我编的程序如下turtles-own [energy]
: u& n3 y; V% @2 ^to setup
4 z# q; ?& `0 Y: C6 m! G5 y0 p5 ~5 } clear-all
* |6 ^$ r& w* m setup-patches
0 F% q; ^* K8 e" g create-turtles 100
1 W. C+ M8 v+ e- x. B0 o do-plots1 d5 l8 y4 u) C9 K& d
ask turtles [ setxy random-xcor random-ycor ]
& n- e D! r |) V% f3 gend
/ z3 U; u5 {3 \+ X* @to go1 A8 O( ?) A2 `! L$ z
move-turtles# i) Z5 V; t% I, e5 N8 R5 H
eat-grass3 |, B; k) T- f L- m
reproduce# L. C6 q U* V9 k- N
check-death
# X; c$ J: T/ S# f) |8 L regrow-grass
/ ]. z" I+ c+ n* |7 n9 g do-plots8 z; E: \- x* K u9 Z& V
end
6 |; g4 E4 P2 q/ cto move-turtles! G3 o; z. _4 w8 K* S8 x6 A3 p
ask turtles [
/ [2 ~8 R9 o; L8 W right random 360' C) D" u/ |6 ^/ i1 `
forward 11 m7 L7 _, u- P: p
set energy energy - 1- s$ `, D$ r' W5 j1 Q
]
3 \" V3 _" I8 {6 q7 f& `/ nend! _9 X H3 f- ]% Y
to setup-patches' J: T* X2 {7 N2 R5 I/ x5 l" L& P/ E
ask patches [ set pcolor green ]
7 H) e o6 W7 Q- C: P* X+ L- Aend( b; _( s- t& Q- W$ s0 W' v: Q
to setup-turtles
1 P- _, a: G' g( V( ]" S: K create-turtles 1005 I2 A3 e, n& d
ask turtles [ setxy random-xcor random-ycor ]2 ?+ ~+ h: e2 P9 T! h9 |
end
+ ?8 F! Z6 V# ]" Tto eat-grass
. H* p8 Y: p- i1 | ask turtles [
1 ?1 K) w3 j( G3 B if pcolor = green [
/ s3 X& x7 J J2 D4 [. v+ w set pcolor black+ `$ I) j- y8 @2 g6 W. J0 k
set energy (energy + 10). |3 P8 b# \* I, S
]
* K) A) y5 k' Q6 R ifelse show-energy?
- e- C' {4 J0 k" x [ set label energy ]8 [ z6 H5 }# O& r4 x$ a4 \
[ set label "" ]
. `4 w( S) X4 H ]) c" F, D+ I$ C: N/ Q- z \
end3 L: N, F( V6 x$ o0 k" B
to reproduce
4 s" B) Q) C" h* L ask turtles [. r* c: Z5 {' x. c2 t
if energy > 50 [/ e' L+ K& C( I3 ]
set energy energy - 50+ }) R/ M2 Y5 L6 [2 g& D- J
hatch 1 [ set energy 50 ]
* L8 |) N9 s9 Z9 e j7 S ]8 q4 j. t. o! O$ m
]
5 K! J6 R; e+ ~( R$ ^+ eend `% J' U; W4 M, p. H P
to check-death
: i; G- g A, \1 g ask turtles [" k2 F8 `* ~# y% m0 x5 L
if energy <= 0 [ die ]
/ t3 ~) m5 k5 N Q7 A# c ]' z& d- }' L* A% o
end) ~. q1 b! |$ v; R
to regrow-grass4 X! Q; M0 o) K" B' r* n
ask patches [
6 h. F9 t5 g6 {4 p if random 100 < 3 [ set pcolor green ]
* n M/ u+ Z0 b% T/ w ]
& {8 X$ K/ R+ c+ @- J, `end
7 q" K6 V) ?( L. ?4 o% P& Pto do-plots: n! l1 @8 J: c. e
set-current-plot "Totals"* f+ X7 V- n: W
set-current-plot-pen "turtles"
( q4 G5 v% S' W; C) \ plot count turtles' d" V( Y: }3 L% \( D$ ?
set-current-plot-pen "grass"
7 j5 T7 K4 Q4 G4 L plot count patches with [pcolor = green]
. u- W4 a' W1 |% x0 g8 H$ @end$ y# \& d* Z) e. d- [: ^9 _" ]
可是运行时提示no such plot: "Totals"5 b8 {$ }! B* h# ]9 A( n$ ~( l
error while observer running SET-CURRENT-PLOT5 z9 ^3 Q; x, T0 F/ v
called by procedure DO-PLOTS
1 b$ X/ w) T5 f3 E, f called by procedure SETUP
8 f' v' F h. F4 M+ l called by 按钮 'setup'. p9 u) M* p, V
求大神解答啊 |