我编的程序如下turtles-own [energy]* D' ]6 b7 t# A1 t4 f/ V3 v
to setup) ]6 O5 b4 D$ W3 a1 g. Q
clear-all
9 d$ O9 k; f2 ^ setup-patches+ A. @- W$ L, q, Y
create-turtles 100: D+ J( b7 x5 E3 ~5 c l9 Y7 \
do-plots
, F K5 }3 S$ ^7 t% ?0 M ask turtles [ setxy random-xcor random-ycor ]
% j2 X0 o. P J! \3 Oend
: C) |; m$ y4 q- |( \% W6 Ato go# U: B" ?4 [* t
move-turtles( r) q1 e" A2 b g$ a
eat-grass2 v% g. t9 s9 \. O7 V4 r. w; H! N8 o
reproduce G. U3 Q9 ]* _+ [& J+ L
check-death
1 q9 T% A- x% V2 }4 B regrow-grass; M! k6 }% F( k" C: k, ]& d
do-plots4 \; R7 H8 t3 d, x: R
end
1 I$ j% y, k0 V3 {! t' @2 W) kto move-turtles
8 `1 F$ Y" g1 H% o0 Q ask turtles [
5 L" k. Z9 Z( n right random 3606 U& a! l% b$ m A3 E5 Z7 M
forward 1
; b. m* Q2 I- M, H- u set energy energy - 1
% R7 \5 s1 S6 g ]
& I1 r: V: `* @* h0 D3 Z$ M+ s' y) qend
0 X0 v- T, K/ A1 Dto setup-patches; {! e7 X2 \$ \7 f" N7 P" g
ask patches [ set pcolor green ]
! r1 H g9 m) @2 Z5 G- }2 R. H3 `end
) W6 h b7 g6 f. qto setup-turtles
Q0 U+ Q5 h! W! Q0 G H) K: g create-turtles 1001 @; O/ l9 O1 ?6 y: f
ask turtles [ setxy random-xcor random-ycor ]5 u+ B W0 y0 n) R
end# K- H0 i Q! v+ t( S2 [4 e
to eat-grass
; o0 ~ c+ f, ?- v( ?% B' Z ask turtles [
( ^# s) N* C5 s( o5 H1 A# A$ h, w if pcolor = green [, v0 T8 h4 o0 `8 q1 j
set pcolor black
7 K: Y: s. `$ g5 b8 o set energy (energy + 10)! J1 O& {1 A- k% D% l
]
, |2 M3 t$ F6 V6 x7 s% V8 d ifelse show-energy?" Y3 E; \8 Y+ u0 U, v. P2 b6 Y0 Q$ x
[ set label energy ]
$ j: u1 P0 Y( R* C# W [ set label "" ]8 \/ X. v0 r- B! o3 L
]" T+ q/ r, J9 _8 j/ ^6 p
end
) q U( Z( o |2 Nto reproduce
* V; _0 U& F: A3 V- D9 \ ask turtles [! {! f) ]$ W6 Z
if energy > 50 [7 B/ N. L+ z! o( d5 X
set energy energy - 505 }5 O: z4 T e- ~' Y' ?( ^ h
hatch 1 [ set energy 50 ]
/ ~+ R& v) f# O) T( { ]/ q7 C9 H3 N2 p5 p; ?5 O+ N( R
]
, X' E3 Z& [) V4 q. X ~( Qend
0 j; k" F g Z+ c uto check-death$ U; p3 q' r, J$ ~& X+ E
ask turtles [
8 G. m5 B7 k- \( b if energy <= 0 [ die ]
0 t) i2 m* _8 \" H ]
% ^2 E* b6 l+ `! _, o9 C" Q( u6 yend$ |: W2 g- K; I2 ? t2 k' ~
to regrow-grass
4 e. y% _" F* G- H+ @5 }! g ask patches [3 C4 G4 t, z8 { p6 m+ ^) B6 o
if random 100 < 3 [ set pcolor green ]) G' g: P' |; g0 G
]
/ C* s7 g, q" f8 d: Hend7 \( S9 Q: S8 |
to do-plots
& P4 y! q8 J& J5 G set-current-plot "Totals"
9 [( ]6 J) c1 U: b2 P- e set-current-plot-pen "turtles"
, q8 ~; B5 ]* w, { plot count turtles+ R! f4 P/ S1 G) k5 p2 Y7 B# X
set-current-plot-pen "grass"
: e+ k; I1 z7 X8 N$ p+ U plot count patches with [pcolor = green]
2 { u/ l% W: I# w: mend: v7 z; H) u, n
可是运行时提示no such plot: "Totals"
: V0 r' Z7 N1 m7 Derror while observer running SET-CURRENT-PLOT j8 I, v4 k# [9 j
called by procedure DO-PLOTS
8 ^7 O3 |& T# Y' N' s0 _" r called by procedure SETUP. c8 B; h" I2 \0 O( F7 q
called by 按钮 'setup'* C; v8 ]% _2 G* x S6 E
求大神解答啊 |