我编的程序如下turtles-own [energy]* b7 j, k) s4 G
to setup7 F1 ?6 o. M0 B
clear-all% ~* t; y" n5 T$ B4 |
setup-patches
% W$ W! `( r+ K3 e+ W; O9 w4 h create-turtles 100
9 Z2 E) D U' I5 ^ z do-plots
7 \9 w' w7 {! `4 d; z. @ ask turtles [ setxy random-xcor random-ycor ]2 H) {3 W) n! j4 I
end/ W9 ]/ A$ w9 j% J
to go, z7 d: F9 Q3 a. C) [9 w. x0 ~
move-turtles4 C. [* C4 M" ?( b
eat-grass
9 l9 y- n; u. y0 v: g8 \ reproduce
) O2 Z4 f$ M/ B5 q4 ]* p check-death! x% b& H; s" F2 v. F% S' z
regrow-grass' i. b9 B- D# i& {1 _+ H) S% S: a
do-plots! x, q( Y9 Q9 J
end
2 ?% P' h9 G/ t/ ^7 kto move-turtles
# c7 U: o' L6 s! v9 F! A8 ^ ask turtles [: D# E6 V: C$ {8 G
right random 360
' r+ N7 }( V$ M2 X forward 1
. k. `6 F0 K7 @! P4 s; C0 a- ]* u set energy energy - 1+ M# B+ ]5 t$ O8 A: h* ^2 C
]
( _1 T0 m1 N, U, E3 ^end o( z' G5 l7 W% H; V8 X
to setup-patches
- T$ o/ @8 d4 Y. p/ g5 _ ask patches [ set pcolor green ]# t- N/ |8 P7 Q0 w. B) k
end: ]0 \ O7 A, i: s) F
to setup-turtles$ S) x' I' ^+ h& X+ j9 Z& t9 O
create-turtles 100# J) j0 n( |( }$ s9 ]
ask turtles [ setxy random-xcor random-ycor ]' f& j0 c0 o1 l5 U2 M; w. m
end
+ w% i) B9 y- u6 M$ H- |$ jto eat-grass6 I6 E) `- U: X2 F. q- \
ask turtles [, Y5 |, o. |2 A8 m. o
if pcolor = green [$ _1 ~& Q' [% E
set pcolor black
! I6 C. d6 b2 `' |/ b set energy (energy + 10)
4 a7 w& m9 N0 M7 f ]4 {9 X& k4 F3 }+ W. T( @
ifelse show-energy?
! E) I/ s9 ~3 n' A- \$ B; I [ set label energy ]
2 r3 n% F% b+ ?* s# H' i! i# m [ set label "" ]- n- w) K2 z r. C# b( i/ H6 `
]
: R, W7 l) e9 J# r& p& X, gend% x" Q& ]$ d/ ?- F4 U
to reproduce
# ?. ?7 U6 Q) d$ K- R+ o4 [- d" D& \ ask turtles [5 l# ~' ^& d8 Q2 y/ c
if energy > 50 [7 |8 c$ X. d- l9 O7 k. Q9 Q
set energy energy - 505 i8 p' p1 w) g, W7 n9 ? W/ G
hatch 1 [ set energy 50 ]
* n$ y7 K! z& v1 r( T ]
( u- t+ `8 X% { Q* x7 c ]" Z9 X% ]7 w- Z$ V1 |* \
end
9 E% E( t3 _8 bto check-death, _$ h8 J! @2 y* Q3 Q" v" c- L
ask turtles [
7 s S; X5 N% w if energy <= 0 [ die ] I" }4 @, m' k$ R9 Z! @
]( g, d' ~4 I6 ]3 d& V0 q# z) [
end
) C0 E* Z5 U% _7 Lto regrow-grass
0 e. r' K/ C9 W9 J$ ]+ H ask patches [7 j9 @6 S& P3 G1 V1 K, `4 T1 n
if random 100 < 3 [ set pcolor green ]
# i6 R7 l) F0 j2 A ]7 y0 @0 k! ?* j5 `
end9 _6 b3 J3 i/ i# S- N( I6 U: |- s
to do-plots
/ K# l, k. i" t6 O set-current-plot "Totals"
; k4 X7 f t# z0 S2 H5 c set-current-plot-pen "turtles"/ l1 ~" I1 t% u
plot count turtles
1 J6 J7 K. A# H. I4 A% r8 b) R/ P set-current-plot-pen "grass"7 l& p( r; ~ X! Y( f% d
plot count patches with [pcolor = green]/ Z4 v3 m0 x( d: E0 h( P h
end" S7 `4 q: J; y
可是运行时提示no such plot: "Totals"
) A3 L. x' Y/ Q3 p6 Verror while observer running SET-CURRENT-PLOT/ t$ n2 d2 I! B
called by procedure DO-PLOTS
3 `5 ^+ ~/ Q4 L, e- }$ J9 n called by procedure SETUP$ Z4 e6 D. |8 w
called by 按钮 'setup'9 b9 @/ Y1 x" ~4 G. ?5 Q7 o
求大神解答啊 |