我编的程序如下turtles-own [energy]
; o& ~6 {0 h- q1 Vto setup( X- l% O* W1 i
clear-all
) [+ E# g' d( X& ~/ ]" t; j setup-patches
: `; J; u2 `+ P, J5 c create-turtles 100- w& Q0 P, l g
do-plots
, g1 R$ C# [$ }. J8 c `" V" j ask turtles [ setxy random-xcor random-ycor ]
" {4 ], H5 {- ~3 w9 Jend: ^3 {' _ R% n/ s L6 Q9 J" w2 R
to go- }* c0 p. \) p/ T# {
move-turtles8 a( W$ j% p3 \5 F
eat-grass- ^9 T- H4 t& t0 k% N1 s* Q
reproduce
/ l, C- x$ ?, T" d2 h; ` F check-death
" q" _5 Q; m" {. | regrow-grass- f: h1 i4 d' g- q
do-plots
3 v8 v. v6 h& D5 E7 M& O/ ^) ]+ y' R: Pend
: X0 T; L0 w. K; Uto move-turtles( @8 m1 z! f" x3 V1 f% B
ask turtles [
; X) ?5 Z. {6 c; A( i( Z6 u F: Y right random 360
6 ~4 J( V3 t. J" Z) o4 {: R8 d forward 17 V" T& Q; W" |% j1 N+ X
set energy energy - 17 S8 q; J+ k' U& e, }, k' D
]
% \3 L, d" e# W# u9 N* Y* vend
3 z1 s2 D5 v& Wto setup-patches
( W6 j `2 i/ [; i$ T' S ask patches [ set pcolor green ]+ {& N0 t0 K$ ^( ]& ^
end
2 c! z. V( g% ito setup-turtles
4 v8 k0 d Q+ l. \3 m$ ^ create-turtles 100
3 Z- Z. U$ G) u% O ask turtles [ setxy random-xcor random-ycor ]
1 ]7 D4 e6 l: A$ V- Wend
' _7 S% }2 E- _to eat-grass
/ i) Y% l' K& `0 E* `8 W G ask turtles [% V4 d5 j. w4 `! u& G7 q2 s
if pcolor = green [
/ i3 F. W0 _- l, S set pcolor black, P. ?; Y- p& s; m. a5 V
set energy (energy + 10)7 Q5 _# ?$ V: v. v. \& D0 [
]
5 y9 A- H4 d: b4 [' k/ @$ j ifelse show-energy?6 _2 k) S/ d" C7 G& P
[ set label energy ]. p5 l$ H5 m) x( ^/ a# O
[ set label "" ]2 \! N, `4 L+ Z0 L
]3 o# p& M6 |" y$ I0 l8 P
end
% p- `4 s5 v8 \to reproduce
4 s; d9 t8 s# Y/ M! {+ R6 E) g/ C ask turtles [
3 y+ m* f' o1 M* J; P$ B if energy > 50 [: X) Z0 L) l' o5 s, T
set energy energy - 50
- } @1 i5 t9 T6 ]. |) ?+ T hatch 1 [ set energy 50 ]! Y: v+ Q6 n# i& A$ G9 V
]
1 u- `0 {- l. h4 {/ Q1 X ]
. }( B! h/ Y; b! eend
C1 g" M. E, D5 `to check-death& N: s. [% V$ ^' t) q! ^* l g
ask turtles [* q8 k8 |4 T; M& \9 A% \
if energy <= 0 [ die ]
! c8 u. o& O( ]% u* N ]
/ P9 \% \- m- Q dend
0 [" m3 ]1 x! ]to regrow-grass
/ U/ y0 C/ o9 L6 v' @9 Q7 b' p& a+ Z ask patches [
' q. `' B( O9 x# l$ o0 U0 d; C if random 100 < 3 [ set pcolor green ]
' K2 N" I* B* P ]
( }# \. x9 Y8 H0 h9 ^! U2 f# r9 Gend6 o5 O1 @ P" }1 E% ], U" [
to do-plots; ?/ P! m% m4 |5 v
set-current-plot "Totals"
: N! U+ O& T7 ? set-current-plot-pen "turtles"+ e, \6 I) p- w% D3 F
plot count turtles
3 n4 _) o' n! L: ^' R3 ^ set-current-plot-pen "grass"
4 W) f0 e- k$ l* i! X plot count patches with [pcolor = green]( X7 z- R, f9 z2 k) P
end
7 X$ \# t( e' E" r可是运行时提示no such plot: "Totals"% A1 g6 u5 f4 W+ f+ a5 p4 W
error while observer running SET-CURRENT-PLOT
. j1 p- q3 u0 @$ W- I called by procedure DO-PLOTS* h3 r) o3 p0 J
called by procedure SETUP; p" r: O# M- m6 T* o. d
called by 按钮 'setup'
8 ^3 Z& g' l) [6 b求大神解答啊 |