我编的程序如下turtles-own [energy]# f" {; W* L) j' g, Z' ?9 r0 v$ E
to setup
4 j8 m" e3 ^# n$ ?0 F W, R4 ]1 d clear-all
% Z) P. {4 {( g& L6 ^ setup-patches
( p0 i) e8 \) d/ G$ k create-turtles 100* h8 Z8 P) u8 e9 v" B
do-plots
! |! b9 u- X9 _ ask turtles [ setxy random-xcor random-ycor ]1 N# k. ]3 J8 c# g. g& i& t
end
3 h9 J3 x4 p Gto go
) S( R, x# ~) E9 ~$ v" P1 M move-turtles
3 `3 U: }* a1 z, Q eat-grass2 X: O+ F4 q8 T( k5 ]
reproduce+ h3 T+ F+ Y U2 n! ^* J
check-death+ a4 Y7 Y/ r6 ^) h; W% K
regrow-grass
7 I2 \" b& N; ^ do-plots
G. T* g K" s8 Iend' I% H% }; {8 e1 r! h" N8 b
to move-turtles* O0 N7 K. `9 C
ask turtles [# P6 c0 P' E0 A" n z
right random 360
' C7 n, ]( l/ Q0 c forward 14 O2 V5 d% }6 J: a: X
set energy energy - 10 W! M. Y. W. K* X5 n3 @4 d
]5 [, H( C* ]" H' G9 l/ g. k
end
7 O1 L* K) ~$ Lto setup-patches
" c0 ?% h3 H, G: X* p ask patches [ set pcolor green ]7 `% c/ }1 C9 l; ?4 X, c
end
5 m8 v# E4 s' xto setup-turtles4 _. A3 a Z" J: v6 o( ?' Q
create-turtles 100: l% e J& a' f
ask turtles [ setxy random-xcor random-ycor ]: N2 v! h/ K. K, }1 }( O" O3 X9 x
end2 m0 d; B" }* g, y F9 h
to eat-grass
6 U% s9 W7 A" O [& s7 b9 a ask turtles [
Q& U- }: B4 B' S/ {- e r if pcolor = green [$ d4 u1 t% w$ G, _
set pcolor black7 \4 B( L3 T5 o9 m; ]% R
set energy (energy + 10)5 S L# Q1 e. b' q; v
]+ q0 T2 o1 h. a; ~+ T. k/ P
ifelse show-energy?
8 B7 Y9 H1 @" W! @, m [ set label energy ]" s4 G3 f$ a3 M5 i
[ set label "" ]
, _- Z# @, _ f ] [) J x% P- U" B T+ H
end4 u- [! z$ P* {1 X1 P
to reproduce
; j8 u) d1 D1 o6 C* _8 L ask turtles [
* l& V; w) o* A5 M/ J& g) C# ] if energy > 50 [3 E* B4 R. F9 I
set energy energy - 506 Y' \0 a- n+ G& q/ c. [
hatch 1 [ set energy 50 ]+ t1 a. R6 V% H/ d
]
* h/ `: Y& G8 k ]2 C7 s# [4 E) R/ X8 G. N8 X1 H$ T
end, U7 ^; T+ A% R. h
to check-death' e8 h9 M% M+ a6 Z
ask turtles [1 e# ~* @3 y6 c/ S; X3 K
if energy <= 0 [ die ]. Y" g! M/ K9 F& S! {: p1 Q
]3 f. g( r" d* f& [) x" z& ~
end9 S6 {+ T4 \1 u$ {$ G% Z
to regrow-grass
$ h/ p' ?2 H0 Q: v4 a ask patches [, r% [+ r4 N/ c1 {, B z7 X1 _
if random 100 < 3 [ set pcolor green ], {+ v7 |( c, u1 W) N
]
: G4 s" U Q8 E' t1 d% q: L" ]9 bend9 Z' a$ |! U) R/ Y$ K, v% ^2 h
to do-plots" T* F" S. O4 c l0 K1 ~6 i
set-current-plot "Totals"$ y4 P$ L$ g8 \" q+ q
set-current-plot-pen "turtles"
0 E c( G5 O7 b8 F/ s plot count turtles
2 d4 C, D3 ~: p0 Z set-current-plot-pen "grass"
5 f7 l; J/ t" _9 { plot count patches with [pcolor = green]
& F+ `1 R! @ p" g7 xend( ^+ X& L( i4 C# j2 M" z+ L
可是运行时提示no such plot: "Totals"4 n; l3 ~4 W' |
error while observer running SET-CURRENT-PLOT
7 Z$ X( {2 O3 G0 L8 D3 p) F called by procedure DO-PLOTS" p1 `+ ], t: j* {" i4 h0 T6 c
called by procedure SETUP
& v0 w0 n9 a/ Q called by 按钮 'setup'
) l" m J3 O: C1 Y6 F% v/ e k求大神解答啊 |