我编的程序如下turtles-own [energy]! ~( J d5 J0 K6 g+ z* X2 f
to setup5 j, O G$ I% R
clear-all/ L g) w* O. i! S2 n$ `) i! i
setup-patches
3 I/ S: ^( F6 Q* P: v7 y9 t create-turtles 100
2 m% y) u; M& _9 a, j) C9 p do-plots& a. k% K& S0 v, B a/ ?+ W
ask turtles [ setxy random-xcor random-ycor ]
5 `8 i5 @/ t1 m* send
: W$ Y1 e& `. h5 g& {' g, i. Yto go
) X5 ~! x- C1 L1 A& m# o5 D( B move-turtles1 ?, u9 X+ W& R8 l
eat-grass0 a/ i8 Y3 k6 s1 a) o9 }; u. v
reproduce* k& f5 r( p( H! _+ B: r; g( [( }4 Y5 K
check-death9 ]" {! p8 g. o0 J3 U
regrow-grass
! I$ v7 x) C& w7 ^ do-plots% U, X8 r% J [( }
end- r" C; `* |& a( H* n: g
to move-turtles
9 K( u% p2 Z* K% e# a2 g, x v3 C ask turtles [2 L8 @0 L3 [ z) f! h* W, t( z2 W
right random 360
Y3 p5 ?8 Z5 L! s forward 1
. \' C. F6 L- m6 L9 O5 _2 u! k+ s set energy energy - 1, I6 M a8 g E( _4 o
]0 m$ ?) M' l# d/ ]. p5 [% n
end
2 r% f' {" m7 T# ]7 w4 Y3 P2 Pto setup-patches
: Y# m0 P3 W3 E; J3 j ask patches [ set pcolor green ]
8 x% n: h; x' qend
$ e- T6 t9 E! _- _! T) Bto setup-turtles
: h9 b: `4 g% _" Z create-turtles 100
, @1 S! D% @. ?0 K9 B ask turtles [ setxy random-xcor random-ycor ]5 v4 d, z: `6 B1 Z' z+ Y
end
$ k0 R5 E3 ?1 S/ hto eat-grass5 h- n' ]/ ?0 F% P2 T8 s9 M
ask turtles [
$ [1 {6 K( s% z1 w! w if pcolor = green [! S1 e) @# v# H! z+ s
set pcolor black" G* o2 u, v6 `0 z( p
set energy (energy + 10)4 l; z- W9 ~+ d2 ?6 k2 @* p
]/ `; H0 @; ^, |4 T) N4 e
ifelse show-energy?6 g4 j. d: R5 U$ {- y- T. V
[ set label energy ] H% a0 [$ L) y% y- s. i/ i
[ set label "" ]
: P9 ]. }. {, W, V: G ]/ T- u) Y. r6 S0 i5 b! [4 ]9 j
end
" g" o, G: c, w* ~0 `! q. m0 Cto reproduce
, b6 B4 K- Z1 M6 i% S6 a ask turtles [/ g4 R6 E7 C- u+ Z* K5 N# {
if energy > 50 [
! X f e. h5 r* ^5 o0 B set energy energy - 50
?8 }# r7 Z. }# [" ^ hatch 1 [ set energy 50 ]
2 f9 \1 q: C& l ]
/ ^2 A! r6 Z' k% C) V* ^. F" k ]
3 V7 q. o: @% G5 {end
! N+ b& s+ u; {( a% K: \to check-death
$ ^6 l" A9 Y2 y0 Q# C1 G: } ask turtles [
; P, C& n. }$ s J if energy <= 0 [ die ]
0 B0 E' c: b% \+ y0 A' b' j# o% r ]6 r y/ \2 z, M/ _ o
end3 m9 j y% w- }2 V
to regrow-grass
a& b0 l& p: S: H+ [* ^& |, z ask patches [9 }$ D2 Y0 d) S* b l4 `4 C- F
if random 100 < 3 [ set pcolor green ]5 h+ U4 L6 U$ [6 W4 Q6 J( b! o+ S
]
. }) ?( k, P9 A" ~9 Fend
; M' w1 c. i% |1 gto do-plots& r/ m5 N' m1 }+ t% d
set-current-plot "Totals"
3 }% j" _( {+ x set-current-plot-pen "turtles"
7 M, l* x( G. B( h9 j) C9 t3 h plot count turtles2 \8 H; G- T2 w, S
set-current-plot-pen "grass"( y) p3 s5 W8 E J% g
plot count patches with [pcolor = green]* i, `$ U7 m4 ], p0 E( p8 W
end
4 O) I+ |$ U+ `, O4 T7 [% A) K可是运行时提示no such plot: "Totals"3 s' f, `. L9 b8 m
error while observer running SET-CURRENT-PLOT: D/ m8 }4 L0 [% T2 [6 v9 W2 S* a
called by procedure DO-PLOTS
+ d. i. C! R. g! }2 t( u6 N k called by procedure SETUP/ I3 ?$ J+ K! k7 m7 m
called by 按钮 'setup'
- @9 h$ h/ m( {3 T$ m5 G* h7 X: _求大神解答啊 |