我编的程序如下turtles-own [energy]( B$ v; Y+ \2 h4 t# J$ m+ G
to setup) e7 W; w; I$ s# q( p+ P
clear-all
% B% t+ i% G% _0 r, @+ p setup-patches7 F4 a/ B9 Y& H# ?( ]5 D% y* o
create-turtles 1005 y% x$ l8 e1 B
do-plots
/ X1 O6 z, ?% J; a4 J ask turtles [ setxy random-xcor random-ycor ]
! F. w" [0 l5 N/ Nend5 y3 a+ e: G; Y3 }6 b2 T6 [
to go- V9 x# Z' Z; e8 T! k6 l# R
move-turtles! @( o3 ~, D6 S& j9 f
eat-grass
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check-death
/ a3 x# q7 z* p8 u% V* c3 h regrow-grass
# _( ^3 F/ A+ T do-plots6 v/ {6 l6 M5 l8 x' N
end
, u; \2 N4 l- t8 o$ W5 U* tto move-turtles
2 V5 ^# j/ D$ }/ Z* o ask turtles [; l1 a0 {3 t5 {8 w8 `
right random 3606 b( n1 W% T5 R7 R, o7 Q- m
forward 1
: [% E2 M2 d' j% M set energy energy - 1
6 J- [+ y2 E$ X/ M ]( J2 K2 ]7 Z; v' I/ `) d
end+ M8 X1 _& r b) c0 e6 ^
to setup-patches
2 W9 Q1 p) t5 q7 s! C3 D ask patches [ set pcolor green ]
! H2 r- }& d% _5 E' _, y5 J nend7 j, j+ D r1 P/ I! V% R
to setup-turtles
8 f5 ?2 H! X6 Z" J) J5 w! a7 P. \ create-turtles 100
: ?- Y. O/ G: i) n$ y ask turtles [ setxy random-xcor random-ycor ]
( l& V6 v9 V1 h4 iend
1 e* Z4 b7 C! k( G! Lto eat-grass+ d- ]9 V2 \) Z# e& M$ K
ask turtles [: i$ h w0 B6 n! M! h5 l. `2 q
if pcolor = green [
1 t# u5 T S8 ?; H% } set pcolor black7 c/ s9 [" t+ n; R" \7 @
set energy (energy + 10)
1 s- x4 ^0 Z% l6 [ ]
5 c7 r! g2 y/ d( q4 h ifelse show-energy?
6 o9 v) U, T( `; A$ }" P+ M( v: r" V [ set label energy ]
, O8 e- l! {2 s [ set label "" ]5 ]$ v) l$ j$ y+ a
]& n- P- [; P" S1 o" i
end6 v( d, i+ s! r! Y) B: [9 v4 n
to reproduce
; T* }1 r" W, {4 I1 o ask turtles [
2 T1 F2 [- n$ q; } if energy > 50 [
# T$ Y% w* X( c( ~ set energy energy - 50- b: T- i8 s$ g$ z: `! K$ A
hatch 1 [ set energy 50 ]/ N5 M3 [$ b% K" f6 N
]2 U8 v. }$ r: P
]
! a* C/ k6 M, Y- F3 wend
0 n6 `7 D6 A! l0 Q9 S% ato check-death9 o( o1 D7 n6 n$ `% F
ask turtles [5 s5 p1 t! i, J, _
if energy <= 0 [ die ] ?; E+ l3 W/ T( @
]
. Z ~. X# F1 O( ?5 x' I7 `6 t# |end
! O( b1 Y/ V: Y7 i. B/ e: P5 Uto regrow-grass
8 S( K6 h+ `# R" g ask patches [
' b/ Z) W6 Y& W0 l8 d1 x: h if random 100 < 3 [ set pcolor green ]" K8 N; D3 x% s
]/ j* w( ?) O! l+ w: a. C- Z
end
7 Q6 @% @/ p" {! {to do-plots w" Y3 l' {+ Y1 p0 D
set-current-plot "Totals"
, v3 q+ _. b+ R k1 j+ L0 \2 ? set-current-plot-pen "turtles" @' I% v9 @$ [. k3 H# i
plot count turtles
, }3 r% X% a9 x8 F6 k$ K set-current-plot-pen "grass"
5 z" ^8 M# I( O. l plot count patches with [pcolor = green]
' n! K3 K, u6 L7 D/ s5 E0 F( b, Dend
3 R1 O$ U# u8 e$ [0 Q可是运行时提示no such plot: "Totals"
4 S1 J( K" t! Ierror while observer running SET-CURRENT-PLOT
5 M% ?5 W( w; x+ Y; s! O called by procedure DO-PLOTS
; Q* O$ m) p9 x8 b' c called by procedure SETUP" _' k/ [. @, e: h5 a
called by 按钮 'setup'$ `: `# l+ c# Y" u
求大神解答啊 |