我编的程序如下turtles-own [energy]4 h$ \# _; S. ~" \0 X
to setup
; X1 S v$ T; t. J+ [. e1 u3 K clear-all
9 L8 M4 g9 o6 G setup-patches
) c2 r) S- x$ v' w create-turtles 100
' o- |. d3 u D: |) @' }1 O( b do-plots6 e8 x2 c( N+ e8 V9 E
ask turtles [ setxy random-xcor random-ycor ]
& ~- r6 ^/ A6 H% O5 W+ Oend
Z) K* o" {& bto go
: W- c* \$ @! ~ move-turtles" P y6 v) P; f" p
eat-grass
& S+ g" v. l7 M( i0 ` c4 j reproduce. e6 S; r. @- |- ?1 T6 z# a6 [
check-death3 G. A! J5 b- J9 c+ @0 r4 u
regrow-grass" F0 N/ n% p1 F2 Z
do-plots& u# Q) x! l0 p% \
end
6 ^ _1 {$ Q: A+ Cto move-turtles
9 F' u5 I, _( u( _: O ask turtles [
. o! |3 g. }2 i right random 360
9 A. Y( S0 `3 \* @5 R+ m forward 13 S7 h3 J1 Z P! t K0 y
set energy energy - 1
6 `+ L# G! R0 J- X: V/ t1 @ ]
" U0 Z" C, |4 z4 S$ |, hend
/ H+ o9 Y% e; R' h& ^0 p" B! \to setup-patches
3 {$ x6 k3 c( Y# H5 u2 v. K8 @0 g7 f ask patches [ set pcolor green ]$ s* L) S/ a4 V* [ m- u
end
0 E$ M6 }. A1 {* I+ Lto setup-turtles
8 J8 w1 t$ v2 j! x0 c create-turtles 1001 E! X8 A+ J1 [) d; c. f1 w5 e% o
ask turtles [ setxy random-xcor random-ycor ], V' v; g# A: D6 R, X) ?' ]8 x
end! s S5 |- t9 E, Q, ~, D0 F" ^; w
to eat-grass
! C1 |( c+ u5 d- M ask turtles [0 u J' j- v4 Z: P5 m& y9 S
if pcolor = green [6 {3 ^. i5 o' o- x
set pcolor black9 w ^+ X; }& `1 d" u0 n: R
set energy (energy + 10)3 k6 k3 Y! i$ [7 E: q8 e
]
m( ?$ C+ `: \: Y1 ?' X/ B ifelse show-energy?
! v- v% `4 U; v' j0 | [ set label energy ]
, _8 t, z3 [& X/ G( |0 z! i9 @( ? [ set label "" ]
/ X8 c0 G# {: n P, n; R& f+ b* ?% } ]
+ i) A3 [, x' m/ tend0 K6 _% ?7 v' c& O' J0 `+ X: m
to reproduce
) i% ^; F. ]& u/ k; p ask turtles [8 z' p0 o1 z& N$ M% P& Q6 k- n
if energy > 50 [
% G) \) [# C6 b% O set energy energy - 506 ~/ }% c0 ?0 E/ t" N$ s. Z7 v
hatch 1 [ set energy 50 ]
9 E- r; ~ w* ?2 z' j2 w( y( n1 x5 t ]1 V+ {6 s1 K0 ?
]8 t) p4 h% P9 @% U/ y% s# I
end% H% `; n" E' V% ~& X6 E
to check-death
( U4 }8 X( R: X7 Y' y5 Y! R ask turtles [0 H# @! d. ` _6 S# P2 E: K e
if energy <= 0 [ die ]
. j- B& Q9 m4 h9 ~. l; Q ]
( t8 _: k0 ?% m( V/ cend! d& B3 o5 N% O; r( R2 E/ j5 P) m
to regrow-grass
3 Z1 F" D9 e' [' d9 @ ask patches [& N' A9 _; _4 _9 ^7 U; G. A
if random 100 < 3 [ set pcolor green ]
2 S( L" W. Q: W5 a$ J" [7 b ]% A. Q& z- Z, ?4 u$ w
end
# c% t8 x3 G" Z1 v, O4 Hto do-plots
0 ?" a8 Z# f( x% O/ t! W% L0 U4 | set-current-plot "Totals"
8 s# t/ z+ d5 ] set-current-plot-pen "turtles" Q" M( Q9 j2 ~5 m
plot count turtles
6 m% u# i5 I7 v V: t set-current-plot-pen "grass"
' o' l9 h. k: `/ o* L7 Q plot count patches with [pcolor = green]
1 ]# B# W7 h% ?' fend# c, _$ {- p" a7 J+ m. B8 ^; P" ^
可是运行时提示no such plot: "Totals"
q) P% D& [' ~$ l& k4 Aerror while observer running SET-CURRENT-PLOT4 L2 r/ `. _& @( p
called by procedure DO-PLOTS
/ {4 g/ k0 Y- C1 S8 J called by procedure SETUP
7 g9 M; F7 O' M/ P: \$ F called by 按钮 'setup'
8 @7 b2 |% _6 y5 v/ S% ^2 R3 Y0 `求大神解答啊 |