我编的程序如下turtles-own [energy]( p- [; e: D. R. D5 j. U$ g9 q( w, Y
to setup( L2 V' q3 F. s/ [0 G3 Y; S N
clear-all( j. L; W0 b/ u) e
setup-patches% t3 Y- E" \ l) i
create-turtles 100 t c9 M7 U8 C, f/ ]' g6 k
do-plots
" U2 u! F2 L0 }0 I# q ask turtles [ setxy random-xcor random-ycor ]
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to go# N6 e N5 A3 K. z
move-turtles
' j7 Z4 t" [- t. I eat-grass
2 I. [/ S- X) Y/ t% X" k9 [9 f6 e. | reproduce3 _; E! b2 Q7 J# _* W
check-death
H! \" A9 Q b+ W3 `( ?' @4 V regrow-grass" r% |8 ]* J5 I5 e
do-plots o! T) j: m; T% R: I/ Z3 h
end
/ }8 S9 a. u: g \0 C# @to move-turtles6 o( z9 Q/ J7 i# f) P+ c5 E# M6 H7 f
ask turtles [
1 v: O- \7 q& ?% T: [( l right random 360
- r0 L8 w; k: j- A! @ forward 1# _; }4 T& d0 [9 I8 A) K
set energy energy - 1
3 p9 P9 c2 M! d/ X4 _& c0 | ]8 K- e: A% ]: h. R
end! @0 i2 u* P) Q1 M0 s/ t7 E
to setup-patches
9 ]) J. h z, g8 m ask patches [ set pcolor green ]! p& W$ W: _3 w8 {# C$ L/ z% P
end
w+ S; C2 p. L+ M& Wto setup-turtles
0 y* S" d7 o' R& j) }2 u create-turtles 1004 \, I3 Y6 S$ E2 b
ask turtles [ setxy random-xcor random-ycor ]* Q6 _5 K5 M2 [1 y" V8 f4 z% S
end2 \% Z# m8 C/ m. }
to eat-grass
# x- }& W O6 z, [' @. P ask turtles [
0 p1 [" Z. L, X: _' X- n4 M6 x, n if pcolor = green [8 F) n) z2 [ _, X
set pcolor black8 x, X2 U1 q) j! ~$ K
set energy (energy + 10)3 A) V9 p& }. A+ f0 c, T* {. `
]
- t: i* [4 @/ N ifelse show-energy?6 E( Q3 d" B$ x6 K( ` T
[ set label energy ]
9 I* J9 _7 x" j. E) e) q/ Z [ set label "" ]
n& l$ L$ L" C1 ]$ [/ f& } ]) Z$ }, s1 U3 f; ~. b% r( }
end
1 Y- z9 }( O+ P7 d0 \0 B) ~( @4 T7 oto reproduce
6 ^1 k8 H" G0 f8 ?. |- v ask turtles [
+ j- a4 _' n$ x7 n8 }3 f0 H1 d! C if energy > 50 [ f5 l d, k* Q% {
set energy energy - 50
$ L) Z+ b5 r. I6 o# {! P hatch 1 [ set energy 50 ]
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]( x5 C! { j- X1 m
end
) O9 T3 ]$ _2 Ito check-death
9 b K( e! P5 ` F3 K( E ask turtles [
) M9 w7 F2 S- t6 w+ p6 I4 _ if energy <= 0 [ die ]5 l5 {/ J. ^7 R5 f+ ]& |7 p; r
]( x) s2 z! p j: L) }7 q
end
' I- k- Y! ]3 Fto regrow-grass
/ C l, R) y! A% O ask patches [ }# x/ K8 R/ b# I0 J8 U( F8 S4 z
if random 100 < 3 [ set pcolor green ]% o5 M# m& f/ J6 t8 ^3 Y$ d0 H) E
]
( ?) a0 @2 u- }6 Q) @9 S. l* T0 Yend- j7 p% x* t7 a" I7 c9 a0 i0 e o
to do-plots
" k6 |. e, w$ P7 F set-current-plot "Totals"
" ~& f6 d8 u+ Z1 p1 n6 D set-current-plot-pen "turtles") A0 ~6 Y# p! f1 i
plot count turtles
r# P( d& F9 u set-current-plot-pen "grass"5 r( L4 A7 e5 V
plot count patches with [pcolor = green]+ R2 Y6 d1 Y6 O7 }3 s
end1 a' V( ]; |: _& X8 |5 b
可是运行时提示no such plot: "Totals"% ?- x- w, o. a! m$ Y/ Y7 s7 i+ d
error while observer running SET-CURRENT-PLOT( g8 F# B/ i+ P- h
called by procedure DO-PLOTS$ \( Q$ e; h1 @2 @- G/ R# i
called by procedure SETUP8 Q# Q$ F! Y" A$ G* u
called by 按钮 'setup'1 F( n1 U' J& h
求大神解答啊 |