我编的程序如下turtles-own [energy]8 l( r2 w- c# l/ d# H' g
to setup
: W( B" C; s, D6 y6 p. Z& z clear-all$ H+ T0 k0 D3 V" h1 W
setup-patches$ R! ]4 X' ?/ v1 p% s6 p* y2 M' g
create-turtles 100$ Y+ t& s& v- q; ?+ j7 v7 Q8 S5 [& c
do-plots
1 e1 L+ Z+ ^) X M. Q" \ ask turtles [ setxy random-xcor random-ycor ]9 y5 k! {, b- [% X- ^1 O
end
* U% G, O i4 F$ A0 r2 K; Rto go! H& X/ p* a+ }8 z/ O7 r8 X
move-turtles
4 g7 \2 ?* m. l8 O$ _9 w. W eat-grass( E" t# B( G0 }9 ~ s
reproduce3 \6 |6 r- C; V; t& ^# q4 D/ A8 c
check-death0 ~0 E6 y) m; {6 u, y
regrow-grass0 O' a8 x9 T9 ^* d
do-plots
: ?" [( S% s6 F7 D" ~end
& I/ ^$ _1 E' s2 s! D. I1 }to move-turtles. |) |3 n- h6 e' O
ask turtles [
2 k+ k0 D* D7 R8 j" b4 I right random 360
5 ~1 m& ^: j" R5 a$ z% D2 m forward 1) n! A0 n% A8 a5 x
set energy energy - 16 W X2 s/ {( E3 _4 N
]
5 Y3 O/ y5 S' n6 |# g6 yend
3 y5 {/ B9 |8 S9 m7 i" R% ?to setup-patches
3 m+ E2 F, M3 o' d0 p ask patches [ set pcolor green ]* e% i5 u! U7 ^" T3 [5 J
end
) B6 V$ e& S4 Z1 \3 ^3 @to setup-turtles
" N1 S. j8 g8 e# d create-turtles 100( Q, K1 Q! D2 {0 s8 s @; h% v
ask turtles [ setxy random-xcor random-ycor ]9 ], D6 i$ f: k" }' _
end1 \; d, _/ b, w" i
to eat-grass! u1 q4 X' n4 f5 W. R
ask turtles [/ t6 ^, a( b2 D' @
if pcolor = green [
+ r' G& z) m% G D0 W- ~3 ?7 i set pcolor black
, P; H g; j9 F1 R6 L9 s set energy (energy + 10)6 x/ S) P, G3 Y7 D
]; r5 u8 D7 o' o, s8 B. m* M% v
ifelse show-energy?7 ]; S# ^4 X; b+ M
[ set label energy ]
& q- A5 Z$ c/ t- S% U3 k [ set label "" ]* H6 { a5 A; j2 `6 @/ t
]5 L. u1 V8 b/ T! f/ T @
end
, h5 t4 Q* `. a8 e3 G& S6 D3 y0 Dto reproduce
- v: R' _4 q# Y1 G3 G T ask turtles [
/ H' L& _# H7 C8 I k! u+ E if energy > 50 [; F ^. T j( d) E7 y
set energy energy - 50
& S7 m3 N/ N( ?7 C hatch 1 [ set energy 50 ]
9 ^5 N- F! ?5 F& H ], N1 S, i+ T% F8 L6 B
]: t- z3 L1 k; d- ]3 c* d' U" e
end" H9 P& y* I/ n( x! J1 m9 G
to check-death
7 g; K4 G d4 r' V ask turtles [
) F5 f; }( W- d U1 X, X: B7 d if energy <= 0 [ die ]$ i* ]2 ^+ e# V; ]
]
, Z' G% m* d) Y3 hend5 v _ V+ E8 ~5 F" e
to regrow-grass
, y1 B4 x, F* w+ l# m ask patches [9 a( t4 k. @6 W- _( F& [' f( C* z/ f) y
if random 100 < 3 [ set pcolor green ]
" H# x. K6 w$ g* j1 I1 [ ]7 D$ b9 f S! X# M( g9 G
end* z5 q# B$ S& r p8 H
to do-plots
" m, p( J G# L* x set-current-plot "Totals"
; B h4 G/ ` M( l set-current-plot-pen "turtles"+ \4 a, a0 e# O4 o- j! K3 }) K
plot count turtles
3 ~$ B T3 Y Q2 R2 G set-current-plot-pen "grass"
, g5 ]) d4 X! ^' s plot count patches with [pcolor = green]2 R6 C$ `) Z: r+ |% L6 r q( A" w
end0 n0 q" V" i @$ _' j) p
可是运行时提示no such plot: "Totals"
/ L8 Z0 W3 U1 b9 Berror while observer running SET-CURRENT-PLOT
( P7 o8 w3 u2 a9 l' ^2 a called by procedure DO-PLOTS
# s( Z6 S. u# v& F called by procedure SETUP6 b9 Z s& d# v: `/ N
called by 按钮 'setup'; t q1 l/ K8 f4 {, @# A1 f, F
求大神解答啊 |