我编的程序如下turtles-own [energy]
7 b( B! o8 P# w3 ~( fto setup
! K5 e2 k- M: F6 t clear-all& E# g1 @; _: H2 s4 }
setup-patches% k; y& B/ L+ |4 I# i
create-turtles 100, z6 K. D+ y# E. n' S
do-plots# N# _) g& U+ `( [
ask turtles [ setxy random-xcor random-ycor ]
* m/ X+ }8 {4 C. Q4 \: W" v, zend
% Q" ]) i, Z# ato go0 T: L5 @& ` {2 e/ {
move-turtles
9 Z3 C0 D7 }8 ?6 \ eat-grass
4 b1 q6 t5 U6 o1 m; b. Q reproduce& v$ d: P9 }& x* c2 E+ V9 n# q1 T- M
check-death
) |9 o `7 O% X2 b2 v regrow-grass6 h* |+ `( h. R" c" q; q! v
do-plots) C" s' k- {! Q) D
end
; G" K+ l. g# Y( i) ?% ?/ |to move-turtles
$ j+ n# Y; h( q( y+ G ask turtles [% q- N i* l/ G
right random 360: h+ i. x1 V' `" P8 t; k) a6 h
forward 13 `2 n+ C( L4 ~
set energy energy - 1
+ U. \6 O9 s( p8 z+ J2 i4 S% s ]' X* A+ s; h/ T- E0 a
end
, W6 A) \' M7 C8 R) A- K# r; {+ k% E2 d/ b4 Uto setup-patches
( w1 C; Q3 a5 C6 }; b; Q$ l4 w ask patches [ set pcolor green ]
, k1 _4 y c) } F) X% V% Lend
5 A4 v2 a4 p8 a4 ato setup-turtles: I t& A" p5 c P- `. j
create-turtles 1002 E8 J/ I! b6 H9 u; k9 b' Z+ r
ask turtles [ setxy random-xcor random-ycor ]! v4 o/ N' H+ s$ x/ r! g% g
end
; v& x: @' W" t7 c0 b7 \; l5 Wto eat-grass4 G/ T) @: [* A' h1 ?
ask turtles [
4 v- o* r i$ b& s6 {' [ if pcolor = green [+ Z$ u: S' A* c; x: \" r
set pcolor black
" N- P' {5 ?3 g/ G5 \ set energy (energy + 10)% j+ @8 N+ N3 d/ [$ d! P: G G$ p
]
$ O4 F+ q9 c2 v1 G+ m7 w0 W ifelse show-energy?
1 {) \$ S3 x1 k3 k! ?& D9 F [ set label energy ]
1 U- q3 u- a$ w% X# [% H4 _ [ set label "" ]
- @# f; B9 s- h5 c% @# f4 }- E ]
# G& C0 _% M3 I( o: k D. F, {5 kend
6 P) \2 g. y9 O, k ^( jto reproduce2 L+ X/ o. w9 `/ i1 E/ F
ask turtles [* G3 r; \" R1 P! S. |2 k/ R
if energy > 50 [
4 P. U( @* d/ m4 p" F set energy energy - 503 }# j- f) d; [6 G3 `: ~
hatch 1 [ set energy 50 ]
4 S- i4 `& M4 j2 [% W, ]8 B6 d ]7 @' y+ g& f. ^6 E& a
]0 T0 i+ [# T' g" n* @/ ^1 E
end
/ N6 Q6 C H- k# D2 r7 K0 X3 Zto check-death
p7 A3 J, t( a, R: b# [: ~ ask turtles [& n+ q/ A+ y m; @4 F
if energy <= 0 [ die ]* ~; A! \# N6 y
]
% e6 T9 B( K5 U- Fend6 M- B. v5 Y3 E+ U. W
to regrow-grass
# @7 k; H* N$ T. D+ T9 { ask patches [. T% I9 k5 P3 n* Y }/ T
if random 100 < 3 [ set pcolor green ]9 C% e1 `: }& x& j8 @2 E) B1 F
]- \( u& d% w' o0 G( }; A
end4 q7 F+ \0 {6 N7 k5 F* O
to do-plots, F) z h6 g. \+ m, R4 A% {
set-current-plot "Totals"
& Y) j, ^7 K4 ], Q/ d set-current-plot-pen "turtles"' m8 K" `: |2 h: d. `# p
plot count turtles5 M7 ~. V4 M$ Z+ U
set-current-plot-pen "grass"
7 l6 w. D+ Y( @ H3 n& m/ V* t) s plot count patches with [pcolor = green]; I4 \6 E" h$ ~( @
end
, L v! {5 D& x9 _8 a可是运行时提示no such plot: "Totals"/ t; h+ ~/ Z' ]. d
error while observer running SET-CURRENT-PLOT, m9 X F" L% n# d. B$ ?' }' P' ~( E
called by procedure DO-PLOTS
8 B/ Z1 q8 k) _5 t/ j% X. V called by procedure SETUP& ^ o- `2 [2 W8 e, ?$ G* v& G
called by 按钮 'setup'6 _' Y @; q7 S
求大神解答啊 |