我编的程序如下turtles-own [energy]3 x/ f6 M" C2 v; r- Z$ M, _0 V& t; s
to setup- j- Y. r: y5 Y0 g. t& F
clear-all
! N5 d7 d! T8 ~7 D0 k, t9 D setup-patches' H& X1 q7 k; l: S7 f
create-turtles 100! d! N) s& x' @' O7 N
do-plots+ @8 N0 x* M! @, k
ask turtles [ setxy random-xcor random-ycor ]4 Z1 j$ L1 ^/ d( V
end
# r* g4 ~& Y8 S, Xto go* K$ v, \$ S7 ?0 Y
move-turtles
! ~3 a% h3 f* G! p6 X eat-grass
5 O4 o Q3 ?$ I5 F" h' Y reproduce
( e9 d. R: U9 x7 X0 }8 r" R: r check-death- o( w8 u. B. N4 d3 Q* S
regrow-grass
+ R8 A9 m$ c K0 h, _ h do-plots
3 w: L2 m7 \! U; Lend
+ W: \, v1 w+ t* T7 Sto move-turtles
$ ]' F( W% ]1 |) b- D& \2 X! }! ] ask turtles [' Q6 F) y( p5 [" u$ k% V4 `, K
right random 360
5 ~. |! T/ v9 a0 ^2 V1 S forward 1
( x1 J; `. x1 w% G& y. | set energy energy - 1; T# _3 v3 X U, R2 K' P# ?( b
]
, W5 U$ i3 F* [* r3 t# w% K- Tend
8 T2 ]( `; s$ m$ t0 N3 p9 Lto setup-patches; L" l7 j5 `$ Y/ e4 @
ask patches [ set pcolor green ]: [' n7 H" `4 V9 a" Q
end
3 w& c: V+ C7 L" W# a1 Q+ hto setup-turtles
! B' i' U$ {% X6 ?# U% F create-turtles 100
. q7 w ` B2 u2 f( k: ] ask turtles [ setxy random-xcor random-ycor ]3 v4 g, l2 H# r: u+ a; c$ a
end( S. k+ [( ^, y6 @
to eat-grass
# d6 @% Q; M) o I5 q: K ask turtles [: M0 a w u& X4 _2 W! s, G1 E2 B
if pcolor = green [
1 Y) \9 Z; {# x2 X5 A/ c, q5 A" I set pcolor black! O4 j% `+ w; h2 W
set energy (energy + 10)
& @7 x: f# x+ K3 ] ]
x* `% u" u3 t7 Q ifelse show-energy?
5 w/ [( n- {, @, o+ _/ h [ set label energy ]+ d$ T+ f% P* ~7 ]: R
[ set label "" ]# K0 W3 c( r# x9 B' x- T
] v1 C: I0 v& y# D; ?) j
end1 k$ J5 b, A8 ^2 g5 I
to reproduce
, o/ O( E" u1 S! Y2 h ask turtles [; r" e$ F; t7 P
if energy > 50 [2 h3 {4 l' C+ Q$ g, H; r5 X E
set energy energy - 50
7 u; O/ v% e$ ^+ }, v hatch 1 [ set energy 50 ]. X( M2 N+ Z6 j0 g6 {
] D+ {/ y& {- m$ l& ]8 N9 D' J2 n
]
0 l' Y O# [. Q" Q1 Z9 K% _# pend& j4 T3 ]5 c+ p' ^" L
to check-death
: {1 q# ?3 h; Y: _% X3 B ask turtles [
# i* F( Q9 i$ H' o/ g- G if energy <= 0 [ die ]+ d2 V# U" H5 v1 f/ w7 ]
]
$ w* P, W7 W) {, Iend
# E* c" d& ^* Z x% Y7 V7 Kto regrow-grass
. a3 E1 O2 y& l, n ask patches [+ O" X3 N @# Q3 }- H
if random 100 < 3 [ set pcolor green ]* ]5 K" o6 T2 T w* u- H+ @4 S
]/ R% O0 L2 `) H
end4 l0 Y- M5 P: [# ?. U$ C9 U4 b
to do-plots
6 e m9 k! W/ T/ Y* D8 u( N! ] set-current-plot "Totals"2 j$ V) u5 n" c0 l
set-current-plot-pen "turtles"
1 u8 Z) W* [4 k2 g9 M plot count turtles# `+ c0 f) l5 U A5 W& Y
set-current-plot-pen "grass"
8 x9 O4 s: B/ | plot count patches with [pcolor = green]
: J0 z& D! u% J1 f' |end
- E5 f% |) W/ g' H+ t7 l可是运行时提示no such plot: "Totals"
; K1 R5 W8 ?+ _; H5 e4 |error while observer running SET-CURRENT-PLOT
% F( V: X% J+ f7 ? called by procedure DO-PLOTS
3 y( Y n' N6 n c" v, R; @/ C called by procedure SETUP
$ L- U" T+ i) w" ]( V8 _, ]5 \ called by 按钮 'setup'
; V% H% h* n' G5 G求大神解答啊 |