我编的程序如下turtles-own [energy]! ?! _# M! z! F$ d# P. I
to setup* G5 n! n4 \3 j5 e7 `& m0 F
clear-all
1 H8 R% c' P* g& M _ K5 K" W setup-patches/ O- _6 v+ J! f
create-turtles 100
. X/ p4 [. x. V$ U, t6 C do-plots5 ^ S2 J4 D0 U8 t! e( _/ h* A. S
ask turtles [ setxy random-xcor random-ycor ]- t. x" i7 _ Q' O& h
end
" v- Y% m- I: v0 g: m, A7 Wto go
5 I9 x$ e7 V! w# a) d0 z move-turtles
4 \2 C" @0 Y" z2 ]# J3 W eat-grass
7 Y6 m& d$ f; D3 ?; _3 L- ^ reproduce% A R% j0 o {3 U
check-death9 W: }9 J6 R, H# ~ ^6 c0 Q0 a d1 E
regrow-grass
# u8 A/ X! W: [* O4 f: M6 ^9 J do-plots
6 _; h9 ~% x$ J9 d {. \end
$ I5 K3 g* X# k! z8 | T% dto move-turtles
* v! v" K- L8 A% I3 u: q9 t% \$ z ask turtles [
0 [1 n" Z F9 ^' y' w" a6 a. O right random 3601 d8 [' t/ S2 }8 l
forward 1 M: c. m9 q1 U8 T8 K/ R5 y
set energy energy - 1
) x! q+ t# B1 k* D$ T& h2 P ]
4 a8 B6 C! Z! T+ J1 L* P, ~end
0 d$ {6 V6 l' d$ Y5 s/ Bto setup-patches, t& |0 E% Y/ e5 C7 u6 C3 |. M
ask patches [ set pcolor green ]
! y; x4 H3 w0 gend
6 d, K9 L! \( h8 N' b& k# ?to setup-turtles! X% D6 b" v5 G- ~5 Y+ Q4 H% _1 B% G* ^
create-turtles 1001 q) r. J, m- W
ask turtles [ setxy random-xcor random-ycor ]! O3 h7 S7 N' g
end2 M, v/ z4 c- o( X
to eat-grass
# Z7 ]8 |: j [' J# s2 } ask turtles [
y/ |0 Z. ]6 O9 `) x: e if pcolor = green [
( K- R3 S8 j8 l$ I# f set pcolor black
1 j$ D, `7 R, d7 U set energy (energy + 10)* ? q# A2 Z: { T" |
]
. t5 u( D; R5 ^4 i2 l ifelse show-energy?) N" I6 a, M: G' I, V
[ set label energy ]
0 \( ]) j8 k+ e( O; x [ set label "" ]; W! T1 f' E2 l0 d( G7 V+ K
]
( F( S. J c4 Nend, H, F0 \9 p" ~0 A
to reproduce M2 n# n4 o3 D( w& V0 L
ask turtles [! A: [1 D3 F% q5 u: j2 @
if energy > 50 [! | }8 D! N* x
set energy energy - 509 v8 @% |* k( k0 k+ D' N& m
hatch 1 [ set energy 50 ]. A& R8 H7 y) K3 l. g5 p0 e$ c
]; E! {8 E% q2 e6 F3 b* Q
]
/ p0 r% F( _8 ^7 h0 Nend
1 y; o1 A7 f0 Bto check-death% E0 u* Z' q! L
ask turtles [- x# m N8 j" u& C
if energy <= 0 [ die ]
4 }2 r8 e& s/ ^3 H/ |% ] P ]* K% r8 u+ M \1 _4 w
end* ]! }8 T" A: r0 v
to regrow-grass
8 x. k& C8 a' n! h( Y- G ask patches [
. p! u3 }8 t7 g& ~1 N; s0 r k# l1 S if random 100 < 3 [ set pcolor green ]
* J/ U& O0 p" Z: O2 q& P0 R ]
. o* j; k" ?5 A. Iend q) C2 W. \5 ]0 W# v9 h: y- y, [# w
to do-plots" }, ^" x1 k- F) ]$ {2 r. a% @
set-current-plot "Totals"1 E: Y& K0 v5 q/ H* u8 B
set-current-plot-pen "turtles"3 T! |) x/ n3 {7 q
plot count turtles
) q' m* X6 @3 _( z; U set-current-plot-pen "grass"
. m0 t. }; f+ U; H0 B, \* ` x plot count patches with [pcolor = green]- p4 a V5 \: u
end
& v# ~: o {& M可是运行时提示no such plot: "Totals"
' K% @& G* |* ~/ S$ O+ jerror while observer running SET-CURRENT-PLOT
; Q& f9 B/ |: V+ G( { called by procedure DO-PLOTS, K& V ~9 K f; Y
called by procedure SETUP
8 o$ x9 v' @& K called by 按钮 'setup'2 s. D+ T8 B. U( s% k
求大神解答啊 |