我编的程序如下turtles-own [energy]+ r6 F/ _5 z$ f$ z
to setup
; D1 `7 ]) s6 n, S; o# L" P9 ^# b3 R' P" x( E clear-all6 _8 ~ y. j9 w! q
setup-patches$ f3 c6 X5 g2 j& ?" |- B+ y8 O- d
create-turtles 100% u9 j s( [! X' y" u
do-plots. H' z2 ]; n8 N% T
ask turtles [ setxy random-xcor random-ycor ]& L1 l) N" L& K2 ^; J0 R- U
end/ ~! T& ^) I% G! K2 p% e# T- ~
to go
; O& N" `7 v" B: E0 ^% x. z move-turtles
0 `( G/ E. Q9 C* W: f eat-grass
2 Z: U$ b8 @6 W reproduce+ L$ ]1 P1 H/ V
check-death
3 s' ~/ f2 H( Y* t regrow-grass
9 J' x2 C2 D! R% x ?+ S$ M6 ^' p do-plots
* y6 W6 @+ y2 p1 X/ \) q. Rend
. p' t8 y0 N5 S) cto move-turtles
E. V0 P9 \5 ^! p2 {( b- O" i ask turtles [
5 F" H5 `3 u% x5 @- Q5 m right random 360, \9 O: O5 x; ^) X
forward 13 O3 ~" `% u0 X$ K+ d+ n* |
set energy energy - 1
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* ^' s/ M1 j7 A) jend
+ k1 e1 n# H, [& C; i) C5 s* Kto setup-patches
- U9 k: F* `- A( i$ Y2 }4 K/ t4 i ask patches [ set pcolor green ]
% ?! R' a2 h0 [# |( R* X W) lend+ W' R+ b( w7 V" f7 X0 D, w% F: ?( o! i
to setup-turtles2 ?" A0 `( ^9 @5 F; Z0 }
create-turtles 100/ J3 X5 I# H" {. k, m8 R+ Y- m
ask turtles [ setxy random-xcor random-ycor ]# v7 K0 e/ f# f( X' J& O
end6 D2 `! O& o/ M3 r7 \. [9 t* L1 U
to eat-grass
- u) S3 b* w( n7 K6 c, i# k9 S" ~% j' c ask turtles [; b" r% e6 u( n! @
if pcolor = green [
+ z7 C' D2 b. {9 x0 G set pcolor black* e4 t9 Z" X0 N. n ~% }. p+ x
set energy (energy + 10)
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ifelse show-energy?
# Y$ v" ~+ B, p/ a& l [ set label energy ]) Q: a$ [; X- c$ N+ o) V: {- p' ^
[ set label "" ]
D! [7 b; y" Y# X# v! E0 X ]
" r5 Y, F% e' Bend
' v9 f1 Y1 R% Z% r9 s; Y$ q- B. d Y& uto reproduce
9 A) F3 r9 d' h% f' c+ V ask turtles [$ Z4 Q0 v) u0 P0 l$ @% O
if energy > 50 [
: v% i+ B* T* r( M set energy energy - 50
" `) q G2 Y+ J4 g5 h hatch 1 [ set energy 50 ]
6 s: U3 d# H0 k) T ]/ X. ]4 s) @4 `# l3 d7 p
]1 Y4 C% i8 r3 d# t) R1 N7 u: i5 S
end
% H, p2 s$ u* Q# n1 G# S7 @to check-death
) X. C" u+ o. o4 q1 \ ask turtles [
9 e4 | J- @' M6 I; e if energy <= 0 [ die ]
( n/ p6 k; h& t1 W8 R# p( W1 T/ B/ p ]
6 @, q3 H# ]2 a+ h+ u$ ^end9 O) R! e7 w/ W) L0 j& [) Q
to regrow-grass
' `. Y6 ^' n8 T9 Y; k' @( W4 n, [ ask patches [
3 F0 t% Q% Q# b1 _ if random 100 < 3 [ set pcolor green ] `7 Z& i4 z- n$ D
]
0 j: \ n* O# C. b4 ~3 cend
. I( t# x+ e' k' t2 h% |to do-plots5 D0 |5 w; }% \2 u. v$ ^3 L; D4 u
set-current-plot "Totals"- s: I% K- T' u: k+ n& G
set-current-plot-pen "turtles"
% n3 z, P- o L plot count turtles
/ o5 y; k& U4 n9 n7 _ set-current-plot-pen "grass"
3 d/ e8 d3 D5 [' K- H- w S3 z8 H7 R plot count patches with [pcolor = green]
! ^$ \5 L. x5 Jend
+ \+ R8 m) ^* y: y( k可是运行时提示no such plot: "Totals"
8 i+ \. D- i+ |* n+ |error while observer running SET-CURRENT-PLOT. c$ y/ L( l" l7 K, B, V# p
called by procedure DO-PLOTS- ?$ v; V7 l7 E, a& V2 s
called by procedure SETUP# @% u3 _ Q; ?+ u: \) z& Z: s: n
called by 按钮 'setup'
1 V& C4 G- ?8 o2 ~1 _, v- [$ W求大神解答啊 |