我编的程序如下turtles-own [energy]( B6 i# q" G! l: ?
to setup
, W2 A* L- h6 \) p- |1 S9 Z clear-all$ M4 @4 m! ?. D5 j3 H
setup-patches: k1 d. I( E. E, P; x6 [" o h
create-turtles 100: W. a! \1 b! J& |; |
do-plots0 \9 \+ `: {4 {0 R, S
ask turtles [ setxy random-xcor random-ycor ]
+ Y8 p% G6 e. t6 b: N6 A+ Kend: o( H! s' L4 v
to go
: z) }% H' M% _" a5 G% I) w move-turtles) h( b# X c- ^' e
eat-grass
: g* u! W- R1 A! j Z reproduce+ @8 I) i# i7 V) s% P$ q
check-death
9 g) Z8 \7 {/ V1 u regrow-grass2 @ h, J& b, m* k6 w
do-plots
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to move-turtles/ @ J+ D4 F6 V$ ~7 V
ask turtles [* D5 m2 x# G* f7 G9 u; c- T
right random 360& C. @ k+ S: K+ I$ S, y! s
forward 1
5 c9 ]. h) x7 n. t set energy energy - 1; P3 y- J2 G* B( r' }1 d
]
9 m5 u; [) j6 R1 j5 ]+ F: `end$ h/ S0 `' r7 z; r, N
to setup-patches6 v5 u! u" L$ k. Y, k4 T- [0 q. s
ask patches [ set pcolor green ]& m0 y4 M( @" t& L
end
( Y2 {, }& ?, d8 d. u6 C, vto setup-turtles
+ z% Q. y* K2 O2 E# I3 Z create-turtles 1009 m7 H0 X6 a( r
ask turtles [ setxy random-xcor random-ycor ] w) ]: Z4 o& N+ P6 V
end
& c k% _9 e, F2 [1 J) u5 z6 Eto eat-grass
, e* ~& a9 l7 C6 i ask turtles [6 o, h0 ^. q7 k' O- h2 ]8 B! _
if pcolor = green [6 H9 E8 {& |* u5 _" `
set pcolor black" E% z4 b9 Q* `( v
set energy (energy + 10)
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% b& d0 M& {4 ?! O ifelse show-energy?
# L5 h3 U7 H1 _- i8 l/ r& x [ set label energy ]# i& J0 y* i) _% ~% }
[ set label "" ]- _' k8 X1 s% x# J4 m9 N/ H: Z
]# S. u* `6 U0 x. y0 h e
end; F t/ F4 K5 a/ h* n$ b/ X' A
to reproduce
9 K" k* A. {! l* f3 e& M2 b2 { ask turtles [
" S- q, H6 B* J2 M! r6 K o if energy > 50 [/ T. e) o, A$ U+ B; L9 e- h
set energy energy - 501 C% u4 @- s: B6 U3 _4 e
hatch 1 [ set energy 50 ]+ B& H$ R& x$ Q) Q$ D; n
]9 ?7 N6 `9 G4 Z% x
]
3 ^* P# p" V6 e3 L# qend9 h' l: Y) ^4 J: H( b
to check-death; @$ q) q7 W0 a G2 z
ask turtles [
! J3 G+ @* C! ` u6 [ if energy <= 0 [ die ]9 h( G. M! f; e. S0 B {
]
9 G3 H; N% E7 b) {5 m! K0 C6 ~9 r Cend4 _; [/ W) t7 e
to regrow-grass
* ?3 j9 m7 w4 F3 u ask patches [
/ O- d/ B3 ~) m% {: ]4 I4 n if random 100 < 3 [ set pcolor green ]
+ K1 @- s8 ] k ]
& g) q7 Y2 H: B1 f6 V' vend8 n% h( a" v( K$ {
to do-plots
2 |7 ], m- M7 ?1 m& N/ ? set-current-plot "Totals"& d( R9 v5 B i+ m
set-current-plot-pen "turtles"
7 U V3 A+ \( e plot count turtles+ p: X; h/ A" V; j
set-current-plot-pen "grass"0 d8 ^7 W G. G$ c1 W
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"- h' p) ]" C$ p/ e5 {8 j
error while observer running SET-CURRENT-PLOT( g: _8 L. g! ?
called by procedure DO-PLOTS1 X* F+ N3 _* i4 [* e
called by procedure SETUP
8 ^: b: U+ Z! ~9 K& x5 x called by 按钮 'setup'
) G2 E9 O9 |, B: X) R求大神解答啊 |