我编的程序如下turtles-own [energy]
7 \$ i5 ?1 D+ e& A7 bto setup
' X0 O, x% B* I2 X$ Y clear-all
' u8 x, R& R0 I' ?" w! V setup-patches
4 U/ v9 _" W7 r: L6 P create-turtles 100" |7 U6 J5 r- }" i: C
do-plots
4 U8 M: o5 F* {( g7 X9 Z) i, [- q ask turtles [ setxy random-xcor random-ycor ]6 f+ K1 \3 t4 M8 ^) Z
end o' p2 B: D# V& m3 }8 D3 P
to go
% \) X6 l0 v1 c' ?+ ^' O move-turtles9 Q6 d' M' p( h* F
eat-grass% a/ E6 l( U2 u7 Y
reproduce
9 ]* x/ F j. m( i. @2 e check-death/ z7 T+ w) n: ]. a8 ^
regrow-grass4 J& _3 }* o) S* O
do-plots
! s( j5 |0 \" G+ N% s& Vend2 J0 F O3 B% W
to move-turtles' Q; R$ `/ G, t0 s0 L0 ~9 X0 f
ask turtles [
3 ^' w- _( t- ]5 ?" w right random 360, t) _8 y. H4 f
forward 1
" i0 K8 Q% v% C7 c set energy energy - 1" d9 l( }' K' e! }. l; f
]
9 I5 J) [, l! I% p$ rend
w8 v% l& }$ qto setup-patches. F7 A. L" x. ?4 E& v4 }* Q
ask patches [ set pcolor green ]3 A; Q, w- G( H9 |3 h
end$ X& E# s0 o% @) }# X7 l
to setup-turtles
9 g* l2 B2 e7 k! X' l create-turtles 100, M( t: I. h5 g4 a- D; f" {
ask turtles [ setxy random-xcor random-ycor ]
( B5 P. l1 \" _; x" f4 O$ xend
8 F* C& Z4 i6 a' h+ W8 u7 P0 {to eat-grass3 F e( I6 Z: j2 X v' m/ F
ask turtles [4 h/ J0 x$ {( u9 y# I$ r- K
if pcolor = green [
2 V% L$ L* P7 X, l/ M7 | set pcolor black
8 s7 a9 z* C ^; b3 ]3 o9 _ set energy (energy + 10)4 I$ K- t# ]3 `9 }5 ^% x% _
], B7 n( Z' b" ^8 N4 l$ @
ifelse show-energy?, N( B+ [7 w: Q1 [( H
[ set label energy ]5 n' [$ m$ e& i! n1 b
[ set label "" ]3 Z7 l/ p3 h% o) j- }
]- Y! x7 |2 l; u9 _$ P1 R( R
end
: x/ _2 [) j8 g" n2 Xto reproduce
1 {' @7 e! y$ L7 U% ]1 f ask turtles [* g! F* X' H2 ]" e$ V1 N
if energy > 50 [
. _4 Y1 \& I/ C7 Z/ h set energy energy - 50
& j. ^* y2 g) B% n+ C hatch 1 [ set energy 50 ] f2 `* a& R0 _, ]& W7 V8 |2 s
]
; {8 Z0 e5 d( V( V, o ]
! k5 h2 Y: B1 V) G7 eend/ N% t; f% y8 ^+ e/ p
to check-death, T- x$ J e! |* k
ask turtles [) Y' ~; {. Y0 U4 F7 Y- l
if energy <= 0 [ die ]
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end: f* I5 v! B% L. n6 E# b
to regrow-grass
' ~7 m. }! U: ?0 q' r$ w, M ask patches [
; E8 z# v; v8 z) ?5 O" V- p if random 100 < 3 [ set pcolor green ]* T$ n& N |& b3 j T5 b
]# X8 B% V( v: }, V
end
& U2 h( y: C0 w& I9 }' ?9 qto do-plots5 o1 Y1 C o/ V# E
set-current-plot "Totals"3 V5 {! j" W+ b6 _) P# O4 @% s
set-current-plot-pen "turtles"
1 z( v2 _4 G. } plot count turtles3 t$ \% E9 G" }. c
set-current-plot-pen "grass"
: \9 V* |) u0 k9 J2 X9 F4 M plot count patches with [pcolor = green]
; o' S' X# r2 T7 H \4 ?end: U: ~! D2 S% V! Y3 ~1 w0 k
可是运行时提示no such plot: "Totals"
9 G' j# U/ v6 terror while observer running SET-CURRENT-PLOT
: P% Y3 S8 q5 K/ X, t! _7 m called by procedure DO-PLOTS
- h( z2 W$ C+ ~& j called by procedure SETUP, s d8 V: V* c' g
called by 按钮 'setup'
4 g" ^9 ?$ Q! q' N求大神解答啊 |