我编的程序如下turtles-own [energy]
- C8 i1 I f0 t/ |3 @to setup
) {+ v6 Y, k( s: i clear-all
; I3 j5 B2 m- [/ F# q setup-patches
7 Z& v. f: i6 z, V% |$ J4 g6 S create-turtles 1007 U% l/ Y# @- e0 V* p6 s: B
do-plots! y% P6 U+ y6 a" c: S, l1 V( n
ask turtles [ setxy random-xcor random-ycor ], w0 A$ |( Z* C0 S' U
end, ^: U( b% ~5 l: H _
to go
9 _0 X) d+ S: N7 G move-turtles
- c3 Z6 R% r3 L eat-grass; {3 \6 u6 M' [0 l0 A
reproduce
$ b: S d/ E1 A1 u* N. C check-death
: ]- r& Z# n4 a. l* k regrow-grass# a. o0 D" [6 b& q6 h$ Y) J i
do-plots
S3 B9 ~ r9 }! _ uend6 C. |. T1 p" b* E* J; F: E# @
to move-turtles
' V0 k6 ~: a$ ?8 g' b ask turtles [ N; o+ x9 m3 F8 A* t
right random 3602 o& ]7 z9 N/ U# X2 I) P
forward 1
& W% t. E' ?$ t2 U4 ]6 u B; J set energy energy - 15 |/ P) k7 I# A r+ A
]
v$ b$ B9 B. x! r: v9 Vend1 H+ b1 n% N2 Z3 q% h8 F% E+ g/ n7 O
to setup-patches. K1 }4 ]& t4 G7 j$ S; B- f
ask patches [ set pcolor green ]9 f4 n# Z+ m9 r
end$ |& N6 l2 J T. X. J) T
to setup-turtles
3 }- f; [" U) I8 M c6 q create-turtles 100
6 _+ G( d C8 L: c3 l1 x; s' c ask turtles [ setxy random-xcor random-ycor ]
/ c6 U v! g+ i% V9 c& R' ^end& ]- W3 V+ I9 r, W# ~( W6 O' w% N, L
to eat-grass
. Y. }( f( s( h+ ~0 G ask turtles [3 R( }$ o* b8 t; t( U: E% V7 ~
if pcolor = green [; L. c9 Z3 t6 h4 Z% K7 R4 w
set pcolor black3 K' W5 e: K0 k8 @/ k0 } S/ [. `
set energy (energy + 10)# ^ g/ T: v# O. ^. H# a5 e. r' ~
]( J4 Q- O0 [# w. d5 m8 {2 O! d" J
ifelse show-energy?& S5 O( I' q$ M
[ set label energy ]6 G9 }2 G. B/ \: j9 u
[ set label "" ]; U$ \# M0 X! s* c. D% G9 O' ]
]
/ j; g; f- Q* pend/ D5 X i% C! Z( H) F
to reproduce
' K8 T4 B' G- m: P ask turtles [
' h; i& O) W+ O2 f8 n$ v if energy > 50 [
' K! E( [" Y3 v n) X8 k1 V4 x" p8 w set energy energy - 50- X" a6 d/ q0 Z) g
hatch 1 [ set energy 50 ]
+ e8 Y/ Y6 f- m6 b! M( c ]0 h! h; f m |+ m/ P
]' u. D! X( H2 L# K
end
2 j" ~1 X$ X5 t/ Y; _2 Yto check-death
+ U4 x) v B7 }$ z- `% \ ask turtles [
# r- ]6 [2 q- W0 j+ m7 m if energy <= 0 [ die ]. W8 G$ h2 C7 f) |! ~1 `
]
4 J7 t( d/ ]! S9 l: A! Uend
4 |' x( W( @4 K7 vto regrow-grass, Q* q0 v$ s! K! P7 f# B
ask patches [' X+ D: q2 Q4 m- P* \$ h
if random 100 < 3 [ set pcolor green ]' {7 H) Z& v+ z- T8 S
]/ G1 @* r+ K: N: R& h9 A/ }" R
end
* O4 ]5 \/ M& t% j Zto do-plots$ B; f* X8 A& d& [8 A; B
set-current-plot "Totals"
$ m3 d4 y4 y9 |. r+ G1 v set-current-plot-pen "turtles"
* q1 t1 M9 f$ O2 b' h plot count turtles
6 y; e. v9 P- _ set-current-plot-pen "grass"
1 |: ]% g% _1 f/ ~ b, r plot count patches with [pcolor = green]
9 |" Y( _1 Q9 c5 x& [end
: A/ p+ t" {- u可是运行时提示no such plot: "Totals"9 L% h% k2 Q$ n% t/ [* D2 s
error while observer running SET-CURRENT-PLOT) {' \5 u! m6 r& q7 b' n, ?; _& A; p2 D
called by procedure DO-PLOTS
8 b& A. _) H: b2 d0 L _4 i called by procedure SETUP
# \' I* l; `: r( u; z, ?& x( ?6 b u called by 按钮 'setup'5 F) v# M- [8 J4 x- X
求大神解答啊 |