我编的程序如下turtles-own [energy]4 G. i3 M9 m+ d1 @& R! X8 k2 o8 a
to setup; O& L: n. T f' `& P
clear-all# T& {7 |: u) J' ], P7 t
setup-patches6 x) `; a8 K7 x6 {. M
create-turtles 100
. `( L3 ^0 G5 ~ do-plots
) A: P! T7 Q2 ?& _+ y ask turtles [ setxy random-xcor random-ycor ]
9 H8 D5 k9 D1 \+ c1 k/ i" w* r- yend
; o( s. C, ~1 G/ O! Cto go
& {4 s( S3 r$ {3 K% s move-turtles8 A" l& d1 c; A: h7 ?! b; R
eat-grass
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check-death
7 ]; v' Y# \3 P9 [5 ~ regrow-grass
; k0 H( P/ f+ b) ^ do-plots
& l: q) y: s1 t3 wend4 o+ U' U0 \1 ` w& i; {
to move-turtles- |# e8 s9 U' C; D- N8 u
ask turtles [
3 K9 n: i8 W U8 x right random 360
8 ]0 Z/ b1 b& K1 v* C forward 1
% o( o/ T6 U2 k# E5 b' i set energy energy - 1
5 [6 Q+ e- I6 O" V7 E ]
( Q1 O2 x6 i0 M' m; s6 s# vend
& l: H* G+ X2 d1 j- R$ C. ~to setup-patches
% a [/ n8 h; Q0 Q ask patches [ set pcolor green ]/ W1 R. l5 a2 a/ f" J
end" q3 J/ X+ H7 @5 }5 t7 L" o
to setup-turtles& Z$ e9 g% c7 t
create-turtles 100# j) }1 c: \; x% l5 ~8 ^" F3 A
ask turtles [ setxy random-xcor random-ycor ]
/ S1 G. D5 Z; a7 Aend2 t0 t/ |2 a j, q/ q
to eat-grass, Y2 }6 j0 Z/ C7 b
ask turtles [' T& @" }, c0 R& x' T) n3 I4 _
if pcolor = green [
- F' t3 y7 B: {. N3 \ set pcolor black
0 A( m b3 z+ ` c set energy (energy + 10)
s+ n8 x% B- H: p+ ~6 Z ]& k9 h9 k* C: X) a! u q+ G
ifelse show-energy?
4 q$ z5 ~% x& [3 S8 E [ set label energy ]* w& Q0 ^( e6 { z2 C6 x
[ set label "" ]
, M6 X/ h. a# t0 M ]
1 D7 `% M# `7 f9 s8 {/ _end
3 F. D: m. R1 o. C4 uto reproduce
/ P4 b* h7 s& f$ `) k) n ask turtles [
% e8 I. E5 c9 ~ if energy > 50 [
& ^% b1 v9 B3 h1 F4 w set energy energy - 50
& _& R4 S0 `9 C hatch 1 [ set energy 50 ]) l+ R! ?( S" s+ o+ A3 _; N
]
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end
8 E' C% j$ r3 T- Fto check-death7 c6 @9 J l* z( [
ask turtles [, f; H& N! C+ u+ g+ L" @. D3 Y3 n
if energy <= 0 [ die ]
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end
: c2 }' q z- G' E* N' \% K" Hto regrow-grass$ ~2 [+ G/ o1 L, L) L& d- p( ^6 ^
ask patches [* l# [, j7 T& T) M4 J0 ~
if random 100 < 3 [ set pcolor green ]
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end# v' f) s8 @8 j9 Z6 [
to do-plots- s9 L1 `; N( a+ @7 V& u1 }
set-current-plot "Totals"
' R7 N1 G. l: V" P. k. v3 @ set-current-plot-pen "turtles"+ O7 x$ `+ J( t* I* w- a. _
plot count turtles8 |- x& t9 V1 E! X) N2 ]
set-current-plot-pen "grass"
$ l, |; N* U0 q plot count patches with [pcolor = green]" H9 [; K1 M* L* k( [! k9 V0 Y
end
8 e! B# w1 l% f( r. }1 r i可是运行时提示no such plot: "Totals"9 m; Y! u i: b8 g; {% ~+ w
error while observer running SET-CURRENT-PLOT
4 O# P) f( M9 c5 h: W called by procedure DO-PLOTS
& f( W0 [8 M3 E1 C called by procedure SETUP
0 L, F- w6 Q0 E0 W5 W) ` called by 按钮 'setup'
, f1 r5 B% d C/ ^0 Y5 m2 N求大神解答啊 |