我编的程序如下turtles-own [energy]( f# {% H' [8 |
to setup
5 k0 X; }! j; ?/ R% Y/ J8 | clear-all
4 n9 X& V+ o) z4 H# i- a9 I setup-patches
! C( l: N% i: a! X create-turtles 100; w& y2 A R( |
do-plots
, h! K' M4 l% L5 O ask turtles [ setxy random-xcor random-ycor ], r* x& }. J, C/ k
end
$ N& o, h+ ]+ }, \" n" w- @: Cto go* N5 v9 C8 W9 g& r. `( b9 ^
move-turtles
* g0 a- w, r: d* z/ E eat-grass6 v) F9 w$ r0 U( z4 Q
reproduce% L+ U+ Y+ H' i- o8 G
check-death
5 l9 ~8 t+ o$ D# `- V regrow-grass& _0 r: O1 L9 d! e0 E2 q+ W/ X
do-plots4 l# K. [: a) T6 V) s/ K9 K' k1 a
end9 d: J# h j" M- W% |2 B! ~
to move-turtles
4 J7 k2 a+ @7 x2 ~: S4 G ask turtles [
, N; ] I h+ x0 q right random 360
8 j) G! S+ o# [ forward 1
?7 t4 E* l8 z( V, V set energy energy - 1
8 }" Z( [0 E( x4 v6 I ]
3 O( V: Q/ T2 ?4 [: y+ |1 e1 S. Vend
* ^! i# W, P" h4 v/ xto setup-patches p# _$ C/ e9 }+ ~" t' z
ask patches [ set pcolor green ]
9 ^ E) d" C& b" ]+ \6 j. C& eend
6 w' Q. J: C/ x7 g9 {5 g- F$ xto setup-turtles
9 N0 S- H! d: ?+ [; q, } create-turtles 100
2 y0 N/ U! O$ n# ^ ask turtles [ setxy random-xcor random-ycor ]
9 Q; U4 w0 c6 D9 wend
9 K1 P1 F, U1 K7 ?to eat-grass
3 \8 O1 }4 z5 }- @- I) M1 _- J6 ` ask turtles [! i: a, z0 V0 O( q
if pcolor = green [
% x$ D9 H$ N" ^$ L+ `( ~ set pcolor black2 Y4 \1 m- F& g: V4 a( s3 C9 ?
set energy (energy + 10)7 K1 O: q$ e% x
]; e+ `' V+ U% N+ g
ifelse show-energy?+ k/ T" ]3 H$ H; I+ u6 j; \8 g
[ set label energy ]6 H T- p2 C: a+ j9 l, ^8 ^' y1 z
[ set label "" ]! o% E. i' G& Q' S
]
* ~* a+ ?$ i/ |8 Vend1 Y; q, F$ W$ \8 ?5 w
to reproduce, ?5 H7 S5 T# [: e: D) H$ k
ask turtles [
, ~8 B) e% S2 w3 ~ if energy > 50 [
' `- m( V9 d2 Q7 F( E set energy energy - 50
9 }1 [9 x5 h- ?+ M5 \' i! A$ n hatch 1 [ set energy 50 ]
6 h; a: r$ g- m3 N, i0 p ]7 I4 C' C5 v) F0 ~4 C
]
" T% N% T8 q9 o. Lend
2 B2 Z. ]% {& ~5 `1 Lto check-death" [5 X+ l* G H" O
ask turtles [
' @2 D! }; N2 ^$ R6 F" G: q if energy <= 0 [ die ]
* x3 }- `- \1 V5 M ]
6 M* e2 d: b9 L1 Eend7 V5 H M/ S3 r6 u. n, s( _
to regrow-grass
0 R+ [; K2 J6 ]" y. X ask patches [" P! ~( e" {1 \- _3 X
if random 100 < 3 [ set pcolor green ]: Q) Q# U0 M6 G0 O; t
]
7 i5 k1 G7 P7 M ?9 v% p9 b) u$ send d ^1 @2 S( c
to do-plots+ S* O8 b5 l8 j2 J; c
set-current-plot "Totals"
! K/ Y3 z: Z) m: S' T7 }0 B set-current-plot-pen "turtles"; {% k8 |7 u6 b. C) v
plot count turtles' Y# Y( [7 ]- j6 ]0 ?( \. s/ `8 P
set-current-plot-pen "grass"
. u2 \- H; X+ x0 i3 ? plot count patches with [pcolor = green]
8 r- n6 b0 _+ ^: Mend" E6 i0 S( W- T* p5 T
可是运行时提示no such plot: "Totals", F. s7 r+ B$ h4 g2 w) r- G# d/ q
error while observer running SET-CURRENT-PLOT# I7 n! R5 L4 L" _# c: V2 R Y
called by procedure DO-PLOTS
W6 f8 o7 h# Q; n called by procedure SETUP
; Z3 ]# Q6 S: N( y& o called by 按钮 'setup'
. k, Y+ P. M! B6 a+ T求大神解答啊 |