: {8 G! W" s$ g0 D7 R reproduce
2 o ?" E* {$ S; E check-death+ t+ P) n# ]9 Y c2 a
regrow-grass& _: p9 ^3 I* R) J
do-plots; y5 H" W) Y2 \3 s! D V
end6 O R9 C- z8 H
to move-turtles+ p" x1 D) E( q( A( `! q
ask turtles [
0 B8 L; p) p% ]0 K; u+ r$ { right random 360
# k8 B7 o* s" j( r6 {% q% p forward 1
3 N7 H6 h4 @3 h$ ^ set energy energy - 1
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end, h2 B/ d4 d+ a' S* G) l
to setup-patches; b# y3 x! S8 d5 a! R A
ask patches [ set pcolor green ]
H2 s7 G; {4 q- zend
" \* ?9 ^6 w% k4 U2 Z( x% Fto setup-turtles1 b' _) |3 m E# H) S k
create-turtles 100- J4 h: P4 Q' K" x- ]
ask turtles [ setxy random-xcor random-ycor ]5 M- W ~: d- v2 Z
end% `$ v3 c0 m2 R: B" N- K* b1 A0 n
to eat-grass7 [6 u7 Z$ ?* n5 e5 y' d
ask turtles [5 }: X) d# o7 ?# ]: Y! O6 a2 o
if pcolor = green [8 @9 I% D; f: l5 }) t. t$ t3 v
set pcolor black6 w* l6 a/ o3 V
set energy (energy + 10)
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ifelse show-energy?
& ?& Q$ f7 Y, z! k6 I+ x [ set label energy ]
/ }3 _: I7 |" W [ set label "" ], P& H3 k: z" E+ T/ D, Q
]
5 v* D* c/ d$ Q5 U' ^) lend8 d+ h$ h9 u$ |1 B7 F
to reproduce: a; Z" H G2 A0 S
ask turtles [4 j8 F7 ^; G. U1 B. V$ e, {
if energy > 50 [
4 j: d9 o/ y8 S P set energy energy - 50: i& H0 O, M; e( G) o, k7 t
hatch 1 [ set energy 50 ]
& {- w2 {* _: x% b ]5 }/ ?: f4 h6 ?5 p( l
]
; v* E$ K3 X2 Y, W9 C! Fend1 ~3 ^( z" j0 Y
to check-death' x, \% x0 @' l
ask turtles [! Y, u: W& Y& Z& i8 m6 v4 u m1 ]
if energy <= 0 [ die ]
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to regrow-grass
2 z+ `' H6 Y6 |7 f ask patches [
8 w0 r/ U& e: g0 W' U) I/ [4 n if random 100 < 3 [ set pcolor green ]
$ @0 B/ J! ?5 J; e* M ]
' K0 h* W9 D, i; ~5 uend
: o v( [' M" B6 z7 O! Z% U* Gto do-plots- c' y, `/ Q: W! n; x) n
set-current-plot "Totals"
/ B+ [: @8 a0 g3 c" T( H set-current-plot-pen "turtles"
" @0 n( @/ v1 |, O5 ]1 I; T4 u, z plot count turtles
l# u4 X4 u& E4 O set-current-plot-pen "grass"! H# ^# L$ o5 R1 W) P
plot count patches with [pcolor = green]: H$ u4 B) A# J: r
end$ T, P! M7 S6 j* _9 ]- p
可是运行时提示no such plot: "Totals"
9 V7 o. s, h1 _+ Ierror while observer running SET-CURRENT-PLOT
$ B. b7 B" I' R$ G g+ W' o* F called by procedure DO-PLOTS
4 k3 B! s4 _/ I called by procedure SETUP
, ]0 q' d* J: x called by 按钮 'setup'
/ Y9 \; _6 Q& Z求大神解答啊 |