我编的程序如下turtles-own [energy]* s/ q0 d0 i* q- a7 l+ c x
to setup* n" {! ~6 S& E" i) B b
clear-all
3 |: Q @2 f, W$ X# ]$ c setup-patches1 m) _) D- o0 w" h- _# u, \- L
create-turtles 100+ J# E2 M& Y/ B) N0 ?' z2 K) o, G0 D
do-plots& @0 h) |* Y6 \) S6 b
ask turtles [ setxy random-xcor random-ycor ]3 O* i' |# T& K9 X
end
4 _' d5 j' U8 \/ Dto go
9 x7 O0 R2 U( C: ]- U% @! s) }$ ^' H move-turtles
7 ~: s! o' T- Z/ S" h! M" @ eat-grass
+ p: b( Q& z) c& F3 S, W) I8 ~ reproduce
$ k+ k. f' r( d; D" i+ r3 f check-death
* B) Y: C4 m! J: W regrow-grass2 ^! C0 ~. H3 X) U% A
do-plots( d) ?( e9 w* F+ h5 Q# l% I. x
end
& [ j/ s& U' G0 a; i8 }to move-turtles
9 F$ e& z; S n% x1 h. K7 | ask turtles [
% z9 @" o2 r7 G2 J right random 360/ @9 w- P9 Q$ z. B# j
forward 1
" l8 i$ C1 G# l) A+ L; n& _ T set energy energy - 1
+ t, j" F& y( Y) z+ |/ I ]- g" q" `( G: s# @1 B0 H
end
1 E" I0 t8 Z8 n& h8 fto setup-patches$ }2 L7 d1 a) X
ask patches [ set pcolor green ]
7 u( [, r9 a& B# {- yend# g* l, o+ Y% ^
to setup-turtles$ `( C/ V- U0 w0 K1 Y3 J( i
create-turtles 100 D4 X! w1 A0 |! Z# `9 }
ask turtles [ setxy random-xcor random-ycor ]6 n# c7 J1 _# G
end
8 b* D$ |# ?) vto eat-grass8 }; j! x0 T& r+ {* s
ask turtles [
# Q# {+ V& b. P/ O5 ` if pcolor = green [
. i% F$ s% P n2 t/ U8 L; N. O set pcolor black) q1 U8 O9 P- j! m9 H2 P
set energy (energy + 10)
7 U/ _& B/ K9 ~7 P j# k* B ]
5 Q: _# H' O5 z+ c, x7 S6 ], @ ifelse show-energy?9 } a1 R9 o6 f9 k+ u( ?
[ set label energy ], E* T: h2 Y: A
[ set label "" ]
- g& C% y/ S* X" x9 v ]
G% D/ ^0 U5 c8 X+ x& g7 X R4 oend# z1 E% I W8 d7 e3 g8 j- o- J
to reproduce4 t' J# _1 \& E5 N3 [$ [9 X7 r
ask turtles [. H* ~$ W. b( T& T- R' J) P6 }4 D
if energy > 50 [8 Y) s3 ~0 j1 G
set energy energy - 50
! c/ z4 d/ X/ U$ k; }2 g K hatch 1 [ set energy 50 ]
3 y. M! D) [; A% |; {. E ]
: L5 v; g. o8 _8 P: d ]7 t. E/ Y+ E6 q9 U! C
end
% {4 ^" z+ Z" D# u& @. |( bto check-death
% p+ i/ L! E* f" h% H6 m ask turtles [1 e, I. I: S5 E
if energy <= 0 [ die ]
$ V7 V4 g( ^3 M* T; E- t ]: n6 f$ J8 d) G+ S1 y
end
2 C/ h7 ~, ?9 h, C9 n. ~to regrow-grass0 m0 g5 _4 M1 W5 T
ask patches [: u0 q* v; P* \ D
if random 100 < 3 [ set pcolor green ]( z- [: |/ A4 |. p) Q: T
]
3 L D% e6 C4 p8 ~' Bend, |4 S* q4 y& p/ M6 O& f
to do-plots
4 M0 V9 p/ |3 W# r( }" X set-current-plot "Totals"- N2 Y1 G" ?. U8 x: N8 G
set-current-plot-pen "turtles"
: g7 A& _! { n plot count turtles
2 A- Q2 c4 N2 ^2 s e, n2 |9 n8 q set-current-plot-pen "grass"! Y; r$ d# T5 E# i, H
plot count patches with [pcolor = green]% E& r% x" h: Q. J& y
end" Q6 z* d4 {$ N6 F# m6 y
可是运行时提示no such plot: "Totals"" f' ~1 M) e! u$ {
error while observer running SET-CURRENT-PLOT
% |# D3 I& U6 r9 H5 p: t called by procedure DO-PLOTS
) i( G' ` q- A1 y/ R! k called by procedure SETUP
3 c& ]3 |5 S" K+ E4 x( z called by 按钮 'setup'/ o7 }# g4 }; N4 o
求大神解答啊 |