我编的程序如下turtles-own [energy]( ]" i9 K( O8 o6 S# n
to setup% t# z8 G4 \! {" z5 g$ ? Y( }3 F
clear-all! y3 Q! E4 u$ y$ m3 q! r& {
setup-patches
" f4 J7 {$ m9 g6 S+ H. U% _ create-turtles 100
% Y9 d- ^9 `# N% ]6 g8 d6 E) h! _ do-plots# r# L# t4 g/ R
ask turtles [ setxy random-xcor random-ycor ], ?. ~/ i" O3 {" ]6 ~8 m3 m" R
end6 d& X: [( B8 n: v
to go6 z( t" _( a+ x+ Q
move-turtles2 U. O! |+ D d' Q' a' v2 Z
eat-grass( o f$ d; K1 G% F g ?7 K
reproduce9 C( d6 \& o: Y9 X8 @
check-death7 C! F/ S% ?" J
regrow-grass
7 S# V8 n f. h do-plots
9 T% k9 u. g0 `( o' T+ ~/ w, nend9 s% z. k5 h" A) m/ ^
to move-turtles
2 q- C+ F2 U! W' t: d, a ask turtles [
. R) u/ h2 q, t" g$ w. Q& n right random 360
% v9 H) } S% M& I forward 17 z v2 q d2 ^# U2 U
set energy energy - 1
$ K) }3 G$ X* z- F ]
} ^# u. {0 i+ Jend
+ n; x4 K# C Uto setup-patches& `/ z0 S" Z( u+ f* k( s
ask patches [ set pcolor green ]
2 f+ m3 P4 n( o4 [end; F2 v! z" Q, K: P% @
to setup-turtles) g5 `' x8 t+ N1 F; z
create-turtles 100/ A% }1 d6 g6 o6 ]5 |
ask turtles [ setxy random-xcor random-ycor ]" a$ g4 N" F& l8 J# P" `
end( q; W! [* u9 a9 u4 Q E4 J
to eat-grass
s7 y$ G) Z5 N; F ask turtles [# C: P l d# C. @; h
if pcolor = green [ ~# ]7 w4 L k9 ~- s# w3 ~
set pcolor black% k# A/ j. P, D+ i6 y( P* B
set energy (energy + 10)
0 p8 w) v1 G8 T2 {! ^ ]
, E% Y0 m. g% f! [ ifelse show-energy?
) y) J0 t& h+ ]2 h" t0 C1 T [ set label energy ]
+ r: A! i# A. n R! q [ set label "" ]( ]! w3 r1 k1 X$ \
]
5 U* {3 ]& j4 J* Gend# {0 ]+ _/ _) c& J- W' {4 w$ C8 M
to reproduce
" B1 u1 t4 n- V) g3 b0 n. ~, Y ask turtles [
8 s; Z, c9 A1 t, z! p if energy > 50 [8 {0 D3 P* S# Q; q1 ~
set energy energy - 50
* [& J& @: E" K) c0 U7 u hatch 1 [ set energy 50 ]# t" i" E; ]) X! b# ^: B
]/ N/ X% X* W3 S
]9 m/ `! b9 D0 G2 T4 \7 U
end" ?" S4 i3 v0 C6 y* ` v/ J: @
to check-death& R3 h4 k2 z7 D ?/ U
ask turtles [1 {- f( A" I1 q7 {
if energy <= 0 [ die ]
4 D- a7 ~7 I/ S2 O ]. j/ d8 U4 F# ^* M1 H
end
: |3 Q7 S; ^0 Gto regrow-grass; t3 @& r6 o3 e8 @/ w, Z' l6 h: d
ask patches [
" ~& f9 B$ p' v* f" T& ] if random 100 < 3 [ set pcolor green ]
! ]6 `0 b1 \, D5 W$ }& E3 Q. ] ]
' H' E3 A5 L) U7 L! ^end9 o/ S- W& ]9 w Z
to do-plots0 T, _2 z! I) W6 e
set-current-plot "Totals" C5 p9 h! h* u/ _- E. r3 V4 t
set-current-plot-pen "turtles"
; a) s: r6 A' P: \ plot count turtles
$ z- g) B+ ?1 P' f6 o set-current-plot-pen "grass"( G6 R' D5 J: ` ?( `, V
plot count patches with [pcolor = green]
! \+ U U W# H1 l) H& k$ w" h: Cend1 ?9 I/ K! N o- p6 \
可是运行时提示no such plot: "Totals"+ {7 a' r) y$ a. U
error while observer running SET-CURRENT-PLOT& l9 ^ N/ v" [* L$ L; t }0 i
called by procedure DO-PLOTS
0 ~+ G) f$ z7 R, c" `! y called by procedure SETUP
7 w) q& N% ?, B; E- @$ j' L called by 按钮 'setup'
1 i. C% a: S+ @2 }求大神解答啊 |