我编的程序如下turtles-own [energy]! Z& F2 I# e% e
to setup
4 h2 ]$ t0 a6 Z" q- L clear-all6 K0 F( R, C: i* Z2 z
setup-patches
% a" v1 w5 I& Z create-turtles 100
* c" O% S1 l1 {) H4 d/ \! B do-plots
5 ]4 q* g: v I2 i, o/ u7 f ask turtles [ setxy random-xcor random-ycor ]3 s# A/ m0 o# E3 W( M
end8 w$ H- ~$ u- k6 z) Y! @. T. [" p
to go0 S( b2 z0 s+ g4 O+ A
move-turtles. s9 l& i0 a. j8 [5 L' y+ J
eat-grass7 v# h! G( W$ H6 x* {
reproduce
. i- ?; i, w3 i/ [9 N check-death; f, Z: x$ \2 n, P: Y, P- j
regrow-grass
4 z+ Z- a `# u, C% V& b, n0 P do-plots3 l+ V6 g* `2 t+ d
end
/ r9 Z9 W9 P p0 i0 ^1 b3 j1 V uto move-turtles) K, c, Y; _3 {0 Z+ J' w; H; ^
ask turtles [2 q; Z- Z8 j+ x. {5 i
right random 360. _1 W/ x$ P. J# w8 M4 I' X
forward 1- A1 ^* `9 V, t* f
set energy energy - 1
/ \7 Q% ^2 q/ R' I7 B! {: T ]
8 A% o; `+ @" |! i0 xend
@ G! P- K% |$ m2 Ito setup-patches' ^0 q; E, [6 O$ h
ask patches [ set pcolor green ]
* d1 r! Q! a/ Q" Pend( |- Y- d$ [, n9 u% S! _
to setup-turtles, `6 G' D7 o' @
create-turtles 100
% R) \' G1 l4 ~' R3 T, R ask turtles [ setxy random-xcor random-ycor ]4 l1 H7 Z8 k9 e" D2 N
end
% T; t t6 V6 m' L) Yto eat-grass
' F; s) r. G+ A2 t ask turtles [/ J8 X% Y7 w8 }: y% g
if pcolor = green [! F) |5 N( F3 \3 O" O d: P2 x/ r
set pcolor black0 r' s" |1 m6 z# b& [( Z: k
set energy (energy + 10)
+ G5 ^% y) t% t1 o ]% I) {3 j9 T5 w7 `" v) j9 a
ifelse show-energy?
: _0 D" {8 j# p. W g# c7 C [ set label energy ]
' u4 R1 N% s- B1 e$ E [ set label "" ]+ D' G6 R! z, H* \8 @1 p6 b2 U
]/ `. ]6 K0 |& T. u% W/ L5 K; S. S
end6 E/ Z1 \6 o% K L5 C+ G' l- Y5 L
to reproduce
' v/ x5 o( B! D1 O- _2 y2 u ask turtles [
1 m1 F" ^3 E/ G- L I$ g: N% F if energy > 50 [
+ e3 m! p; W1 O0 ` set energy energy - 50# w. n6 C/ O8 V- y9 T& ^9 Z5 N
hatch 1 [ set energy 50 ] E8 a# L% H) [& f+ o
]2 [- h/ R4 o+ \' u( B) y
]
_! E8 t: V1 F* D6 Z, G7 |8 mend
, t' L5 E5 w7 ^' E7 u8 wto check-death
; j: z' T, I6 W& c ask turtles [! F6 n: r1 D# t( W' x3 m3 b
if energy <= 0 [ die ]$ x5 ?- D( m/ R G
]
# w4 M1 m, T _0 z2 aend1 g! p* C5 p2 a% y) ^( K
to regrow-grass
1 g! N: Z+ I4 ^& A ask patches [9 Z; i* y8 D8 j/ Y8 E
if random 100 < 3 [ set pcolor green ]
8 J+ F3 @. G2 w( _# p) y% g ]
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to do-plots
) @/ t% _/ t: ]4 o$ r3 S set-current-plot "Totals"
* ] d2 v. }1 T/ O S B set-current-plot-pen "turtles"
0 I5 w4 {# a! ?( P! W plot count turtles
6 E( [% s* u" h# U set-current-plot-pen "grass"1 Y9 s- s' @" d# }
plot count patches with [pcolor = green]
' \* Z7 H, @" L3 _/ A; W" rend# k, U- q& o- I# X1 \# k
可是运行时提示no such plot: "Totals"
, Y/ l' ^: ` i3 D" O* R: Y' W, v/ herror while observer running SET-CURRENT-PLOT
8 X. o1 t; _: D" e( ?4 E4 x called by procedure DO-PLOTS
- e V' V* o; E: }2 f9 Z called by procedure SETUP
( u5 f) Z" B" a: ^/ O. w8 w called by 按钮 'setup'
/ _. H* } m$ R3 e求大神解答啊 |