我编的程序如下turtles-own [energy]
$ n# v% O- F6 u: ^to setup
0 n8 Z) s% L) p( y4 J. J# T clear-all9 [4 n+ Q3 p+ r9 k* y1 z$ ~
setup-patches( ]0 ~* Y- a+ C
create-turtles 1009 u# m, E' i3 \! o1 R
do-plots
% ~+ G8 Z U4 w ask turtles [ setxy random-xcor random-ycor ]
+ D- h2 H. _% J! Z: ^6 zend
; G3 \4 l5 a2 Y# \- J3 w i# cto go. E; ]6 u7 O) B
move-turtles7 e- K4 K- n) v7 E, Q" [
eat-grass
) V7 ], A. D7 L: G, F2 { reproduce
! r. }6 m) ]# `6 A check-death9 m$ l' I' O8 J1 ?2 L0 C1 S
regrow-grass1 d* P3 C1 ~; i" P% j; R2 L9 G
do-plots
1 U5 }. _7 x+ d8 w: I$ Q' Nend
, Z+ K Z U! u! w! Yto move-turtles
9 B: H4 _6 }) A L' F3 e ask turtles [
, y, T2 z# H' @4 x right random 360
4 N! z( d$ J5 r6 T. P forward 1
" C; V: c) m1 C: G% E! U S2 r set energy energy - 1
) O* Q5 Z6 D5 I- B1 A! V, u ]
9 r, v5 w, p1 ?9 |6 [end+ u2 y% m( `, ]# I
to setup-patches
2 A8 ] M" f; S& A+ S ask patches [ set pcolor green ]
- \9 n% h1 J; I a$ aend- x; r: F0 e4 N Q
to setup-turtles" Q* f6 K0 c: S! m
create-turtles 100. a8 t( `; ^* \ ?7 c. G
ask turtles [ setxy random-xcor random-ycor ]
8 h* L Q$ W2 W. \6 L2 h. pend: |# d! ~4 {. c* v1 t
to eat-grass
3 a, V5 n% _& v" p/ M& q4 e# J8 A ask turtles [$ {$ v- o2 U! X. \. u
if pcolor = green [0 }) @6 n' @/ p2 P0 e: S
set pcolor black: \5 n4 X5 r& W& ^. Y q
set energy (energy + 10)" B; ?. ]! h) w( y" j3 U
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ifelse show-energy?/ g5 }' [. x! a+ @ k+ L' D
[ set label energy ]! [2 @3 K2 q/ \
[ set label "" ]; ? `' g9 r, h" F+ E
]
5 Y( V. o, X$ \" c' B3 D3 D, o, \end
% D, g% y' ]% _: j( nto reproduce
+ [2 y/ B! ~- I: m* O' i7 r% A1 d ask turtles [
* x+ J& n9 A7 k& R if energy > 50 [0 S, B9 z0 H, {, D! w) h8 q# ?2 s
set energy energy - 50
6 @0 p2 e- z1 V- I: | hatch 1 [ set energy 50 ]
0 E" C. J# n) a3 b! u. d8 Z ]
- G* f; b4 I8 B: f; u# i ]" u6 f( o2 L4 M' P; [
end1 r; |' D5 I1 f
to check-death
' D7 l) X0 ^9 z) `& C ^' Y ask turtles [
; r( p$ v; T2 f1 m0 g* k- B A y if energy <= 0 [ die ]) e* X! \8 n7 y
]
! k7 f8 Z* h# }8 ~' ~( n& c4 Mend
6 `) o* U4 a0 m1 u& O# [to regrow-grass
4 h& o: o0 C& e3 ]# r ask patches [& P4 k& `! s' B
if random 100 < 3 [ set pcolor green ]/ V: n# G% X0 S, v! l. d
]; _1 A: ~: D) F6 a
end
+ W, t& p/ Y' [" |' }! b5 g9 \% Pto do-plots
" o8 s7 Y2 w8 W' G9 S+ s! m) Z) k5 P set-current-plot "Totals"
7 C+ }1 T) a* \$ n$ Q- v+ u% J set-current-plot-pen "turtles"3 d5 u0 o, I! A) C
plot count turtles8 i. y& @1 [, |; j. j' r
set-current-plot-pen "grass"' r- ]+ R0 y' |+ l! x0 Y% K
plot count patches with [pcolor = green]
% P4 z! S4 P/ M. [7 `end& J# j9 i2 t4 {0 a. h1 i* G0 p) h2 K. q
可是运行时提示no such plot: "Totals"* B. @6 C8 _! l" p( R
error while observer running SET-CURRENT-PLOT
( G! G6 s9 P+ a, J1 R$ N( X called by procedure DO-PLOTS- r. v9 g% l; n5 A$ [; ]
called by procedure SETUP
8 U z: A+ o+ v, r( b8 K5 l called by 按钮 'setup'
8 v0 X2 U( d0 X- Q) p求大神解答啊 |