我编的程序如下turtles-own [energy]
$ ?* X5 E9 s! L# |* }to setup
+ u, E1 m1 J4 K% _; i% Z* S$ r- U6 J clear-all
- p/ u( A1 [3 A6 C+ ]6 O setup-patches
: I0 j- R- P, D' Y6 Y; ]/ O9 J' K create-turtles 100
) f+ F8 R$ M' v. M* y% i1 u/ ?# L do-plots6 T0 j2 R1 B( G4 x, V! s+ `2 [
ask turtles [ setxy random-xcor random-ycor ]
* g$ \3 ^& m2 K9 m7 w: |end( d% z8 l7 T1 q5 s' ]* F* M
to go7 U8 A" Z n, I3 T7 c# j
move-turtles
# `* T5 t# _6 D) z eat-grass
/ q2 U9 F, }' b2 W( r: N reproduce
( x& ? ~4 n: N: E$ u9 E- h1 M check-death: R# x1 ?: a/ f
regrow-grass5 A: F& Y( K8 f& k% F7 }
do-plots8 H4 C: m4 H- h& ], [
end
8 u: {+ b( w7 z' V% Ito move-turtles
' k- O, b+ g4 T# m$ d9 Y5 ~ ask turtles [
3 f( V# Y, T% e" a right random 360
M1 j- u% D* s$ a8 | forward 1
# j; J1 J, R) [) s; w set energy energy - 1, B2 E: ^! j* g3 E3 k9 f
]
8 ^. \/ r6 X& G- r- gend/ ]( p0 t1 y1 n! a
to setup-patches
. G( Q% \; ]! i: \# l ask patches [ set pcolor green ]
$ N# P- J1 r2 b* {5 lend
1 [2 s& ~, I8 nto setup-turtles
' F" N1 H+ J% o2 y4 X create-turtles 100: v4 ], ? q# A) b' t1 T; b5 k' b
ask turtles [ setxy random-xcor random-ycor ]
5 |2 j1 O5 O* S: j' g+ lend: M$ m0 I: O5 s+ z. n6 l: J" [
to eat-grass% z2 Y: u) l4 Z( o& x
ask turtles [
, v/ D' K+ u" V% ^ if pcolor = green [. R1 Y; s5 B P' `3 i: `) J
set pcolor black
- {7 H+ W# c" [: g$ w' |+ \& E set energy (energy + 10)9 e# q8 x% v- E
]
2 D! d, r' E0 Y- @1 u ifelse show-energy?4 K; \: _% J& d9 e. v
[ set label energy ]
+ s+ h; N. h# Q [ set label "" ], U8 @ M9 {- t% T
]7 B' v. |( Z5 n- c$ _
end0 N1 D D& J# e( n
to reproduce
" F* U- y8 U$ q$ {/ ~ ask turtles [
3 W% t, N$ \4 [; L if energy > 50 [$ o, {9 z! y( y8 w' p7 m& |0 w1 J* r
set energy energy - 50% @5 O' @# G0 q9 G
hatch 1 [ set energy 50 ]) o$ h, }8 y6 I
]+ c9 Y2 U k7 H( B
]
+ t" G5 l- {4 S7 `* W* o. fend
. p! P& N: Z' J9 |0 nto check-death
9 ~. q# o. d: A' ?" x ask turtles [/ J* c% R2 F6 R9 b& j
if energy <= 0 [ die ]8 F% l. w% s6 A8 K& L6 P
]
; g A d1 i5 G$ \6 I4 F0 oend# F& S# m0 e5 j- w9 a
to regrow-grass* p2 B' G3 S: \; r2 Q3 G
ask patches [
0 v% O! ?" {) ?4 n Y! C: f' Z if random 100 < 3 [ set pcolor green ]
E% A- i" J4 v! { ]/ ~5 l- f6 g9 J# l2 c5 K/ i# ~1 U2 V
end
) l$ J0 J+ `8 s1 q" I2 N. `to do-plots
. j! y) o. f0 M set-current-plot "Totals"4 w+ a0 ~. q1 m8 E7 n
set-current-plot-pen "turtles"/ p( W; N8 S+ J, {1 O* n0 Q) J& E- I
plot count turtles
. D R1 m# H) X% ] set-current-plot-pen "grass"$ v' p3 b2 h9 T( j( F
plot count patches with [pcolor = green]+ Z& D$ ?& d( n, O4 l$ T
end
" V9 L$ J) g" Z, |& E8 {" t$ u可是运行时提示no such plot: "Totals"
4 J' a/ t4 p0 S. a# e) h$ Aerror while observer running SET-CURRENT-PLOT/ V1 b' a9 ^& V% r' \6 I
called by procedure DO-PLOTS
5 a4 H s# H6 ~0 r& h! Q2 o called by procedure SETUP
! ?0 u1 H4 z5 B5 J9 D called by 按钮 'setup', u7 d! y& Q2 _. R" B& ]
求大神解答啊 |