我编的程序如下turtles-own [energy], G, n- f/ K7 g+ Z
to setup
# ~& @3 }' b; C clear-all
: q* X6 B& t0 i# q setup-patches
0 }' l+ g' p4 C/ t create-turtles 100
5 F9 ^; X# Y9 ^ do-plots r: N+ D5 k* L3 E/ S; A$ n: b
ask turtles [ setxy random-xcor random-ycor ]! x! v# I7 C- _ {8 C' a
end
7 p& S H: [! \9 w( E. l; |to go0 r4 r1 e$ N3 d3 G& v Q
move-turtles
+ ~: C/ l0 h7 l9 `' r' K1 |, E eat-grass
! Y3 C0 S! ?. r( N- S6 L reproduce
" p! S, y2 b+ y check-death5 _1 }! l$ V# _9 Q
regrow-grass1 [$ o+ y* @7 c, N
do-plots U& i) U9 o+ N
end
4 p, z% P: o5 {2 q' }to move-turtles
8 _% Q6 N3 b4 ] ask turtles [
8 T, \7 c% ^! \7 q right random 360
- S. B9 H; d _$ U, G9 Z forward 1
/ F) x) ^8 G5 ^5 d2 O set energy energy - 1. b+ ]# \. e- i G7 w
]% y8 e Z$ ]- ^/ z4 F
end
5 ? p3 u1 F0 q# y- K; T4 z) B0 oto setup-patches
/ U) ?/ \- V' Y. ^ ask patches [ set pcolor green ]; j% x0 K5 R- q: J8 C
end ^ s2 _6 P' V, ]( j# x
to setup-turtles
8 l( ?7 Y% ^; w: R" p2 v create-turtles 100
3 H7 f: j, p4 D0 X ask turtles [ setxy random-xcor random-ycor ]1 o. c C" I ]1 I" @8 P
end& T5 p+ A' ?8 }- r" Q8 |3 ]
to eat-grass
0 X# G2 B: u/ T, F% n ask turtles [- c9 S5 F7 a& x6 p
if pcolor = green [
( U$ C! h: F0 W set pcolor black: B# ]' j8 D/ U# d& C1 V/ [1 A- h7 X: V
set energy (energy + 10)1 K0 X; `: C9 A3 ]9 k. y8 @2 F7 M
]
4 a2 ^" c2 w/ M. B) p9 I- ?+ W* g ifelse show-energy?- B2 [* {9 ^4 Z6 o" K' i0 x
[ set label energy ]
5 s4 ]% m9 n0 S" E' U. G2 m$ \ [ set label "" ]4 i; H+ R) f/ C& E% b
]0 w- o1 M; [4 ]- D4 d+ D5 F
end
5 c- ]' J7 S/ H" D, Q! f+ rto reproduce
* p: J% P, ^$ Z5 P7 ~ ask turtles [1 d% C) _9 v% z) f: ?$ U+ D
if energy > 50 [
( D/ o- I/ S" Z& U set energy energy - 50% F2 K7 ]+ D/ l% |
hatch 1 [ set energy 50 ]: W" a ~ d* \* l9 R9 y) K
]
$ Z0 O# q% w& r3 V ]
5 |7 S, I; C5 K4 v3 R) d. uend
K4 V& z1 }3 k( F8 K3 @to check-death
2 F( I* E9 a" g7 q8 V! H; m$ g% P ask turtles [) N, w4 _3 l7 K- V' }6 i9 D
if energy <= 0 [ die ]% |# ?; M9 y8 ]- }9 E8 C
]
. L3 G$ C$ Y3 z& b8 U4 g1 }: M H! {end, b* X" @8 d( _+ _
to regrow-grass! e$ y- \* {- j8 Y. f$ d. J
ask patches [: e% s7 W( o" J& i
if random 100 < 3 [ set pcolor green ]. [1 u o, I5 C' |( G
]
* x4 i: r& x L) V2 [end7 P6 T# B, B. ~* Q# R% m
to do-plots% y$ s" B. \5 I# L) A! y
set-current-plot "Totals"
" ?9 Q2 H. ~$ H; V1 L/ ~* W+ u set-current-plot-pen "turtles"
/ t! M# h' o" Q' u$ s6 f% X" A: R plot count turtles
* s2 O7 V3 U( X; y" O set-current-plot-pen "grass"0 A) J1 p; j9 O q
plot count patches with [pcolor = green]
( ~# e3 u+ t5 Kend
2 I4 \* N4 U/ d1 s# I/ \% ]8 c可是运行时提示no such plot: "Totals"
2 C; \( q: p" M. }( O9 U cerror while observer running SET-CURRENT-PLOT& R; N R4 q/ J P/ u4 k& `
called by procedure DO-PLOTS
, H1 K! A9 a) t9 W/ o called by procedure SETUP7 x" v* @$ q" K* _
called by 按钮 'setup'! A" V- |- w4 ~" ]4 H7 w: i9 l
求大神解答啊 |