我编的程序如下turtles-own [energy]
' c# f1 ?7 E, p- ` _! f0 lto setup. ^+ m- z% G# J6 C
clear-all
& @3 ~7 s0 a8 n& S1 q3 F$ C" ? setup-patches( j4 I; W) v6 V. F; l" X* l5 ?
create-turtles 100( h6 E M8 A: F$ a2 Z
do-plots
' p5 T1 m* ^2 r ask turtles [ setxy random-xcor random-ycor ]; t# U' B6 T4 o6 }! {% d
end
$ e6 {" a( I7 M6 L& ~* ]& eto go
/ X3 H- u) G: v% K move-turtles" q. G& s; f, U' r" s% T$ r2 F, P8 ?5 K% p
eat-grass
9 L8 w, a! {( D reproduce
3 M- v( x, r1 \0 }7 K# s check-death
- p$ R& g2 S( N p: Z regrow-grass
' Q0 z. g* h+ T$ |2 Z7 O$ u' M do-plots* L. M& u) h6 Y( y& a
end! f9 K: R6 }+ o& H2 X
to move-turtles8 l. R+ O0 T2 V: w/ c. Q( O
ask turtles [: h' P( X& Z6 A5 G; r( B* a# c
right random 360+ c- e5 X+ |" m0 _2 L
forward 1
# b: q B e" j1 h* B set energy energy - 1) D; o; ?* U- D+ M) C5 f
]
- _, r% B2 E+ _1 h) W" Wend: C! U8 H# z. F( ^9 ]1 V& r) S
to setup-patches5 d7 F, m5 K/ Y6 h$ m; K9 R4 s; L
ask patches [ set pcolor green ]
" s) x, m. F: g8 r7 aend
, o& n2 d M$ X4 j. |& K; dto setup-turtles
2 D* k3 X6 a9 P0 e create-turtles 100
! C% x3 h/ }" `) [6 T6 S: E ask turtles [ setxy random-xcor random-ycor ]) Q3 M) _- u, C1 k
end
2 B( x L: A* y, |- x" Lto eat-grass* Y2 V* s3 H9 ^5 h7 \+ p
ask turtles [8 J0 D2 q3 `% t8 w+ b+ A& Y" D7 K$ B
if pcolor = green [. F; X4 p, v/ x) o) s7 Z
set pcolor black4 ?' R' I9 ?7 O* \
set energy (energy + 10). R' {& L* ^; T
]: \9 d8 k9 \* B6 d0 ~0 c
ifelse show-energy?2 @. I% `3 Q% N. _
[ set label energy ]
5 P$ \# q2 i- D0 A, G/ U% D [ set label "" ]2 N" E/ t( a, F: H2 m; z
]
! [( s' h6 s& ~; w0 c' aend
* Q# ]5 ]5 X) k1 H1 n- X0 {, Y( hto reproduce
5 q% x5 R3 J8 B, H8 i$ f8 U% C ask turtles [
# d/ ?1 E* m% [- S1 r if energy > 50 [
# P4 r0 Q, U9 F/ j) L6 X" N% }+ E set energy energy - 50
- j7 o/ [. t# c/ X hatch 1 [ set energy 50 ]
4 l: J6 g% H+ `. n ]
3 n0 Y; U: r5 j/ L7 X ]
( x$ [( R' W7 o; W6 ?% o6 o) @end0 J0 f: V( L4 L
to check-death
6 [/ I1 W5 ^4 @' C6 a4 J& Y; C ask turtles [
' _$ ]9 B# I( \& B if energy <= 0 [ die ]4 ^* p Z( X* }4 ]( @
]
) O/ b' o. O, c$ {- v3 send+ V& A2 O' @3 Q& B
to regrow-grass
3 s( x* |- T7 s! M' q1 ` Y ask patches [
6 U5 A! F) l1 g# f8 ]0 a8 R7 l if random 100 < 3 [ set pcolor green ]
2 O- v0 a1 \! e+ H) D5 p) o ]
% S3 x9 q+ Y3 tend2 ]: `, @& F0 y# O8 d: K' h, \/ U% z
to do-plots
3 A* c* n; b( X1 T- r1 x4 s set-current-plot "Totals"- c+ K3 q! R- A( v8 S+ h
set-current-plot-pen "turtles"
6 c6 B: L% e: R& W plot count turtles" d G, c" l1 ?, R% Z9 r& _
set-current-plot-pen "grass"% [9 K8 n- p3 z6 s7 H: j+ g3 D( D$ b
plot count patches with [pcolor = green]
A3 [/ s) v6 O/ c; Vend, b2 X2 O& |: D, K+ g2 \% W
可是运行时提示no such plot: "Totals"1 \5 L4 B2 ^2 r# r# T C. Q
error while observer running SET-CURRENT-PLOT% R7 S2 e: v) l- O O
called by procedure DO-PLOTS' s: k6 l( A1 m4 U) B, X: i3 P
called by procedure SETUP, T; [: A/ T: t! P( ~5 W7 D
called by 按钮 'setup'
; L) d, u2 ]* o G求大神解答啊 |