我编的程序如下turtles-own [energy]
/ V& i* l; d# \' r `to setup
* k1 X" E% X" g2 I, J clear-all
( k( K3 m k g9 S+ g' e) n setup-patches/ O" k' ]3 n( t9 F
create-turtles 100* q. X4 B( _0 |* t$ \& |
do-plots6 `2 X1 I) R7 w6 J$ f7 _. V, W6 Q
ask turtles [ setxy random-xcor random-ycor ]
/ y) ], e( r7 e3 h- z, Mend
5 r4 K- C4 I5 H6 R9 mto go
/ f& f! {$ `& \4 c move-turtles
0 m6 j: g4 R* z% U5 x3 w eat-grass; z- @, k. R1 _7 P
reproduce
% x( G8 }: ]# g; m) }+ G check-death1 S; o6 t# ^, F0 i4 H2 [8 c
regrow-grass
& |* ^8 ^; U. B% s, \ do-plots8 R% Y4 K9 g5 F# P2 i# g# V
end
( @9 r* j* u# q& \7 r7 d+ bto move-turtles
9 s. p5 \: Z. S% g2 Z: z; y ask turtles [
/ A' }1 M" n1 p+ I! u/ ~# `# \ right random 3601 I! r# {3 K i2 Q" E* h
forward 1
! s0 ?+ h) ~3 L/ O8 Z' \ set energy energy - 1
; w5 y$ B# [' T: {: l$ ^ ]$ I# G" S9 ]- _1 L
end
. b! T" a7 A4 Zto setup-patches
+ ~8 k4 a$ k' |" y5 Y2 b ask patches [ set pcolor green ]
! R( \2 Y; b6 b7 {8 x2 X# D& lend) m' ^# y' P3 | W3 y
to setup-turtles
: _" k h: y# X0 Q; }6 E! E& o create-turtles 100
& R% j# G1 P3 w/ K, o; ~ S ask turtles [ setxy random-xcor random-ycor ]
5 u3 }3 T9 X! z3 I! O4 m6 S% ]end
4 d& D4 w& W0 b: _8 [: }- qto eat-grass. Z8 e; n1 j, w; q, T: o
ask turtles [
- e5 m. G, r- Z- G( G3 ` if pcolor = green [
$ l1 x8 \' e3 o5 L+ D s9 N set pcolor black7 H6 g4 @9 ^# X3 B5 P1 j: t r
set energy (energy + 10)
+ n5 D. R3 A4 F k6 G: M L+ Z' S3 E ]$ ?- |7 V- c! n2 S7 W; K( k
ifelse show-energy?9 ^3 K5 k+ N6 F$ W; P7 ~
[ set label energy ]& t/ @2 W( p0 s/ }% i
[ set label "" ]8 s- _* i& V+ x! P1 s8 j
]" H, j# O7 x( O0 s: @2 v3 s3 c' T
end( N+ _6 _/ d P, A& F+ L
to reproduce
& }5 m2 N$ T9 m) x ask turtles [8 s+ h3 f" m& s8 N; C: {8 f
if energy > 50 [- ?) ~5 |. d" ?
set energy energy - 508 }1 j- ~% s Z) g( {2 D
hatch 1 [ set energy 50 ]
: y, ]: M* v2 c: s) }8 i ]
# V9 V- [0 j3 O7 Q3 Q ]
}; w5 v( a$ a3 M7 V& e ]- @* l- {end
0 m, h. C1 ^6 `% x: G" A2 z6 Pto check-death
; D$ f; w5 w# F9 t2 N' O$ o ask turtles [+ `6 @3 f+ B9 T1 J" d2 O
if energy <= 0 [ die ]- i- ?0 I; g, a4 c$ K
]
% ^" U/ b( F+ q$ |end( P- y0 k) N2 g6 F# }+ U0 x9 m
to regrow-grass
; ], [8 J0 b) t9 D ask patches [, t u) K3 ?' _& X, x+ T6 D
if random 100 < 3 [ set pcolor green ]- B) s* O. r9 N5 ?
]
/ E% E$ f6 S$ f; D! d- Uend% ]( w% X! H' {2 k; C
to do-plots% j6 V4 |( B8 L
set-current-plot "Totals"
% w, i4 x, p: v+ J* ]: D set-current-plot-pen "turtles"" o6 ] I I+ g O9 s
plot count turtles/ }& o; g4 A5 M! ^) A
set-current-plot-pen "grass"
1 W$ R! Q4 q3 K plot count patches with [pcolor = green]( T- ^7 [; C! V! ?6 B- Q5 f
end! \. O& ~1 l+ r( C1 ]
可是运行时提示no such plot: "Totals"
: v6 j6 ~7 L% I( O" Kerror while observer running SET-CURRENT-PLOT( f0 o, B! m. ]4 r
called by procedure DO-PLOTS
8 [* O8 A$ X$ E called by procedure SETUP: U/ h0 e7 S, i; @, r& M1 o+ ]
called by 按钮 'setup'3 m! a. ]/ R1 Y" e/ ^& p
求大神解答啊 |