我编的程序如下turtles-own [energy]
$ N& t2 @# R) D N6 @% Xto setup
2 o2 S, p6 [: A clear-all
. T) u1 }) q# t setup-patches
! \' Q* o% ^5 I5 R create-turtles 1005 y/ F g9 y2 C
do-plots: L$ S$ k% l- z/ z! z4 n- n
ask turtles [ setxy random-xcor random-ycor ]3 x1 i4 g& K& \$ m
end2 @- Q3 L! t! x1 z
to go
% b" H* }8 w3 D3 v move-turtles8 s! Q5 x) f! b1 x* q
eat-grass
v7 C- B. i2 s% \! d reproduce
8 E7 u3 w0 M4 c3 D- U check-death
7 U$ X- [( G6 n! x regrow-grass
: E/ `$ Q( _* @8 V% m do-plots% j" _$ c C8 @4 [! Q
end+ p6 r1 F+ M: U! m9 l r. b. a+ p4 }% l
to move-turtles
* u0 |1 M! ^; D5 v3 q ask turtles [ m2 g& X0 l/ @8 W" p5 L9 D, t
right random 360
5 H/ ?) E2 q. l& J( |$ X+ \ forward 1
: l0 g9 M, r# d% S( N set energy energy - 1
+ q+ h9 |3 o: e/ ?- l ]) E% h3 ^4 X6 }& u* T5 n
end
& b. Z: r5 W% t2 c' D* V" Q; s/ zto setup-patches
% p6 x4 Q' }4 `* R6 Q# k1 J ask patches [ set pcolor green ]
E3 r0 N" D1 d: rend
& ?8 z7 I3 |7 jto setup-turtles
, p" ~/ f4 V- K6 r2 e/ y* K! [ create-turtles 100
( e9 ~& p. L& _9 s ask turtles [ setxy random-xcor random-ycor ]
1 x. D+ c& {- Pend
: ^. N' }8 B2 [- zto eat-grass
: q; G/ O4 p7 P+ U" [ ask turtles [- _5 [' Q' j/ q- E0 Z5 g, {
if pcolor = green [
6 i9 V& ^7 L: Y h# K8 M1 N6 { set pcolor black/ K6 G, W) l$ f, J1 s m
set energy (energy + 10)
1 J8 q8 P- t7 L C7 @9 p ]
2 T) G! l0 x: o2 F ifelse show-energy?- V$ l i$ Q8 w% ~. y; l* o
[ set label energy ]
" q4 a5 J4 k+ V/ a2 | Z [ set label "" ]
; n$ r! c: D' t ]9 R1 Q0 p8 O1 [; E$ Z# d
end
2 H7 ]# D' r4 t; s g, `0 kto reproduce/ v2 E4 T$ X$ ?4 ?! B+ }# {
ask turtles [
# C% d9 A u0 M% W7 C3 A if energy > 50 [
, w' Q* N B7 ^* o( [& b; c; A set energy energy - 50
" y( b6 x6 |9 X5 V. L* D$ w8 i. h hatch 1 [ set energy 50 ]/ `7 D% V1 c* Q% G
]+ X) m: v* e2 D$ @ \6 N$ ]
]! R% _ H2 f+ @! |! P l3 S2 ^3 D
end d4 Z. j, W0 h9 X2 A z5 P
to check-death
9 R; e, w6 ]6 r L4 M" C ask turtles [/ ?! j) Q8 v+ b' ?" i, g
if energy <= 0 [ die ]
4 T& N% B4 E; z `5 y0 j ], _, ?( E" b9 B
end, |, k$ ~4 q: Q; E: H, B' r
to regrow-grass
% w. I" j% x) F6 E# L/ s, E; F7 D ask patches [* s) I! U/ N( H. ]
if random 100 < 3 [ set pcolor green ]
3 X2 I) c) z6 @ ]
+ `2 j+ H7 C9 Q$ r6 R5 jend
" [4 v# o) X0 f5 Q6 x. Y9 O! Yto do-plots
. [* m3 K/ h' H" h4 ~& N set-current-plot "Totals"7 u9 p( O' i" L6 U% Y& W
set-current-plot-pen "turtles"
# c, j% M0 P1 N plot count turtles0 b" {2 n, q; ~- j- U1 `
set-current-plot-pen "grass") Q( v/ @/ s; T4 r J
plot count patches with [pcolor = green]
* i" p2 G, P! M0 u9 Tend
+ G; v7 D/ P. E9 }5 e可是运行时提示no such plot: "Totals"
' T& B' |* O" b( R7 yerror while observer running SET-CURRENT-PLOT
D" O/ u1 w+ p& Q) z9 y C0 V called by procedure DO-PLOTS
0 k Y) j4 N. L3 |0 \( Y/ j called by procedure SETUP$ k, K5 U' a- Y: W6 Z
called by 按钮 'setup'
: w5 K( k3 y3 _+ X- L求大神解答啊 |