我编的程序如下turtles-own [energy] h! F7 d' g: P- P3 m1 K4 f
to setup( m# G' M* K0 B$ L2 y i
clear-all6 |% c2 L O$ A# J T: I% s8 V
setup-patches4 ]6 B* L9 `8 |2 ]; ^
create-turtles 100
( X3 v4 o) }5 C do-plots. l) C b) ]( v# [$ Y% T8 t
ask turtles [ setxy random-xcor random-ycor ]
6 P- E/ g, l9 W+ \& E! G( Eend3 [. x8 s$ k% s; x
to go
. Q5 M* @! v5 u( ^4 [ move-turtles
" H* {& i- Q+ B6 O eat-grass* n+ |3 @/ S# Y$ Y/ H1 v
reproduce6 x; t3 }( R& C/ {7 ]
check-death
7 i* {! ?; E2 [$ ~. O1 I regrow-grass9 o0 S3 i9 _% G: P5 a- K7 i- @* n
do-plots
5 K9 j: y1 h2 J* p4 c. A. Kend
% ^+ d* d. `/ x& `9 Q* Tto move-turtles
. F4 B5 E" K% c, b4 M ask turtles [1 T* @% ~- r- t, d' T
right random 360
. C5 F" _& p3 N. ~9 E" a) d( Q" h forward 1: t# }8 R- `% L1 [- p
set energy energy - 18 U' p9 S6 A3 f Y, w( B F5 D
]
# r: d* p& D5 ]$ hend
7 a" s% |2 I/ D& rto setup-patches9 s$ t6 u V( q1 j5 U3 m5 {
ask patches [ set pcolor green ]
- p! Y8 ~- z' {end
! V, M; ^1 `% \, t. S2 c+ Zto setup-turtles
. I, S) Y7 b: l! d create-turtles 100& b1 K0 r9 i% _4 ^2 g6 f
ask turtles [ setxy random-xcor random-ycor ]
+ \( }& H6 h) A/ v5 U3 R! G6 N- Pend
1 F0 Y" E; A. t+ r0 i% Oto eat-grass
" M/ o' b0 e( z9 c( S ask turtles [
. _0 @# ~. @+ ^" a if pcolor = green [( k0 n$ z1 g4 Z- i1 R5 ]5 x
set pcolor black
: t8 @. x) W" G# p3 c" i set energy (energy + 10)
. t+ @8 C& f3 a4 {2 t ]
3 |; f* ~0 C. o8 p. E ifelse show-energy?
: g3 c" S: Y. k: F4 A [ set label energy ]. E9 B+ z. y+ J- ]1 C
[ set label "" ]
E {$ e# Q/ Z1 s8 j- I8 _: u ]
# S1 P2 ?! ~: n1 x3 W5 b' Q: Oend" R& u R1 Y! Q, p& ~1 s$ |! ?
to reproduce4 o% \4 \6 B0 n" Z
ask turtles [" P3 k4 Z4 T! A& y( _, J6 Q
if energy > 50 [* s8 G! ?9 t2 e* ], l6 a# J
set energy energy - 509 J' O" q. u$ Q7 D E4 }4 t
hatch 1 [ set energy 50 ]
! `' M: C0 J; U, W5 q ]
# X0 x2 n1 g; Y' W) v8 @ ]! z. d( T5 a4 D- K7 z
end
9 X% C F% L$ l. m3 y! yto check-death2 ^; S6 w( h, l7 a8 [ Z- b: [
ask turtles [5 X v# X! i' K2 @8 V
if energy <= 0 [ die ]
8 n, ?: v+ d5 g* z ]( \ i6 X2 }; R7 k& D
end! V% M1 S' j7 }; k8 Q# p7 D
to regrow-grass
3 K0 e+ c' i( H' U, a ask patches [' Z' @2 b6 E2 X! N7 p ^; C$ f
if random 100 < 3 [ set pcolor green ]
4 V- g( {6 _6 o1 F( H# M U ], ~) c* N1 h; z: a4 C/ S9 O
end
7 q& b. \+ d5 P; {to do-plots
6 |% e5 p) g$ y p set-current-plot "Totals"
& _- y; q# V- Y# ]( `& H set-current-plot-pen "turtles"
" `( r- O* r, }& q n plot count turtles
& Y8 W4 x6 K% q$ S8 {& j3 I+ s set-current-plot-pen "grass"4 s1 D6 N) N7 o" V; e0 [) E
plot count patches with [pcolor = green]
/ u1 G% ]0 w* jend; [$ N! x: V: x
可是运行时提示no such plot: "Totals"$ y* Q% A E' Z1 h0 T/ U; b$ W
error while observer running SET-CURRENT-PLOT
" d, K9 X' J3 o2 ~8 j' m+ C* v called by procedure DO-PLOTS5 I3 M+ D! u' n/ `$ [+ m) n9 P6 I Z
called by procedure SETUP8 |4 R2 I3 N7 K* s3 V- k. |
called by 按钮 'setup'8 K4 J0 Q+ I8 p( \# J+ A* G5 v$ p
求大神解答啊 |