我编的程序如下turtles-own [energy]
0 t$ l! i9 I, W5 m5 y; jto setup
1 J5 [* K. g! W6 H R3 ` clear-all
! v9 n5 i! @8 A8 t8 ^3 Z) I9 c setup-patches/ L, f/ e2 @- y
create-turtles 100
5 q5 I' ]. Z4 f8 C do-plots. z" }: _- q* [& e2 e
ask turtles [ setxy random-xcor random-ycor ]
) G, p P- B# v4 l2 @& m, ^+ pend4 D- g. ~9 a1 |& E% p" A
to go3 n) g& u7 x# p: k. \8 e8 z v
move-turtles
. F$ {+ Q6 O! ]+ J4 C |1 Q eat-grass$ {4 ^+ b5 u3 D' U, F" R( U: Q
reproduce
0 u* j" @# c A4 r' k! A5 f& Q* U% q check-death
' ^5 j7 k; r4 Z2 W* N9 H+ B; Q7 F; M: p regrow-grass- Y4 [1 Y8 Z2 l* `& U! R
do-plots' M9 K$ X, Z( R- ^; g+ b
end
, R& X" A6 n3 W" T/ B6 x; B) fto move-turtles. e9 Y6 V8 c, n: y) Q% _% D
ask turtles [
4 k: N; d+ @( O, d right random 360! [* Z6 O1 H# F! E# V' s% c
forward 1* @3 o$ [" [/ w$ x2 ^: ~& _
set energy energy - 1
9 ^+ ?2 y1 j8 H0 S" Y ]# n* }/ S8 O! G3 N2 a, S
end, e6 i) o/ w. ~
to setup-patches
/ f, d" q+ ?& t3 N ask patches [ set pcolor green ]
5 H& n7 v$ R: j; t0 gend+ e" n* v: o6 d A- |% q/ m
to setup-turtles
2 e G9 q! I' ?3 h+ u% n; g create-turtles 100
5 Z$ v5 d# ]' A2 o( z8 | ask turtles [ setxy random-xcor random-ycor ]
% V+ @& b8 D+ H$ S/ Eend
, C) a( o4 ]3 B# H- M- x2 Vto eat-grass
5 B9 y* Q1 \' m. j+ h* Q' m: E ask turtles [8 w' x' U: ~ P$ A
if pcolor = green [
. M9 @/ j% O% k) {4 ]& [& y( t set pcolor black; k" @# w3 y* Z9 K5 y0 Y4 v2 ? n+ {
set energy (energy + 10)7 w+ i1 c/ F+ N& M" g7 `
]) F* x) W- u1 {- H$ r
ifelse show-energy?! I# C8 T% c3 J. x8 ]- x) I8 v
[ set label energy ]7 U4 o* o& K! r' m
[ set label "" ]
/ h; o) H/ M% N* c7 j ]* \0 J; |+ d4 C2 k
end
5 r2 T5 z" C% p. K- H f( a9 Tto reproduce
( {9 B) I* Y: o, [+ T5 \' V ask turtles [
. j* T* r& V# k0 ^, N5 P5 { if energy > 50 [
. W: Q, j3 M: @- W4 S. p) f set energy energy - 50" h( S0 k X. d1 a2 a
hatch 1 [ set energy 50 ]: N4 M- I# v0 F S2 M
]$ Z& k, `& G2 C! W
]
4 I2 \4 j$ }4 G# p, V! ~6 T% @end9 l0 W6 P6 j4 \4 M4 U
to check-death
! D4 |) Q6 f* t1 z. X! p ask turtles [
, G2 U- M t6 U% W, C5 F8 ^ if energy <= 0 [ die ]
3 E6 P9 Q9 Q4 i8 `" p% f ]$ ?7 Q: D3 a6 U2 a
end
# m4 i; h' q9 X5 P9 N% p) w5 jto regrow-grass
N( _& F7 p1 C$ ^* f* H. ]; R ask patches [
0 [+ z0 w- V$ k, G if random 100 < 3 [ set pcolor green ]
3 n% v! F9 I4 Z- v% e. G$ E ]
# ]0 E) r7 h+ d. Fend1 M- U" P9 {; ]* e" i% j. z
to do-plots
$ {8 v* U: K1 i9 C$ T u set-current-plot "Totals"" P/ E! C% w v5 V d$ N2 w5 I
set-current-plot-pen "turtles"3 @: q. T3 j' b& e6 `( ~5 F
plot count turtles; ~) [+ J! H. W8 E8 a. S2 F
set-current-plot-pen "grass"
0 V$ q! t/ N: n8 I7 Y. O plot count patches with [pcolor = green]. d" n. k a; O8 J
end
$ A; M. x: O. E8 s4 g2 b可是运行时提示no such plot: "Totals") G8 v$ s2 ?* X$ Q# @% f4 M
error while observer running SET-CURRENT-PLOT
4 W4 ]7 J L1 d called by procedure DO-PLOTS
6 B* ?1 L. q/ Y/ o. ^ called by procedure SETUP, S6 v6 U6 ^9 E+ ]8 ?# n5 |
called by 按钮 'setup'2 G5 z6 a5 F. n- e# i! l, {& v
求大神解答啊 |