我编的程序如下turtles-own [energy]
' P7 M" z: \/ [to setup
{4 [; v$ Q7 K) R clear-all; O# y1 T, l# L e3 j
setup-patches% ^' a. y5 l1 u. }' W y
create-turtles 100
; @ @1 L. r1 P$ V, a do-plots
0 b4 z. d! B; A0 v3 a ask turtles [ setxy random-xcor random-ycor ]- i0 R& k# p! v9 n2 [: y9 v: b2 W
end1 m1 @7 k( c9 O: D- v% C; ^
to go c+ y( \: {- O \: }' E$ a+ L" ?/ I
move-turtles
0 H I4 u- D$ z9 j5 m( Q5 Z eat-grass3 j7 _+ Z7 a. Y
reproduce
$ `- ^/ B" _& z' x" I% n check-death# o4 d5 N! J) w4 b/ P3 G0 \# N
regrow-grass8 Z7 i0 L5 K7 [7 {/ O, X& E1 D
do-plots- y- X2 x7 b( s! K4 Y H
end
" H9 k/ x& k. c7 yto move-turtles
# f6 Z* e; a, ` j ask turtles [, ? C( Y8 P% P* |$ b9 m3 U% Z
right random 360$ r; Y" {1 ` e* U' J
forward 1
' A+ ~" y0 P8 L$ j; X set energy energy - 1
% ]7 a8 N u" ]3 i& e; z0 M b" d ]
8 P$ f9 f3 x! A$ C+ D% o( Lend
; N8 L9 S6 J* a, p P4 B# fto setup-patches4 R- I1 V8 P- V/ N" b" g
ask patches [ set pcolor green ]' t: q1 T8 r$ ^; e- c: i6 k& v! r
end J: Z0 _1 t6 n& ~; b! c
to setup-turtles
- E4 C) A- x2 D; d: r create-turtles 100
( y9 J% M+ r9 z/ `+ u* b* M- Y ask turtles [ setxy random-xcor random-ycor ]4 `$ N B* \ `5 J& E% Q
end
' C" y* M' |8 z2 qto eat-grass
9 F, a$ H; b9 v+ ^, z, ?- X ask turtles [: _- {% e. _! S/ R' R* u
if pcolor = green [& b9 r8 z, Z: z: ~. N
set pcolor black
D/ j0 U7 V6 ^ set energy (energy + 10)
2 h. T2 K$ l! I* Y, X& m' b ]. v6 ]2 e" V- c' C. L
ifelse show-energy?" }% P" ^# S) i
[ set label energy ]
+ |& v' G& E8 E" Q; X [ set label "" ]2 \, a7 H- p7 f) C1 O0 B+ @
]
~6 h5 P& b; Cend* N0 X* S+ n$ _7 f- P5 P2 j
to reproduce
L) `) s/ Y& S$ n- i ask turtles [ r; u/ I; u( @4 s% L z# T
if energy > 50 [
0 g3 S% X$ ~) x C set energy energy - 50
' u: s0 n. f$ v2 g4 I' y, g hatch 1 [ set energy 50 ]7 k2 u* [: I7 @8 N
]/ E" e8 m- E1 Q) O: ]$ I
]' J& K& q% I. x2 I6 A. u) C
end7 ~8 W8 i1 D, J: i. v
to check-death
" }' @+ A/ h, C- }) ?- P9 P9 n8 W ask turtles [
|3 J7 j0 l" N4 p if energy <= 0 [ die ]
, Q* {) r7 ^, u$ x0 |; ^# W ], P. }; }3 B# `0 c H- t) d8 @7 h# c
end; t+ x! _6 H( E& }: C
to regrow-grass
$ k: x6 u6 D0 L2 n ask patches [1 g0 ~5 D# D' A7 g- G8 y) a
if random 100 < 3 [ set pcolor green ]
2 P3 f4 c4 Y' B, W ]/ ~& e# N% a# G- d3 P6 @. G
end8 d9 d; I) ~0 \' N6 B
to do-plots
) @; A0 Z: x! o- J# G" E7 I/ b) B set-current-plot "Totals"
; `# S/ \2 m' D% a7 `3 u# E set-current-plot-pen "turtles"
, o( T+ q/ M4 l' z6 f5 P plot count turtles7 d* B& B# p% b
set-current-plot-pen "grass"4 q I/ ?2 o% a1 F6 [/ d
plot count patches with [pcolor = green]+ A9 X3 j; N) _; W& a$ i: I4 X
end* P1 e' L/ W) K3 B6 }. Q
可是运行时提示no such plot: "Totals"& Q% C; S/ U( E; j+ O% f
error while observer running SET-CURRENT-PLOT) X/ p5 y' h+ e0 H" q( `8 V
called by procedure DO-PLOTS0 S4 r+ u Z! [+ ]
called by procedure SETUP: o$ U8 c" J. j8 H" I
called by 按钮 'setup'
6 X/ G4 l' Y% l" ~; u# c& n求大神解答啊 |
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楼主
发表于 2013-5-29 00:25:38
