我编的程序如下turtles-own [energy]
& | q2 ^5 [; B( ?' E: \. T: {to setup! p% {7 m( B4 [/ S( T. l# _
clear-all
3 t) V& B1 Y: r1 L! N setup-patches
7 ~) L3 B8 l, {3 X$ ?$ }( |5 F create-turtles 1000 u; a3 m5 Z& K# n
do-plots
1 _2 H. k5 G% }6 E6 i7 Y: Y4 ~ ask turtles [ setxy random-xcor random-ycor ]
+ `( K4 d+ Y$ lend: z5 m: s# x: O. V
to go
k' x* ?6 Q Z; H move-turtles) n8 X# m: G2 s9 W, m* ^
eat-grass
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check-death
4 k" w+ \# Y1 \" O; D, v regrow-grass, _) l2 Z7 W5 G3 f+ x
do-plots
! o/ U2 b6 j* z$ }( ^6 p* Vend
9 f- X7 d2 O7 U3 a7 T* @to move-turtles; O+ [$ A; Z5 n- n$ v% E+ ~
ask turtles [
: j, L: j" [1 D$ d) B right random 360$ `. X$ k* p9 q0 L3 d
forward 1/ ?1 t0 D) t) D2 \
set energy energy - 1
5 w. a1 D6 C1 V! E4 T ]( S( u3 r2 ^/ E% |9 |
end" C7 ~1 {3 w7 _% k6 [1 A+ n0 Q
to setup-patches. V3 X/ r+ ^+ H& t) ?
ask patches [ set pcolor green ]
% R8 u& u, w8 D4 ]( T- @end
8 K0 d, g5 ]# E2 Mto setup-turtles4 r f5 ?& ]0 |: W! [1 @- |' {
create-turtles 100
0 P6 R* Q; ^) w( X# e ask turtles [ setxy random-xcor random-ycor ]
, e' \! B7 K( T5 @end. A6 N7 o5 E8 ^) ?
to eat-grass0 k! U: U: u6 O) ?% I: K
ask turtles [+ ^" t* R# i, |* e" q2 H; M
if pcolor = green [9 r' q' o0 X2 x7 ]
set pcolor black
/ P8 p) X- F' n0 q6 e set energy (energy + 10)- } z1 L7 J. h. f j+ z8 ^
]
2 l( `1 D0 I5 {& p/ T ifelse show-energy?
$ l1 I" ]6 D: C [ set label energy ]0 w( v4 K6 j2 n- I8 t3 c
[ set label "" ]
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end! ?) N( b4 `+ @& k# {+ Q9 a/ P5 x
to reproduce7 Y8 W; ^; X% N8 L
ask turtles [6 |' _ W% Y+ Q8 J) X: B/ C( p# s
if energy > 50 [: i+ @. v3 f3 \3 m; t# y
set energy energy - 50
1 s# G+ F r# p6 V hatch 1 [ set energy 50 ]2 l. Y4 E4 a% J1 N! ?$ K$ |
]
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end
- n: L4 y% ]* ] I2 c Y8 l* _" Cto check-death
7 u. R/ I" V$ h% w" b- ` ask turtles [/ P( I! a1 k. X+ [+ c0 y
if energy <= 0 [ die ]% P# J; I' E2 F j2 v
]# H' f: A8 d, b6 ~$ g* I
end6 q7 t! n3 L" v% L/ R
to regrow-grass+ X5 j/ J( z/ [$ X* R
ask patches [8 l6 F9 v) P& b/ `! z1 t( x
if random 100 < 3 [ set pcolor green ]( L# k# |% U& _
]2 M8 `1 g* `0 i7 P3 J
end7 _- R [7 {0 q& [
to do-plots
. z9 O5 @7 \3 d C set-current-plot "Totals"
) `! Z9 j9 c u- z! I# N5 z set-current-plot-pen "turtles"
; m# f$ j3 Z1 A! } plot count turtles
- S& x/ K* e& V8 N( E set-current-plot-pen "grass"
# g4 |7 ?4 T$ H/ t( Q& h plot count patches with [pcolor = green]# i+ \% X. ?- p
end0 L w+ c& n m2 L
可是运行时提示no such plot: "Totals"$ B- n& `' Z0 K6 x, A) _& s5 p
error while observer running SET-CURRENT-PLOT$ y [+ X; a" O5 a
called by procedure DO-PLOTS# `' I; d* n9 B/ U
called by procedure SETUP
6 a! ?3 L7 h6 B called by 按钮 'setup'+ ~- C2 B; x( o9 M4 v1 r5 D+ y
求大神解答啊 |