我编的程序如下turtles-own [energy]) _$ X+ B7 Q2 u p1 U1 \
to setup
" f. t9 g. f6 s: _; h7 V. S7 s) l clear-all0 X. C1 B6 r" z7 M( x
setup-patches, }* N. \8 Y5 S2 E% k, D
create-turtles 100
7 d! k( l1 [7 G" F; w3 h3 `7 s do-plots
( _7 z% L3 T& r% M7 U$ X( Z! h5 g* y ask turtles [ setxy random-xcor random-ycor ]9 ^ t. R4 } u" i4 P7 l# T8 O
end
! z6 q- Y. D0 D+ J5 o! ato go5 ]8 S4 o0 N* {0 K
move-turtles. q) w; A9 |! R f
eat-grass
5 E$ l8 Y( M) B2 c* D reproduce
" e& N: \2 s4 @5 y check-death
+ S( E. }, ^ k1 h* K) w% ?+ {% j) u regrow-grass
. H. {+ D3 W9 w& L" o& ^ do-plots
! A3 [ [* {( F0 I9 v/ J' Y( d' c: tend
" J/ a3 m1 Y. S- T8 _$ o8 G" Q Eto move-turtles/ n; C5 s& \; e& J3 [% I
ask turtles [. \/ |; z6 e; o
right random 3607 ^! N8 k/ W5 [
forward 1
- {- L# M( C7 l/ Q) S* j/ i4 s set energy energy - 10 O6 Y9 o! G+ a7 I
]9 y' R0 k; i R3 P( h: c
end
# O* f# F7 b" @/ @% nto setup-patches
/ w* }- o& c2 h ask patches [ set pcolor green ]' r0 [; a# d% ^: E3 L$ H
end. H# t. o' l8 i0 M0 L7 |" i
to setup-turtles1 E; N: p. I: l$ K1 @1 o+ a
create-turtles 100( \( f9 |) k+ E: b1 `) @
ask turtles [ setxy random-xcor random-ycor ]4 q6 n3 Y- m, d* L8 L
end3 j3 ?# i! t, H) i4 O; p1 Y3 l) {
to eat-grass
! y2 l: B& G, }$ i: w ask turtles [
* o# {/ M; S% [, C$ v if pcolor = green [
1 c- \9 z! Y$ K& j set pcolor black
2 ^6 h/ Z5 T0 {- R1 R set energy (energy + 10)
% H! p3 ?4 a( P$ \% \4 ^ ]
) p; U- e4 N* u ifelse show-energy?+ M( {0 m+ y3 f8 H: h, K+ b' T4 ^
[ set label energy ]
. I3 Z% H. f/ v* L [ set label "" ]7 L* v: L0 \% ~
]
E3 o* q5 K0 S- n3 V' @+ r/ vend
5 G) n$ w" p) ~. G/ Z( Nto reproduce
* Q* M* Y2 g& G H3 R( ?8 I8 v( m ask turtles [ l4 V; f6 A& Z0 Z( S0 ]5 o
if energy > 50 [6 s- W B3 E" S, H
set energy energy - 50
2 ^/ \& t; [7 ?% ? hatch 1 [ set energy 50 ]) d* f& U$ [4 @: X9 i, n
]
) D& q& J3 ?6 k ]' X' |* x" V( N6 s6 N) f
end
* `% A0 J2 g" r2 y: K% | F- D* p' zto check-death- d8 Q& C9 R& k; I5 A
ask turtles [* D. B* D8 J0 w, r
if energy <= 0 [ die ]) h$ z( ^, c$ g9 ]; N7 h
]
4 x8 o3 g1 d# r; V. Z6 b; h4 V% eend
, @' |0 o5 D/ Ito regrow-grass2 u- W9 u( t" A$ d: G1 T0 q
ask patches [. A/ }' V2 R1 \$ O3 |' S
if random 100 < 3 [ set pcolor green ]
) g5 [" U' S5 t! G0 ~! a K ]" G3 K. ^0 w. g% T: [
end/ u9 S; K& c/ }8 h/ W% O
to do-plots
@ T# M* b. G" W set-current-plot "Totals"
8 x9 F. r" v5 j" [0 h* C' c4 {% l set-current-plot-pen "turtles"+ W2 e5 @/ j2 ?% F) w( o
plot count turtles
: k5 b$ R2 T& ]% a+ O/ G, v set-current-plot-pen "grass"
9 ~' `, T3 ~& ~/ {2 T6 ?6 }9 G plot count patches with [pcolor = green]$ p Z, o0 x |! p% g
end
# u" W2 ^8 k9 e) c4 c可是运行时提示no such plot: "Totals"
4 ]2 d1 c; M7 v; B4 Serror while observer running SET-CURRENT-PLOT6 f/ n" p2 d' j/ V* l
called by procedure DO-PLOTS9 y) T, l! ], O& k
called by procedure SETUP0 K6 y9 Y3 a6 N' X
called by 按钮 'setup' T, Y5 f# S; o* D- }3 F
求大神解答啊 |