我编的程序如下turtles-own [energy] q- q+ \* ]0 r- ~! F
to setup
! {) w1 \8 N4 s# i9 W3 m3 r clear-all' K2 ]% q7 y$ u: u
setup-patches6 P' i* R$ K i4 N5 Q5 W! A
create-turtles 100
- v+ n( H- q3 w8 F1 H do-plots$ h+ J# w: P* c0 E; |
ask turtles [ setxy random-xcor random-ycor ]
$ u: F$ l& n" t! R! ]1 dend
; D8 [+ K+ A+ Z/ u* b7 `# Gto go
; Q `, ]% e; I# b move-turtles
* o# A5 K9 j8 X( h: c) ? d eat-grass2 i, d% ?: ]/ w: X: _# z
reproduce
- E' W+ x4 x4 e0 h D check-death
- {7 [, x ~9 }5 D regrow-grass
" p A. V& i4 s$ T8 G% ?% a$ Z do-plots
* w5 K; z% ^+ e: a4 W3 D3 E: [! _5 jend7 l4 h& l# d: k8 H: @/ h+ `; h
to move-turtles
( A# y" c n! w% A/ q0 J0 m ask turtles [
& J5 A8 h" h" P# x7 n1 Q right random 360) x: @2 ^5 J( T
forward 14 W/ Y- F! }" h) U# t
set energy energy - 17 `. y5 _+ s+ |- b! P g
]6 s* l5 c* x: w
end
9 E0 d0 H8 n0 k7 ^) R" D; Yto setup-patches
: L. n$ `: a0 e. Y ask patches [ set pcolor green ]
1 K- Z8 Z8 }3 J. Cend
& e- x/ S, G# K" W" F$ rto setup-turtles6 |6 v1 ^6 S' _* M3 U0 j5 R
create-turtles 100 A" L8 D: f6 r/ S
ask turtles [ setxy random-xcor random-ycor ]( p1 z& e, \$ d0 `1 L
end6 C5 e1 |& O. s, [+ C
to eat-grass
" a/ a5 H R6 E+ S% i4 `+ _2 E ask turtles [
, |3 c- A3 y0 s1 f( v9 F7 \ if pcolor = green [
/ a4 q/ W4 |# ^* X5 {3 J+ t2 z set pcolor black2 m4 x' q- S' C' u; r
set energy (energy + 10)5 b! `6 ?$ h9 M! ]! z
]6 S$ E1 N& A! z- B2 g: t5 ^
ifelse show-energy?
$ Z/ x1 p6 k+ F$ h& P F: F [ set label energy ]1 C. e! y% b7 V6 L" H, d7 ?' n: N
[ set label "" ]' [5 s: j5 x, z; T* a8 U
]
9 \" V2 V/ D0 a; }/ O# xend
' w- m# L, [5 B1 g; Y( z* \to reproduce$ l5 X6 O0 Z6 E& H; W* U
ask turtles [
: u; L0 X1 ?- h# W+ z1 h if energy > 50 [/ K5 R4 R; w' |; K2 G4 M
set energy energy - 500 \: Q9 t. x/ G4 ^+ S
hatch 1 [ set energy 50 ]
6 Q; I* ? l4 n/ q. @6 W ]. z2 L7 H9 v* k: O
]+ w: [7 d4 r- p% D
end0 |+ _3 l2 H, } A# h, t
to check-death0 e7 n2 h) n: W
ask turtles [$ u' y9 S( M* F* @8 k+ X5 b
if energy <= 0 [ die ]. E$ |1 J* Z. c- J3 b9 ]7 w+ S8 U
]& }) l# k$ n8 M
end
z1 r' S0 [6 Bto regrow-grass
/ V( F- T2 X5 U& y, ^ ask patches [3 I* K) @$ l) `' H" i- k
if random 100 < 3 [ set pcolor green ]5 w. O2 i1 ]7 z, i
]0 r, k) r L3 |
end
) X5 k% }" U0 s5 e+ Nto do-plots* F# y9 a8 x( n9 G/ N- L7 }
set-current-plot "Totals"
5 x: O6 }1 _; R' Y% F set-current-plot-pen "turtles"
6 t' n& q9 R A3 z @ plot count turtles' p9 L. o, p7 I! ?' n! G
set-current-plot-pen "grass"
+ X- Q7 J3 p+ @! P plot count patches with [pcolor = green]# f) F3 R# V+ C. l, c
end& ?$ {1 ~( H$ G$ l
可是运行时提示no such plot: "Totals"
4 z' i. ~3 q' Y. Eerror while observer running SET-CURRENT-PLOT$ a- w6 `' b8 {+ l& R
called by procedure DO-PLOTS
& M+ L/ ~" E, G4 o called by procedure SETUP: R* p0 ~0 E- F9 k
called by 按钮 'setup': G% M! j6 P- u: R. r
求大神解答啊 |