我编的程序如下turtles-own [energy]% |+ i. @" M, r9 d2 r. l& }
to setup
5 a0 H( r4 i E+ L- T. v clear-all
9 a3 G. J0 S, P6 o, Z1 x setup-patches
* L% ^$ y: W* O6 r D, \ create-turtles 100
* w/ X& \9 u! J+ U8 W, m0 S do-plots# l3 E8 A3 \ V
ask turtles [ setxy random-xcor random-ycor ]
+ B% z; Z8 Q9 x0 M. o6 A8 _end
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move-turtles
. m* ?0 B1 S0 J* e7 e: a eat-grass
2 L# x- g0 Z$ k" T, B: t reproduce
) \+ j6 O; C! Z0 t1 ~- o check-death( Z2 j. N! E" N. T# I6 G* ~% Q
regrow-grass$ ?8 v6 `* g) D. U
do-plots
4 Q4 e# y; Q0 Z' o. i* Oend% O) t2 ^3 k0 U' ^# a5 H
to move-turtles0 X- ~" w O) N- A+ \: y% I
ask turtles [% I v7 Q6 Y$ P
right random 360
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set energy energy - 16 Z/ Q( k+ E, ]
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end1 z- ?, P! _& S: Z) Y
to setup-patches
( u. v$ V) y0 Q$ k( y ask patches [ set pcolor green ]
5 ?- A1 b" d* F( a* W1 Z6 Tend: h# w" \( S8 l, e
to setup-turtles9 Z$ E H0 T( j% x
create-turtles 100( A+ N/ ~4 [1 I( v
ask turtles [ setxy random-xcor random-ycor ]
' G9 `, s. U1 J; ?" @end/ j- S9 z4 E3 T8 ]5 l
to eat-grass
- @! J7 B& ^# v2 Z) l# ~ ask turtles [
& z% k7 q( i' z1 ` if pcolor = green [
1 Z( a+ R+ P3 S5 W# v; W set pcolor black- D- U' m% x' w$ j+ k2 N
set energy (energy + 10)
* S6 Q. r& @$ N ]+ v' l* j$ {& O8 u' z; \/ d0 J
ifelse show-energy?
2 f) A: v3 M+ p; | [ set label energy ]- F! n: r6 M+ i& D, c/ h
[ set label "" ]; v: v& I# C2 `1 d0 v
]
8 [, a7 R+ c, E/ a; Kend
/ e2 M" p* o lto reproduce
. w* W D4 H9 f) v3 _ ask turtles [
9 E9 J3 w" n4 U; ]5 l+ E if energy > 50 [
* d* c g" \/ \ set energy energy - 50
% L: V0 \+ |. e( Y6 Z5 ?1 S hatch 1 [ set energy 50 ]
/ M e3 j+ P9 Z ]
2 B) B D( U, Q7 f! I6 N/ z7 M% e ]8 v m( C8 B3 R3 A: X
end" y1 Q3 t8 M1 H* m- _
to check-death2 [ m& V( Q( `+ P
ask turtles [- q2 M' q% i h2 p9 e, q+ t+ A' f
if energy <= 0 [ die ]
$ {; x+ S. h( _* }' Z ]
1 }5 f% i9 G7 H9 ~& n- Y6 oend, p1 l' o( J, h X
to regrow-grass% m% A- ~. x6 i+ d# s( s. D
ask patches [
3 l) N, j+ n6 S+ k, ~( H9 J# v+ C+ H if random 100 < 3 [ set pcolor green ]
% K% Y: ]5 ?5 o X0 G8 y4 y; b" z ]5 N5 `8 S2 A! U6 f1 g
end
4 r# c% j4 {: B# Mto do-plots
/ Q8 b3 A. i& w1 B8 h set-current-plot "Totals"
& d4 e" M4 M8 Q7 @$ i, t0 |# s set-current-plot-pen "turtles"
3 T( S& k1 }$ K+ v( O plot count turtles
: S* [1 R0 Y6 E set-current-plot-pen "grass"$ U8 m" |; w) a0 ?, D1 z
plot count patches with [pcolor = green]6 s. Q S; s% v# D, c* s
end, Q/ j; m: `: O
可是运行时提示no such plot: "Totals"
1 @- U7 x' h# w; Lerror while observer running SET-CURRENT-PLOT F: `" m! y* e* {
called by procedure DO-PLOTS
( q2 g4 @9 G8 V3 Y- [2 _ called by procedure SETUP4 l& i1 i* i l
called by 按钮 'setup'
- e) h* m" h2 U/ ^: ^/ P( m$ T求大神解答啊 |