我编的程序如下turtles-own [energy]- X; t) Q M6 ], `* g3 F& I( C
to setup' g4 O1 y$ L2 a* A( r7 [2 C
clear-all
1 q- ]9 F5 f1 e# z4 D6 U setup-patches* H" G" v6 V, \3 @! l8 }4 ]
create-turtles 1002 X! p( e, `0 X( b' |: b
do-plots
2 K8 B, @7 y4 `5 D2 w5 ^ ask turtles [ setxy random-xcor random-ycor ]
4 }' E& r1 l0 @% Vend
9 J+ z* v3 R" h; L9 C ^to go$ r( J: ^% U2 r1 R3 a+ G
move-turtles
2 W' E6 m' s# ~) `4 D+ d eat-grass
% q9 j' F. e: J4 `: d reproduce
; I5 m6 @" d* M |+ K+ k check-death }2 i6 j$ L$ s; D, @1 o
regrow-grass
0 S; W- E4 z* ~3 t: J do-plots
* j9 l* D8 Y4 d, Zend; ]5 B3 \( T2 _4 j; [
to move-turtles1 x- Y1 l2 z1 f+ v' Z
ask turtles [
% d. i. Y5 m$ g t) T right random 3601 \5 `# u3 e% B" w+ V
forward 1 |' L6 |. w5 M
set energy energy - 17 i. m; V9 R' M+ e$ Z
]6 C7 V) a5 j) N, d
end
/ o9 W' n9 J1 Q/ l9 ]to setup-patches
" T6 M# Y# N% F* B: Z ask patches [ set pcolor green ]
% d2 |7 f! C. b& cend
9 X" y, C& v3 ^% H% w, J+ nto setup-turtles8 `" @: g0 ^6 l' A
create-turtles 100
6 m0 R* d" V" C0 @ ask turtles [ setxy random-xcor random-ycor ]
! M$ M( C( P% i; }! }( Zend
* R, V! t( M' [. E( y8 {& X3 Eto eat-grass
) I% z3 u& J' E ask turtles [
8 L5 U$ I, h+ W; r, H& z if pcolor = green [( S/ S$ A4 `! Q& ~+ X
set pcolor black; t+ Y1 P( E' p( H
set energy (energy + 10)
, }9 x- n$ e9 v n6 F q/ ]% M2 j$ w. P ]
9 m' H/ u! T8 \' j: z ifelse show-energy?
. x/ v' S' K, \+ i [ set label energy ]
- D( K5 h" B7 x/ y" H [ set label "" ]% E! F. N" \4 Y# n" @$ K) B" Q
]
/ A* O8 A: @: v% D+ yend+ y8 G' S& w2 J! [
to reproduce
" Z! }* _6 `) @. ~+ E( T ask turtles [1 s9 O" T2 \0 C; d1 o
if energy > 50 [
! w7 e$ \/ l8 V9 R+ r2 U set energy energy - 50
( r# U9 `3 J4 y* z5 b5 V2 v hatch 1 [ set energy 50 ]9 I+ _7 p& m$ }+ s
]
& H5 R N+ W, Y! k( B ? K4 r ]5 ]+ f; @+ c# Y* t j
end! Q0 E- x8 Y+ o# l8 c
to check-death5 z C+ o1 ?1 T/ r" q
ask turtles [
' r$ T/ }! q; ~; \+ v if energy <= 0 [ die ]; c; M5 O8 p( y6 x( n* a
]7 b4 O1 n0 P3 f. A% H" S
end
! |( p- d* l: Lto regrow-grass
3 n! l* Y/ y% u% O' |8 N ask patches [
4 F/ K' J+ m5 A1 ? if random 100 < 3 [ set pcolor green ]" B; Z5 N3 b' R0 p# o
]# U1 c6 j/ J; x0 j. ?5 b6 t
end/ ~- V0 @8 T8 o2 Y1 g1 X" q( ~% _
to do-plots% e, X: n/ m8 @8 o# b1 L3 b
set-current-plot "Totals"
7 Z3 V. C; W; H( g9 V5 c set-current-plot-pen "turtles"! s1 q6 e" A; d" u3 o: [
plot count turtles' v6 z. q3 h8 i- B, W
set-current-plot-pen "grass"
5 g: W( d" T2 O; y4 u" a9 G. {5 j) A plot count patches with [pcolor = green]: }! J+ Z* b& y
end" Q+ r! u' x& d/ R. D0 U5 c
可是运行时提示no such plot: "Totals"; D5 w5 N! f U: b, {3 a
error while observer running SET-CURRENT-PLOT
8 K& D6 M( d; L9 P, z$ a, j called by procedure DO-PLOTS
$ c3 A$ l7 v9 X6 r' K/ T5 A9 C called by procedure SETUP( L/ H% h5 r* F/ T( `
called by 按钮 'setup'2 @- w, j; R# }' k( U
求大神解答啊 |