我编的程序如下turtles-own [energy]
5 U( A7 I! ^$ M- vto setup ^9 ?% _+ \: U
clear-all
5 P! X$ V+ w$ \6 k$ g! p+ \ setup-patches9 D( @4 N* V3 r
create-turtles 100
$ u* M* L* A' i3 Z" |+ I do-plots
! j* A. w/ `2 T3 i O; @0 B ask turtles [ setxy random-xcor random-ycor ]
7 W) R( F5 B3 tend
% l1 l$ A9 |. \. J2 _/ {to go
: X J, @5 b4 X. e move-turtles
, ]! \( ~8 W) J' E- s3 z! [1 [5 f eat-grass' _& ]% ]: c2 l. S( d
reproduce) N1 {3 w1 p5 D% k* G2 z& Z# g
check-death4 a8 y$ f Z( ^; q1 m8 z8 h
regrow-grass
$ K- w5 c# a7 k7 t V2 R do-plots% `% u$ L! m1 U% l* ?% ]' `
end$ u) @4 `4 v, t
to move-turtles! D1 C8 T8 l' m Q* [
ask turtles [1 J/ M/ L7 O1 ~: ] Z0 I
right random 360
) F% X& i# M" W& ^( { forward 1) T1 ~ x' K) N- g0 u
set energy energy - 1
* l; r3 z! ?8 P* E( i% ^* l ] m6 Q' o9 `5 s$ F; m% @ v
end
1 ?9 Y7 i& l: T: X/ vto setup-patches
: w- m, ^, b5 d3 X$ H0 Y0 ]; E( K ask patches [ set pcolor green ]
; |# v: _5 a4 x- M. |end1 P$ M4 ?5 L# }2 J1 s$ k" G
to setup-turtles6 W5 q0 h7 `6 f2 Y7 N& x
create-turtles 100
- l2 ~( I4 S w$ g+ b* f5 R ask turtles [ setxy random-xcor random-ycor ]% c. R5 _3 I6 o7 E/ L/ R# y( d
end$ J0 _6 K2 Q* {: X3 n- Q
to eat-grass$ M) Z+ s2 l T
ask turtles [! j( k S1 ]1 q
if pcolor = green [
4 @% c" k3 g- x3 ?* o$ |& E set pcolor black
7 x8 H- t* a( G! }6 E+ k4 k set energy (energy + 10)+ m3 ~, k/ i# S; B/ O+ [; d
] i+ n: F/ y+ j1 w# v
ifelse show-energy?0 }: z- {; ` v" { |+ }
[ set label energy ]0 v' w1 @/ r9 f' K$ h) t
[ set label "" ]
: F7 ^5 U$ i; Z! z9 e" l, [ ]
& ?# `: X/ L/ ?4 f( z1 {7 Uend4 C8 d0 M' x+ A* @' i3 H0 N
to reproduce
! c2 C( G5 G9 ?3 w7 ?, L ask turtles [* W7 H6 o- U0 e" ?! o
if energy > 50 [
" S. T0 r% Z e; O; Q set energy energy - 50
1 @% ~2 C: S) u' h hatch 1 [ set energy 50 ]5 n6 s6 L* ?: ?3 e/ u& p2 H
]
4 B' @1 K, k+ o6 h) Z# ^% A ]
& A% a2 y! X5 Y" a9 y3 hend
* n) k" k- s( ^" \5 m( Y, o/ xto check-death4 _$ z7 K4 L' J% {
ask turtles [
+ \# N' x: ]6 a+ l if energy <= 0 [ die ]
& \# J: i; Q7 Q2 ^# F2 Z1 Y ]
2 l$ B& L7 ]7 ^: U/ Mend
2 B% R! B6 q5 s* L. w; b) Uto regrow-grass
/ d+ O; k- U: l1 P: E0 H ask patches [
5 U5 v5 V" _! u% ?! a& D" S& i* | if random 100 < 3 [ set pcolor green ]& P- T- G# S, Y2 a. |5 j& J! T8 I
]
# h; {. ~, d: Q/ J. H( ?/ tend8 s; f- q6 S/ k0 r: P! C4 c1 Y( v
to do-plots
, f& R" N3 U5 P5 z set-current-plot "Totals"
. P1 a6 V9 T8 d$ F set-current-plot-pen "turtles"
- q2 f' q# Y% o, Y' ^0 B plot count turtles
& x% W0 c4 O. o1 y6 o set-current-plot-pen "grass"
: |5 _- U* a. e6 v8 B plot count patches with [pcolor = green] V z; y+ `) b. ~' n- h2 l
end
$ e4 T- J3 S: r7 t! i/ f1 ^可是运行时提示no such plot: "Totals"
, r4 Y. h8 T4 B/ F/ Kerror while observer running SET-CURRENT-PLOT/ Z: [+ a5 O1 p6 H* V
called by procedure DO-PLOTS
# ?6 t8 d) z* f* K# d! i called by procedure SETUP
4 p: `7 I4 v: s( ], r called by 按钮 'setup'
4 _7 E2 d+ B; ], ^3 e6 _" ]求大神解答啊 |