我编的程序如下turtles-own [energy]
! N5 r# g! k8 x, Q- c, ?2 ]! cto setup( l1 q3 A6 k9 |! a$ T* ^0 W
clear-all1 p0 Z( j, i8 u: t3 m# ?4 E
setup-patches: a) z" u. |) v; E1 {
create-turtles 100
( a9 K3 v! P$ I' j* E do-plots
' C( r Q! m+ k3 N ask turtles [ setxy random-xcor random-ycor ]
0 c- { E+ a; \& A2 Rend
5 L1 V) ^4 W* s4 `, ~) Eto go# W) y( }. Y0 A" z6 r2 s/ ]
move-turtles
" g7 Y2 p$ ~2 K0 s eat-grass; G) q/ Z9 s- N1 M1 }
reproduce6 p, U! C% u. U2 Z
check-death
F3 r3 _" N2 p4 I# X6 V regrow-grass
z" V: \# j( x% s$ S5 I4 f do-plots
8 O" P" P# W! ?/ j" x' J6 f, v Send
`" K* c _, D; u ~1 sto move-turtles
7 k* P( |, G$ g) ] ask turtles [
: S, }) p, A+ [, Z; o; U right random 360
2 g v3 N; f" M forward 1' r _5 L0 o' H, }1 s8 T3 e, o+ ]- B* p
set energy energy - 1
$ j- l' [+ ]8 i) t6 ^" V ]" K! m" Z( L, v5 w5 x3 G7 {
end
7 A( ?( G4 v5 `$ G( ?1 Mto setup-patches0 ^& \! a1 l& a& H
ask patches [ set pcolor green ], l" D4 M2 m6 c+ P. s
end
2 S a& I& _9 ito setup-turtles$ x P. i2 z" P, z
create-turtles 1000 {2 h! p9 K5 u3 Z0 P+ w- F
ask turtles [ setxy random-xcor random-ycor ]9 T( h9 q; I! c, Z5 P
end! R& t( I+ H$ \
to eat-grass) s) V0 ^9 F( o: Z* X& [7 H
ask turtles [
7 }' U2 G& x0 n( g* e" _% s if pcolor = green [
& f% Y. D! T$ W3 w set pcolor black( n8 v- e" P7 _9 }$ E" U E5 E
set energy (energy + 10)0 J* a' p; d. J) K7 U5 ~
]# B& D$ k8 d2 m5 O5 n/ d
ifelse show-energy?
$ D" R2 w6 p; k" X5 d [ set label energy ]: e3 C* |" I( B- V& R# Q4 ]
[ set label "" ]
; {4 c' a+ j( Z% G ]
3 m& Y T9 D& b% qend: H. _& [/ G$ y7 Y' \: j
to reproduce
9 _" [: W5 |. F ask turtles [
8 F9 `( Z# g- T4 F if energy > 50 [2 f5 x& \0 S2 }* f( U I
set energy energy - 50
$ w, X6 c2 [5 N( r5 M hatch 1 [ set energy 50 ]# O! G5 F& z2 ^0 q. `
]
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end
, \# ?, G+ w3 ?( N! T: e& Ato check-death
. K9 ?# x: c3 U$ v ask turtles [! a. o5 h( V( l
if energy <= 0 [ die ]" i" B1 Y4 }; }
]
( a @+ E* `6 K* x/ j) D0 Tend% j+ j# i7 M4 R' u3 M; u5 J/ c! b8 p
to regrow-grass1 c9 j5 z" x, _9 M. _7 y8 G
ask patches [
% i# p5 y8 ~5 } if random 100 < 3 [ set pcolor green ]. M g- `% D- f7 l, ~5 G$ F+ L
]; y1 N3 N7 |6 |# f0 p1 \
end) n3 {, W, ^/ l/ Z8 u. a
to do-plots
0 I$ Y8 z" Z% W* Z/ H4 C set-current-plot "Totals"
( ]" S2 H" K' K& N/ | set-current-plot-pen "turtles". }7 C! S7 h3 w" V( [* e
plot count turtles1 j8 M; g) C3 {' k5 ?. K; ]
set-current-plot-pen "grass"' w/ ]% S3 p% i! \/ X6 O. Y6 G
plot count patches with [pcolor = green]
: v' {- R6 j% oend9 T3 f. u6 J2 g$ X' ?) r
可是运行时提示no such plot: "Totals"
' {, l6 U2 m7 b- werror while observer running SET-CURRENT-PLOT
. |0 v: z1 d3 c$ w called by procedure DO-PLOTS
! u- u0 C! `/ p5 B6 G called by procedure SETUP
' |3 E6 t+ B: {8 v! }1 } called by 按钮 'setup'3 c) A4 t% }+ {7 O$ {" x5 {2 ]
求大神解答啊 |