我编的程序如下turtles-own [energy]2 }: a, G0 f9 p% G5 G; P
to setup
: S9 |) c# ?( S- q: p# G# X, |4 S clear-all
8 L) R4 r X! L4 H$ } setup-patches. a, p- o! \9 A* v+ v1 n- R0 `; }1 k' l
create-turtles 100! ~# O0 p0 F# ]/ b. H" J+ b' n
do-plots
5 S" V& ~2 U3 f+ [ ask turtles [ setxy random-xcor random-ycor ]/ }* D1 m% s) ^$ |. T. g9 y
end- U3 c7 N3 X, g, z# J- p+ m
to go; K1 h; o# Y( z4 i/ e
move-turtles
?+ w. a5 I6 t$ z9 } eat-grass
! z3 W8 Z2 W/ x reproduce( o; m5 U( K* ~. p9 C, J' p+ ^4 q
check-death* J. G/ c% r, m- W9 H8 j
regrow-grass# M) S D$ A e
do-plots3 ~+ P+ o% {! D5 M: r
end
& ^! A: W! x! F nto move-turtles
9 K5 R V2 c! R' e0 ? ask turtles [
9 N$ x+ K; A! j: f right random 360
* Q% H1 m* ]& H forward 1) o: _1 l4 w) |( K& |8 Z; p
set energy energy - 1% h" u1 z% D! D- i% z
]
$ ]& Q: D$ w6 A5 P8 f% Dend
$ B( b, \; e8 v* S: c0 [6 Hto setup-patches
: C e9 o+ P/ a7 q; R6 C ask patches [ set pcolor green ]" O9 N, O0 x" p7 d1 O
end. k) U1 O; m9 \2 u/ i7 l$ A2 E
to setup-turtles
$ G O/ q% P' c. N create-turtles 100" {# u W. i* E: W
ask turtles [ setxy random-xcor random-ycor ]; \% _1 b. ]0 m& B6 C
end3 W8 l7 w0 k- }7 i- x2 a
to eat-grass2 z, C8 e1 G" X6 Y
ask turtles [+ N. W' j$ o3 E( |
if pcolor = green [' e/ y+ b- `/ o0 Q0 O" e
set pcolor black
8 F4 s& U; M/ |1 V" ~$ } set energy (energy + 10)
3 j( f! W3 T, q. a ]
6 ?5 X5 Y5 z. N) S' d) P ifelse show-energy?! T& Z7 j+ T" _6 J. [% J, X
[ set label energy ]
* I5 s& j" @) m m [ set label "" ]! [6 a; Z; K: @8 {. T
]
# g8 v, b7 W5 V& z- Zend
P5 S$ U/ b0 M. g& I+ w8 sto reproduce
3 Z) K; a4 g- [ ask turtles [8 L5 z1 K! D: }
if energy > 50 [3 j0 e8 j+ ]. n2 G v6 C# ~
set energy energy - 50
* L3 r2 W! V" {! V, b* Z. _ hatch 1 [ set energy 50 ]/ D& R& h! _+ L
]) i) o) y! H9 B, g( L- d
]
4 [2 @/ I: W, A6 D) \. I) uend
# [1 `' G. m3 p! \$ b5 K( V1 ^/ _to check-death
' \: w# D- e% l$ M) a$ g ask turtles [# N4 B4 Q' s! Y0 W3 t4 {
if energy <= 0 [ die ]
3 k/ v+ ~' A7 s7 r ]
1 z! s# e% H8 uend- m* t0 E, X4 t, Q6 {" t
to regrow-grass0 \: q4 B( L0 Z0 P, Q! ^& O
ask patches [- Z8 J! z/ y/ Q8 m
if random 100 < 3 [ set pcolor green ]
2 ^5 k2 N& }8 ?/ f ]4 Z; y9 h, [. }* ^
end
: `+ b, Y8 H' m$ } Vto do-plots
. [; r, F7 o1 ^6 u! i set-current-plot "Totals"
Q" _+ T5 p( T, e; K8 {- I- q4 G set-current-plot-pen "turtles"8 K$ l( \9 l( S5 p' V
plot count turtles6 B! L4 r- ^3 m. e7 a g+ K
set-current-plot-pen "grass"
O- {/ f& H& K Q8 W plot count patches with [pcolor = green]; G4 o/ `7 i3 a+ E1 x' d$ u; B% }
end+ y' H) \0 F3 B
可是运行时提示no such plot: "Totals"
8 X2 a9 ~" |4 v$ Z+ }2 p% U. D) a! V! n- Rerror while observer running SET-CURRENT-PLOT3 |5 S1 ^! F1 C0 j; h. u
called by procedure DO-PLOTS
( m( v8 [3 c4 b) {4 ~+ D called by procedure SETUP
- e3 }. P2 C. ~- R/ g( Q5 ]+ B called by 按钮 'setup'' W( i5 ~- V* m( u
求大神解答啊 |