我编的程序如下turtles-own [energy]
) R+ g) U3 |: V% Ato setup
* X/ d, z [8 Z& c) D3 w/ x clear-all& {0 c( S8 Q$ \! |: f& z
setup-patches2 W. A" E- Z( d* o
create-turtles 100" h! N3 i# E F- f& Z
do-plots$ a0 F7 k$ x) K, R2 `: D
ask turtles [ setxy random-xcor random-ycor ]
3 k% f1 X8 m# {end
4 ?+ E' T6 \5 Z* F* K; Pto go
3 _: C" k' ?! u' a move-turtles
9 J% o0 n. e7 [$ R) H4 s B eat-grass' A$ V7 e! x1 W* ]; [
reproduce
7 D* E+ e8 r Z; E p check-death& ^4 A1 x0 a" w9 B
regrow-grass1 x$ ^8 u+ q, Q# v2 W
do-plots
$ k: a% f# {0 fend
0 r1 C. N2 v5 c, Q; m+ Z4 f. e3 yto move-turtles2 w+ S3 b- X, e7 C6 H! y, Q% y
ask turtles [
' R. H d+ f! t& C right random 360
. v. l9 \2 c& t forward 1
) b) t! c6 p ?8 c4 w, o set energy energy - 1
! c( }) X" s/ G. ^! p, B ]9 k% Q {+ V8 X. [" _9 E. I
end0 z. W% S$ W7 V
to setup-patches9 k+ J2 a, m' C% }1 ]9 J: F2 @
ask patches [ set pcolor green ]
' x6 ?3 p/ U; Y) @# eend8 a% _2 I7 l' S$ t# x; r
to setup-turtles6 n% h4 x" ^& v
create-turtles 1009 K, X& ^6 p' _: p
ask turtles [ setxy random-xcor random-ycor ]
6 L; `8 U- I7 \* U6 R7 s% qend( Y: V4 s- p# G N
to eat-grass' @8 f7 g" [4 I, a9 F; p5 T8 N. n
ask turtles [
# H4 W8 q; U& w6 w" j! K7 k9 v' p$ @ if pcolor = green [( N, T' H6 a G2 j. K9 O
set pcolor black
9 q* i Y+ |* W8 b set energy (energy + 10)$ D$ q _1 ]' C1 o7 E- d
]
3 M; z1 M( [- S d" ` ifelse show-energy?
) W" y" \) ^# d, x {$ f. Q5 Q& a [ set label energy ]" R7 n7 L: C) h N
[ set label "" ]
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( p P$ j: c! R8 H9 m& \( }end
$ P5 }5 v/ m+ ~0 I8 }to reproduce* V& t$ C2 c5 N4 _
ask turtles [
/ N5 V, [) {9 g7 v# `) {" @8 T if energy > 50 [
, J4 c; t* y: H set energy energy - 50+ ~3 ~* W, r) g2 u2 [/ r3 U$ k/ u
hatch 1 [ set energy 50 ]
& n* x" Q L/ t1 S ]
2 d O6 N! J: g) ], \ h ]
5 f/ N, j$ S4 e" ^" Aend; k0 }$ l8 H: R, w8 k
to check-death
' w( R) t z) ~$ I) d ask turtles [
- H7 Y+ \0 N, F( D2 I if energy <= 0 [ die ] c: d! G4 u! `
] [/ T. r' e5 L! L( W3 u
end
' K, E6 l: r1 Mto regrow-grass) _" c. F3 V' I# ~% @& |
ask patches [, S! z" {1 _" l- ^$ ?
if random 100 < 3 [ set pcolor green ]/ V# J) D, k/ T$ p# O* C* a4 H3 b
]
0 Y# u# }2 n! T0 `6 xend
6 r* [: v2 @1 q' R7 v) Q) ^. ]to do-plots
: D, L) ^0 @6 M& ]5 Z/ f set-current-plot "Totals"
: Z3 \6 Y3 ~3 E. L8 T set-current-plot-pen "turtles"
4 `1 P8 `! v# H3 {) k" H" k& g plot count turtles( M. [. r2 y W6 r# y3 N
set-current-plot-pen "grass"1 D' @6 N5 i3 m2 ^& F
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"4 h. ^9 z' E$ X9 k5 y0 T
error while observer running SET-CURRENT-PLOT* i) q6 ~. n6 E% b% J3 [! F
called by procedure DO-PLOTS
7 O$ E& w7 x+ G& C' y. P" L called by procedure SETUP$ E. ]: W. t- K
called by 按钮 'setup'
* a7 W8 u: H4 B1 ^求大神解答啊 |