我编的程序如下turtles-own [energy]" ?/ _% m9 s' M4 t5 F
to setup
; J' K; f9 E3 K clear-all3 a2 Y1 l7 ~" b
setup-patches
) v4 |( K7 @- R. l create-turtles 1006 b4 f# e# ] \" _$ P
do-plots
& `+ ]1 J! }) n# [/ }' [ ask turtles [ setxy random-xcor random-ycor ]
& X& M4 C0 J& e7 B vend& @/ }, P4 |7 r
to go
. J: a/ g y3 k4 j( n3 G7 e4 C& Q move-turtles4 p r4 j+ g& R1 v8 F+ g8 m0 w; x7 T
eat-grass
) u1 c; }9 g. K, u A/ U6 P+ n- b reproduce. v( g8 }/ V( W: z3 k8 y
check-death1 A! u) B# `; H
regrow-grass
; [! f# U: x' e/ u0 D$ f& m* w& d do-plots
$ o6 k9 {! Y. h5 Yend# i i2 a& b( W8 c% z7 Q3 s
to move-turtles3 F- J/ R. _& ~4 {* A. T5 s# a' H
ask turtles [5 j3 N" U2 F& M, c
right random 360 \' C7 U$ k0 }/ S' \) N+ f
forward 1
5 f* ^1 b; h/ \/ B# U- h% O set energy energy - 1( j6 V6 }9 ]5 _7 ?( v g* q
]: ?4 `0 R5 C0 x p' `% x1 x
end
. c) y( C- Y y* F1 nto setup-patches5 b* `3 P I6 e, N8 G
ask patches [ set pcolor green ]! c2 C0 a9 ~7 f$ J" X0 M
end
8 n2 T# z0 m4 D9 q) Wto setup-turtles1 S) o6 i( z( G9 c3 z
create-turtles 100
) C. K( \* x! I8 q2 S; @# g' q7 ~ ask turtles [ setxy random-xcor random-ycor ]+ t1 b' H, J0 y5 u+ K
end* _* _: M8 I: J; o; T- h2 _$ w
to eat-grass- ]( q- S5 N: m; G+ s) e
ask turtles [$ U6 F1 r/ ~6 S5 k
if pcolor = green [
, X! @' t9 M) r. Y. b% c: c set pcolor black
9 |9 ?! X0 \4 b; ? set energy (energy + 10)3 d: N, [3 z% ]+ E% Z
]
& h) V6 g8 V# q ifelse show-energy?
4 R7 Z) \% G) \) R' t [ set label energy ]" X n3 H1 l) E. ?! m& x( N
[ set label "" ]/ q0 M; }- L/ A% P
], c! H7 \7 e, T; T+ j8 [$ m" g/ t* X- {
end
3 A( j7 u; m; H0 h& Jto reproduce
/ C" R. j' t- K) m ask turtles [
+ L- g, J: ^4 Q+ J* c# r if energy > 50 [8 ?. Q4 [* k+ A6 A( {6 z( o
set energy energy - 50
6 M: D% }& X* O8 i7 E! t hatch 1 [ set energy 50 ]# c0 q$ ?5 z) G5 U/ q+ g; l b
]5 w4 v- D: i" p
]
; p, o; D. S1 y% |& Gend0 u0 s2 B' B6 h( L
to check-death, r Q. R9 [/ Z/ Y0 f! Y& n3 _
ask turtles [7 e- ?' F7 S/ t/ i
if energy <= 0 [ die ]0 F( H e2 K: ]
]
% c( }# \9 N, Q; T! z8 h/ Qend
: D* G; u3 s$ [to regrow-grass# i0 b6 k6 v) a7 ^! F* x
ask patches [
) ]! F% z( C2 k5 P if random 100 < 3 [ set pcolor green ]) i" r1 z( z8 N
]' P; x7 d3 C. ^+ q1 ^4 d# V
end
: D# {8 s# I% S. E$ Pto do-plots/ I r& V' N! b0 F
set-current-plot "Totals". N% T! ~; v! r/ _
set-current-plot-pen "turtles"9 [& H. ] m! p f
plot count turtles
' F% ?4 G* x* a5 o: } set-current-plot-pen "grass"7 p, r( f" z& h# M2 T
plot count patches with [pcolor = green]' e$ Z7 Y& {/ r P# b P
end- V1 K; T& t4 J& }7 c
可是运行时提示no such plot: "Totals"
" @. o# j6 l0 M1 w# ]1 h `5 Nerror while observer running SET-CURRENT-PLOT/ @4 N, l: I* C1 J, S( N8 x
called by procedure DO-PLOTS: y3 H: U! [3 o5 S& K
called by procedure SETUP
4 m. P! @0 B' h/ l. f called by 按钮 'setup'* h x; z v" N5 N1 p8 c
求大神解答啊 |