我编的程序如下turtles-own [energy]: \$ O0 x# a, P$ d k/ r. m
to setup
3 U. \& X4 ^1 _# B* ? clear-all- Y. |& I' q& M, H j
setup-patches0 Z6 ^$ c2 F1 `* g+ Q. v9 L
create-turtles 100* b( `8 s1 I# B1 W! {7 H
do-plots, u/ C" k, _' E0 |; z5 Q* p
ask turtles [ setxy random-xcor random-ycor ]
* }# q9 X/ @8 e( Eend
; p5 _: t# P V' vto go8 N6 _; G! j+ Q$ \
move-turtles0 }% l: n7 }2 A- ?5 ]/ O w7 d& _$ V
eat-grass
C$ }2 n0 m j6 O# ~" `; K reproduce5 z7 J9 F) P8 n& U. j: u, S# W7 J
check-death
$ o) K/ ?$ k& x' K% d regrow-grass/ k8 n6 y m6 F5 h$ n
do-plots
# y) s3 Y q' K- e& b& q( Kend3 F4 @1 M& Q/ d
to move-turtles: b% I. W6 @( w' ]
ask turtles [
& f' I7 t. |& D, q* k. A& g0 a right random 3609 n2 _ T+ j4 Q( m' a5 E- q% ]
forward 19 H4 H* V, [5 W
set energy energy - 1
/ }3 `2 i- B! n, ^* ?0 T ]% p" K! n. Z9 c b \ Q
end3 `0 E0 f3 y+ L4 g3 c7 \
to setup-patches
1 V4 P4 S! d4 Q* s8 Y- Z ask patches [ set pcolor green ]0 A" j+ {2 t7 D& F
end
( i! A1 |. H/ p# x# i ito setup-turtles9 L) F' k0 V1 {& @9 L2 i J) i
create-turtles 100) h& ~$ H! h: Q$ q
ask turtles [ setxy random-xcor random-ycor ]
, [5 C. x6 N4 @2 r8 xend
7 U& \9 t0 Y! e: O4 H1 |3 qto eat-grass
1 ~( W3 U: ~4 t [ ask turtles [
' i. y' x9 ^/ ?$ y" C" _ if pcolor = green [9 {: I( L& j; F% ^: J% O. e
set pcolor black* v5 c0 \% p" f; I8 E" Y
set energy (energy + 10)
# O# q Z; w% S. h7 F. f/ h5 C1 V ]$ U/ I1 ] C. p
ifelse show-energy?+ P) u9 d' f I# j0 L
[ set label energy ]" L! o+ d! q# z/ P
[ set label "" ]& q( i- d& t9 |6 {, R
]7 f5 t' `' c8 W. @
end
3 t6 b6 q: h: ]# u9 Ito reproduce( w$ j+ x/ {9 E3 q& ^4 g
ask turtles [" @0 S% l6 ~3 m
if energy > 50 [
7 O' L( m! W7 { set energy energy - 50% W/ h _* R6 I4 ~9 K
hatch 1 [ set energy 50 ]
# P( h+ U! h! A) H' X ]
8 Q0 q5 p( [2 h. ~/ E$ V4 o ]- k0 l! Z9 {( c9 ?/ }
end( `/ d: A& p# v. F1 f& h* R
to check-death0 F5 F9 K' A: C# k" g
ask turtles [
, t1 e! X+ M2 R) e if energy <= 0 [ die ]
1 g d9 |/ L1 Z5 v) ] ]
6 M5 t2 k* B9 A4 O7 n/ nend
5 d; k8 ^4 @/ dto regrow-grass
) U+ g8 ]8 {) {/ R8 J ask patches [+ T8 b: C/ r! M/ U5 _; ^* ]
if random 100 < 3 [ set pcolor green ]
6 U( L/ C1 Y) c% m9 z ]
& z$ r. \# {- @/ dend
& A0 K* K8 ^2 M- ^to do-plots% F% h7 C8 ?6 g& m! f! B
set-current-plot "Totals"5 c, R- A+ r* @6 g3 J
set-current-plot-pen "turtles"8 S: U9 e% B% D5 P v3 @7 C- w
plot count turtles3 T: V; C# d' h1 H: w. E
set-current-plot-pen "grass"
0 _; W/ U- t4 k plot count patches with [pcolor = green]
. B( \3 f7 v/ c Kend C! }( n8 ~/ o! j
可是运行时提示no such plot: "Totals"' B' o0 C7 A! \- v/ H" H* N
error while observer running SET-CURRENT-PLOT
; I( ]% g8 _, M' C called by procedure DO-PLOTS
# B. p [5 h0 ]$ p. {' K called by procedure SETUP; v" N" a# [5 h* {% s! L: W( N
called by 按钮 'setup'6 T1 b& J+ o7 }( p0 s5 L
求大神解答啊 |