我编的程序如下turtles-own [energy]8 s+ ]2 ?. W) a p" \
to setup
# ~6 P! K A; m8 ~) _ clear-all2 n- T# U' t9 g ^7 ~
setup-patches0 z' D- S7 J* F
create-turtles 100
; u( u) t$ Z1 B$ [" L do-plots
9 q* y! V. v1 W' A* K {# C! k D ask turtles [ setxy random-xcor random-ycor ]
! Q) o% O% A" a4 o) Aend: } y; A. H' c' s8 m
to go
& T; V# } k; \ ?( ? move-turtles0 q2 C+ \1 @1 M' W$ k! C3 ]
eat-grass1 T. e5 ^7 G3 a! {
reproduce
) h9 ]' M9 y4 r9 j/ y4 y) i( I$ ?& x" C check-death
; h& k d7 F# }( R% D9 I( H( C regrow-grass4 A9 D. D V# E
do-plots, G* j7 o( `2 ?! F* G( l0 b- ~
end
, M. ~. k! K+ c$ e3 oto move-turtles
, |6 _$ ]4 ~( z ?. D6 x) }. w ask turtles [+ J' O$ x9 K" {
right random 360. p- P) ^# C* M+ r# n
forward 16 u$ z4 \$ V$ z! |6 z4 h
set energy energy - 1
# O7 O' C6 {/ k( ?; O1 K7 _, [) } ]6 }, e, W1 _4 a% A# c1 j
end, c9 a# D9 j7 z% G0 c. N; q
to setup-patches
- r% F* k/ ]& q! C ask patches [ set pcolor green ]
$ v% D; x9 T! l+ c! n6 Iend; X! _* l/ k5 b7 `% K
to setup-turtles
! _& W# K, Q' p& @: u2 R1 n! r3 {2 m create-turtles 1005 f4 M' w6 t, s/ C6 Q
ask turtles [ setxy random-xcor random-ycor ]9 B# }( k8 S7 I
end
5 a8 }8 V9 ]2 x. s4 U Sto eat-grass
( a* o0 `4 w! X ask turtles [- ^. j3 s6 N N2 }7 {5 l7 h
if pcolor = green [
/ E, N* ]3 [, h* D0 c9 V: Q set pcolor black
# ?0 ^3 W/ o: @8 | c set energy (energy + 10). P: L* m" D; Q# X. J0 q$ n- x
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ifelse show-energy?
: B0 L7 G' @% j# _ [ set label energy ]% i) Z; q% i; j" ?* q
[ set label "" ]
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end
" Z8 Z `4 M8 J) W. U m9 K/ J/ sto reproduce
; W/ y& U" e! }: T( u ask turtles [4 m/ q: q9 C0 r- \# D
if energy > 50 [) U+ y2 ?( P/ _5 z, H$ p2 |
set energy energy - 502 a. W$ Y, p" B. c z
hatch 1 [ set energy 50 ]
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]
9 v; F. K( {4 K& p3 Y$ s2 `end( j% S: l4 K# @; R# }# n; N' n
to check-death8 [: m; m& L4 I) I. @' B% T; Z' P$ Y/ o
ask turtles [
4 l! q; B5 H+ J0 B! O; T5 U if energy <= 0 [ die ]/ |5 P9 e" C( l. v- v0 V
]; X. K3 m& S8 w5 D+ [$ q w
end: b8 T$ t' }' X4 ~6 n
to regrow-grass7 Y# u# Z/ A! }3 V, l
ask patches [* w& X% b9 J) ~- A* I
if random 100 < 3 [ set pcolor green ]
8 |+ x* a9 R6 {( O5 R ]3 m6 l; F9 z( o
end# _, {8 q/ I( y2 Q
to do-plots
w# z1 ~/ ~2 O4 l0 e1 W set-current-plot "Totals"2 Y" `8 {7 a5 q* P4 T/ i3 H6 U/ a
set-current-plot-pen "turtles"
& e: X# o9 P2 m4 c" |. t! Q) s' i plot count turtles
% j" i8 B* p2 M& ~+ ? set-current-plot-pen "grass"* V1 B4 \' u/ ?
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
8 J6 p' n6 _, s( Q/ U& Qerror while observer running SET-CURRENT-PLOT
* b" G) ]$ d- k; o% g' { called by procedure DO-PLOTS
9 e& u$ ~# u6 v called by procedure SETUP
$ P1 q% n* j- k( D6 V called by 按钮 'setup'
5 Z! N( E9 S# q A" o求大神解答啊 |