我编的程序如下turtles-own [energy]
$ c9 _# t# X0 zto setup0 u5 \! V/ L& ]1 _
clear-all
& P4 }( L# P0 V& n/ r6 G setup-patches
& p3 } u* S* B" O$ { create-turtles 100
1 I! V n& F+ g/ m' X0 b6 x do-plots
4 t9 b3 [1 I# {7 \/ b ask turtles [ setxy random-xcor random-ycor ]1 V3 |' Q$ E' h! }$ |9 v) W% ~" R# R
end
; L# P8 n- P( `" `: i0 I/ mto go6 ~% M; L! l' U s; R+ @
move-turtles
: s" k* |6 _# m eat-grass
- [1 @* v% S; E- O; U. L reproduce
) A4 ^, B0 l9 C3 p6 T! K check-death
7 M7 U) E# B$ c regrow-grass
: s2 O+ \, r5 C/ b- n do-plots
+ K! Q$ ?# {& _! i7 j; X L; Hend
7 l) \- l# Q [# T- Hto move-turtles
^1 ]# }8 W4 ^ ask turtles [
5 r# B" u4 H6 l8 e right random 360, F6 D* i4 `' V& q w# i
forward 1
/ ]* ^1 ~" h$ t8 o1 k$ z set energy energy - 1; Y% C x% H6 j W- l1 ?( _4 Q
]* x! c- z& j2 s
end+ g4 F9 C/ U4 O$ I6 E% R, d3 w
to setup-patches( v9 {9 M, w! \: V% `: ]8 O7 `
ask patches [ set pcolor green ]
! L4 G$ v/ a- x" L- {4 S' ]" Gend
/ ?# b2 n# \6 b" p# R. ]+ _: s0 Z+ nto setup-turtles
5 g; L. p' _- C6 }4 V$ b create-turtles 100
' Y- o+ J& s7 y" p/ h ask turtles [ setxy random-xcor random-ycor ]
! X2 a: r* K- I/ r! eend
& q9 U9 s6 k5 r0 bto eat-grass
! F* _" X1 {! e8 }" U' m7 M ask turtles [
& p4 }$ M. n: g/ r; Z& z if pcolor = green [% _( g. f2 x# ]3 l5 ?5 [: \
set pcolor black
2 v& u0 C; {2 L& y set energy (energy + 10)/ b9 }% t* P- e# ?
]
1 {- }7 T( ]7 R5 y& | ifelse show-energy?
! D A4 j9 A4 e1 N [ set label energy ]) N6 n2 e( T x/ T: q* ~
[ set label "" ]: b& I& }* T/ \4 M& V" \7 Y' p0 E
]* H" {2 ]& x' F8 ]3 o: `
end6 | a1 C4 K* V; ~7 I+ ]
to reproduce
, [4 d, y4 s/ T2 Q$ r& B) @- A9 F ask turtles [
& q' ~! ~ V+ m if energy > 50 [* J; b! t; b0 F" w0 W W
set energy energy - 50
! E' U! O, P0 o, |6 W7 ?$ H hatch 1 [ set energy 50 ]
" @5 J! f2 i5 u e( d ]
: ~, l1 q$ C7 g( B) X" c ]
g @: g' O I [8 T& eend
2 g+ \ \5 P* s4 F; f. j8 qto check-death
8 R0 t4 L* v+ ~3 }! R5 @, R ask turtles [
& U) i+ G8 i. H# u' u: t3 m: ?4 b if energy <= 0 [ die ]
8 q0 g$ [% C. G: k ]) R& v" m( ], h' R# o! ?
end
) Z. S, ]3 J! I; P# i& c. F; \to regrow-grass
) l) m1 m; E/ q- S ask patches [: b7 B; z, i: ?7 v, ?0 c' h
if random 100 < 3 [ set pcolor green ]5 T, g# Q% _3 \1 b1 Y
], ~1 M4 j! Q8 j+ f) S
end
. x) V! M' }9 r) B7 @to do-plots
. \" w/ G' O) a" q set-current-plot "Totals"4 M! X/ o y5 l
set-current-plot-pen "turtles"1 l/ D. n( f6 d# O
plot count turtles
: _# Q/ e9 X0 }% t+ q/ v set-current-plot-pen "grass"
+ [: Q% h' C1 L. v8 E$ z6 R# E" ` plot count patches with [pcolor = green]" S- } n; ?( A t
end, g2 f# @9 n5 u% n" T# c3 w& Q. b
可是运行时提示no such plot: "Totals" A/ U1 W% }/ L$ y8 F2 V% o; w) W
error while observer running SET-CURRENT-PLOT
" h' j7 \2 S* O) S _5 A called by procedure DO-PLOTS
5 Y9 g! m0 u) I2 q( Y# Z( j, F called by procedure SETUP7 ]6 p- d7 v$ N% r
called by 按钮 'setup'2 f1 S3 o: y( O$ s; U! m
求大神解答啊 |