我编的程序如下turtles-own [energy]: S) ?! k5 @" n+ {- f. @+ F. o
to setup, R0 c E- d6 p
clear-all4 N) j8 a, @0 _& W
setup-patches
) H5 N A3 ]+ s% G create-turtles 100! X& P) X% F" T* q
do-plots
& X0 z0 I; ?3 ]8 k4 K ask turtles [ setxy random-xcor random-ycor ]& y6 f2 K% _* Z v8 h; X- P
end# k$ U; [* x. n0 t( \4 y
to go" M% }* I2 n( p
move-turtles
; c: {$ e$ U1 A: N& O5 o/ \7 s eat-grass' a6 d! h0 B$ p% X
reproduce8 w* y$ C: P$ ]# w% p( n# R
check-death+ p) n0 z. f6 S! ~4 \$ ?+ D5 ?
regrow-grass( d3 Z# v, v* _! W
do-plots; \* y3 i! F i" h, \
end
; ]$ |7 K9 q9 N) H- Eto move-turtles
+ ?$ o& n* W. A7 G8 P3 T% a8 v' Y) ], | ask turtles [
% _' {1 ^) z: o, [" M right random 360, Y* ]. Q' h# y, w- B& i% y C
forward 1* t4 Z. \/ q: O& ], {
set energy energy - 1
2 I% `: V4 }6 S% s& k/ D/ Y ]
/ F. z- J4 L: \: ?. u$ f6 G. h) Qend
9 N( w0 w0 ?/ O# F/ E9 g( Zto setup-patches
( j5 g* @/ f; R$ o; C& \$ [ ask patches [ set pcolor green ]
' T; o# N" q8 T! A2 Tend
% E' ~+ e2 O0 G8 l: C1 r6 W6 o3 wto setup-turtles
" Z+ d- H$ j2 [+ C, n- J* k7 Z create-turtles 100
, u. H( P; J' Q; d b ask turtles [ setxy random-xcor random-ycor ]
/ |' }& n0 z0 m* h( {$ Gend3 g$ K7 C- t4 I$ D9 A
to eat-grass" T; D3 |( m$ T& }2 O3 X7 Q
ask turtles [
: E1 _5 F2 K) Z7 e w if pcolor = green [& V0 v7 E4 d7 M' ~4 P
set pcolor black) T% ~' Y r: F s1 n: g8 B
set energy (energy + 10)0 W, @! z, g3 p1 E2 M u+ w
]
! `: o! e& |# ~( V( j ifelse show-energy?
, F6 u. Z O8 e [ set label energy ]
) [# e: r" s$ x6 H+ [5 W [ set label "" ]& n% T8 [1 {' ^8 D* o' Z p" g. a3 r
]" C7 R' I% K9 Q4 M, ^
end
, v! W* M T0 R3 f7 d- [1 bto reproduce
& v7 g8 e: X0 Z& J ask turtles [
, |1 o% K4 F9 h& K& s if energy > 50 [; R% \- e8 S, l& K
set energy energy - 50
% [6 W0 s: Z& g hatch 1 [ set energy 50 ]3 A. D7 g p; \3 T: O C& s
]' F y; n2 T% T$ a- D4 Y" p% M2 a
]
4 T3 o$ U: k# L/ H' M Pend
; h/ u' \1 u2 F, u9 s bto check-death
/ x7 [& T! L( X/ k) U$ a; O" {3 x ask turtles [
V. a5 \% V- D# b if energy <= 0 [ die ]# N$ e0 g0 K$ I* D
]- O( x, O- P- z0 B. ~! ?% o7 C% ?
end% f4 D0 H, G2 q" b) {8 n( g1 _, ]' N
to regrow-grass+ M3 _& J( Z% {7 p; V2 Y) s
ask patches [3 W; S3 w" G8 o: ~( w0 X! u3 d
if random 100 < 3 [ set pcolor green ]
- v* G1 L) n& d3 I5 Y8 }3 O% I ]
' Z* P: \# N! g& c3 G" x9 yend
, J- F; B' d I& \' E8 ito do-plots
! j% f9 L" l1 z# c; q3 `* ~: k: T set-current-plot "Totals"
3 J. b. I/ X% D0 l set-current-plot-pen "turtles"0 |2 t- y3 M6 D. f" j
plot count turtles" K# q7 `, k Y7 Q' t) D( p
set-current-plot-pen "grass"7 _$ }* K, r8 ]4 D9 e+ z/ }
plot count patches with [pcolor = green]
+ b: ]+ ]* `. }& bend+ s) G- ^! a- ?& g* H' V
可是运行时提示no such plot: "Totals"
/ X4 Z8 V' U& zerror while observer running SET-CURRENT-PLOT7 c! [- b' P+ E/ o0 H' P$ e" o' S
called by procedure DO-PLOTS Y' k, |. i# @2 [
called by procedure SETUP+ J+ o+ m& P/ Y; x7 e
called by 按钮 'setup'$ L' F( `4 K9 E
求大神解答啊 |