我编的程序如下turtles-own [energy]
2 U. y2 m* D! B" l& U$ @4 Z1 _to setup
& R. m; ?% H, S6 d( ]' S- S clear-all
, K' I% T2 V3 z- z setup-patches8 z+ @ F8 ~6 P5 l9 G, l
create-turtles 100( [( p/ \. r+ ` n/ x! n- m
do-plots
7 u5 i& d- m* H" B, [9 y ask turtles [ setxy random-xcor random-ycor ], ?: {) F ]- f. R0 S5 i; b
end" d T7 k+ D1 n
to go( V* F2 p% t/ B! N/ i
move-turtles
7 `1 ?7 X# ?8 C eat-grass" \# Q# x6 ~- a7 f& ^$ a' c
reproduce
/ ]8 ^7 d& k7 F check-death3 i, _/ [1 {4 O; s
regrow-grass) y! J1 A3 b! F# M, X9 C
do-plots$ [+ f# `5 Z: Y1 K5 ^3 `
end
4 J# w+ Y! _! O$ V; v# S* i2 N0 [& kto move-turtles
7 V* m+ A$ o3 u9 y t: M ask turtles [
+ {( E0 C7 a- Q& ]. p3 v- ~! h right random 3605 |) |& s& v! f! x* l
forward 1
% ~) G+ ~- y7 V" n! T% }( r" h j set energy energy - 1
0 h. B5 l6 X( `) J1 S" Y. e ]; B/ V6 y/ |6 j+ Z! R
end
- i. S0 r' ^! E' y) K) M# v' w" }0 Lto setup-patches
. n$ Z0 i" v7 N7 t8 I ask patches [ set pcolor green ]* f" H2 T7 T* j
end
& r( h) L+ i# wto setup-turtles
8 b' |/ K: K w1 Y( J7 O4 S( y" r; N7 y create-turtles 100" z& U6 u. B+ v' t
ask turtles [ setxy random-xcor random-ycor ]
6 @3 g$ t! b# X* zend% N T9 i/ S' O" N* P$ T7 Z
to eat-grass
+ G: e9 T, P) M6 I8 Q. \ R/ m4 [7 a ask turtles [
" e3 u( v" i7 `2 ~% t, w) @1 ` if pcolor = green [
8 o4 Y! S* h2 i0 a/ l/ [' Q- Y- c) f set pcolor black u9 _7 i- v( f6 v* s2 `9 Z) V
set energy (energy + 10)4 j Q: }% r9 ~1 @" X2 Y, }8 O9 L
]2 @" j+ ] Y$ _) N5 ?/ V6 B
ifelse show-energy?
# u, {5 S& Y j$ s [ set label energy ]
5 h) x# I. l v) O. K9 z [ set label "" ]6 B; }0 S& W4 Q+ Z! V
]
T2 M/ L# j6 d, k3 ^end
: q6 S8 U6 z# yto reproduce
: J2 ?3 F6 U2 |) N; Y ask turtles [
5 v% e# K0 `/ r* }+ G if energy > 50 [
5 g' P2 Q9 y0 I4 a3 U) ^ set energy energy - 50' @# K2 ^9 R4 G2 t
hatch 1 [ set energy 50 ]
) Z0 i/ M% U% O; M8 F& |3 y ]/ o8 j M1 K* r
]
4 M8 I! D0 z8 l" w/ m$ Bend/ x% g- s$ X# R7 Z& Q! f- s/ p
to check-death" ~. Q+ J P- F' }
ask turtles [2 o, h5 ^( U8 R2 F" f) ]$ j
if energy <= 0 [ die ]
0 p) `6 m7 a( U ]
# o( J3 F* z: _. j4 }' uend8 k# N5 n r5 M, @* G
to regrow-grass
! I0 ?( [: j' M* d2 Z6 H ask patches [' E7 P: V0 L4 h" r
if random 100 < 3 [ set pcolor green ]- g w3 N' j/ k$ M3 m2 A
]
* o2 l' S0 N0 Q& E7 tend
1 {' i9 b$ U( Kto do-plots# V$ A( l9 ?% r5 q7 s: k$ e: `
set-current-plot "Totals"/ S- k* Z" [" \: `0 q* _! E
set-current-plot-pen "turtles"
, j( T( Y# }9 S- {% N/ U( F2 X plot count turtles
$ v2 v% L8 S& B) r set-current-plot-pen "grass"- V" y3 k6 k9 a+ S
plot count patches with [pcolor = green]
4 Q2 N) E" z0 G) l4 Fend
" k. a; t2 N) ^可是运行时提示no such plot: "Totals"
8 {/ J- y! K" l K& Qerror while observer running SET-CURRENT-PLOT* A( U" n1 k: f
called by procedure DO-PLOTS# b' _) v! [- m# T4 X: L1 X
called by procedure SETUP0 N$ b$ S4 @; e' [% F+ Q2 b6 r
called by 按钮 'setup'5 m) z) L5 C/ Z0 |/ p9 A
求大神解答啊 |