我编的程序如下turtles-own [energy]
- |: O% D e" \; D$ M+ [4 E/ S9 Rto setup! L! |4 k& d, v) Q2 F% j) q0 g4 w
clear-all$ B4 X" c3 B! i+ b' Y& a6 \5 i
setup-patches
& V+ r/ f: T6 Y3 d7 A+ N: J* ` create-turtles 100/ ^% B9 t( K4 } f: F
do-plots
' E# R" X4 }9 i1 X/ J' N( t6 \1 V ask turtles [ setxy random-xcor random-ycor ]# i- _" @4 F( z* a0 u( ]
end
' t: ]0 }4 z9 s( rto go
; T. H4 V1 D* r3 k* o: N. R8 P move-turtles% y$ T, [+ z/ J; r1 _; e* y
eat-grass
/ K; ?+ X& c: [$ X. q reproduce
2 Q' j- ]! U% V8 f( A/ W check-death/ \1 f; t, [% }! d) H
regrow-grass
j/ x. ]' G5 C) d5 R do-plots
! x0 Q5 Q* I; S, oend
! V/ j4 R% v( ?3 E: Vto move-turtles
$ @. X$ ?) y6 Z( D ask turtles [" w& i; _0 F+ ~4 ^1 W0 \9 ]
right random 360/ E, \, l. V9 y ^8 }7 I
forward 1
6 ~. q# }% h b; X set energy energy - 1
, a7 M* @1 W1 o; v* o- t& \ ]) k9 J5 T6 h5 c6 }' [: W0 k) g
end
& k% s& Y* i* J/ d5 zto setup-patches
' N1 R W1 b+ ], u+ E ask patches [ set pcolor green ]
) \1 P: c: ^8 d0 z$ ^8 t+ h A9 Aend
, w# H: {. E5 X5 t5 t9 p, Xto setup-turtles
7 r% O* Y4 r+ a& I3 z& T create-turtles 1007 [4 x9 a' y5 ~6 |" ?6 \! l3 n4 c
ask turtles [ setxy random-xcor random-ycor ]
( r) P3 N' C; N! xend# P. c% l' g# l. g: B# w
to eat-grass
) E- U3 f1 C4 k \- M9 r U8 y ask turtles [
% H2 s, \/ ?5 U3 S0 [3 P5 V X- g if pcolor = green [
/ c/ L; T- F Q; g% I set pcolor black
' u- r5 ^) \* x; c; [& w set energy (energy + 10)
9 ^5 I- p6 {/ V3 v5 Y: P ]
( Y3 Q: P# ^1 Q% Z& h ifelse show-energy?
4 e4 Y7 W$ v3 N4 |3 |; \ [ set label energy ]
# v3 E% A& F1 y3 J8 N [ set label "" ]
+ S# _" E# z9 j( X3 h0 P& ~$ E ]8 C# E$ L+ \! `' G+ b! r
end1 |" N p1 I7 Z, d8 ^5 B
to reproduce& |- n$ k; Y) N$ q# u
ask turtles [
$ ]/ o6 h, U9 A% _! ^7 Q7 N if energy > 50 [
& a& h8 b/ v6 ^' i set energy energy - 50
" Z, N1 p' t8 W0 O5 L hatch 1 [ set energy 50 ]
, M8 [" ^- d7 E ]
! C3 d6 w; f% o7 W( b ]
' C3 b5 u) Q! F$ T' Fend. s; C/ u; j& e- p& T1 A- [8 V* C
to check-death
, ]1 l/ F& h8 x. ~! O- ~+ `9 @ ask turtles [4 {; J! ?5 o/ _/ g1 R0 C; Z# d7 _
if energy <= 0 [ die ]: a- j1 D& w! @' v
]
; e0 g% v& [; p: ?; r$ yend
7 J+ R/ |( ^6 V$ x: Oto regrow-grass1 I. }% M1 E+ a' R
ask patches [
7 p: f( {; y1 n# ~ if random 100 < 3 [ set pcolor green ]
* i8 R: C' p# [. E ]
, Z5 N1 K/ V, z" q. k: Aend
9 j7 y" J! v1 [. j; Uto do-plots" E$ b5 Y k8 B: v# k# z
set-current-plot "Totals"
* K7 J* C n3 w% J set-current-plot-pen "turtles"4 O1 y2 i. N. ^, F& x2 a
plot count turtles
$ [3 i% Q4 d% D7 W set-current-plot-pen "grass"3 S' ], ^8 f& R/ F, P" B
plot count patches with [pcolor = green]
- Y4 u1 V# k' D# s+ Eend/ z% d" @0 m) D* U' J: J
可是运行时提示no such plot: "Totals"3 G; C/ [6 L% X3 N5 f
error while observer running SET-CURRENT-PLOT9 U6 y0 D! h5 i! o
called by procedure DO-PLOTS# X- [! p3 }) g- Y B3 K
called by procedure SETUP& {0 C9 h! Q- K" \7 o
called by 按钮 'setup'
3 k# g/ K9 Y7 e/ U0 \% j3 I8 ?求大神解答啊 |