我编的程序如下turtles-own [energy]- N; _$ ?: w( W* d- B
to setup
& d) [0 h( Z( B. Z+ V3 r clear-all
s& B3 N" s* X+ W7 q' F setup-patches
: x ]# V/ W2 D: a create-turtles 1007 W* p) h& {- h" I1 K( B7 q
do-plots/ M8 ~* v' Z8 R
ask turtles [ setxy random-xcor random-ycor ]
) \1 ~) k& e( cend7 k8 m) G: h b7 j9 D) \3 c
to go8 ?$ i& y3 J" ?% Y
move-turtles
' k0 c8 I# B6 V Z+ U, i3 m( \ eat-grass+ k' i. y: N) _4 \ L# }) v
reproduce
0 ~( t9 W+ d, y check-death
4 k( O, E: O; q! R& o9 P+ M regrow-grass
/ O6 U. Q, N( O do-plots
S8 u9 c" f7 N: @, tend$ z) C% t4 Q, {( E! K
to move-turtles/ y& {5 L& V1 i1 s* a! t9 E
ask turtles [; l+ [+ @- D, ?
right random 360$ M+ J; N! Y. L5 w/ `
forward 1
5 N. d$ Z! U( O set energy energy - 1. S- U# S$ ]6 _" D3 Z& h B
]6 f0 c& D8 P t9 U. }% f
end
. R# E) K: I. J, M; X% Y1 uto setup-patches
; Q9 V; x4 _! b! P( M, j ask patches [ set pcolor green ]7 E( c5 l# M. Q* |
end8 ]. z. @+ f; x5 v% v+ n1 F+ B
to setup-turtles. ?3 b- j" V8 B8 ^$ {" l- G: Y( s" d- e
create-turtles 100
+ X1 ]1 b) @. F ask turtles [ setxy random-xcor random-ycor ]$ A4 T' R* g$ _4 k" B
end* b) a8 j: |1 i4 i0 t
to eat-grass& J: ^9 o; H8 h" I2 E
ask turtles [: o2 x! F) m- U% [8 w6 a# _
if pcolor = green [
. l5 c0 N; C1 @& g+ Z+ f0 P set pcolor black3 s* @ A O0 n' V6 ?
set energy (energy + 10)
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ifelse show-energy?
\- J3 ]9 c C [ set label energy ]
% t% ~5 ~# H' y9 H$ r3 { [ set label "" ] x q; a" S" z6 F
]9 {9 B& Y! t0 w7 H4 f" C% A, N
end
! J, ~( I, C k4 L/ {% ~6 lto reproduce
6 B% a- h- z" D I( l9 t ask turtles [
" V6 [. k3 f& C6 q, N if energy > 50 [
# e( |% k- j5 ?- A7 i0 F e set energy energy - 503 D0 U9 Y$ z: ~. a% |! u
hatch 1 [ set energy 50 ]
4 D( W8 e" @9 w: R8 c ]
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. ?, j2 K9 U( s' }3 @end8 q' J1 s/ w& {$ y
to check-death
- x: @4 e/ f% z$ b! y8 e7 K' b ask turtles [# W- I) N6 _5 X) J
if energy <= 0 [ die ]
/ q$ _5 r. r' Q2 W% u3 o4 K ]
9 S6 {0 C$ R+ e0 r8 ?end+ d+ B3 G' e: @" e
to regrow-grass
) D; _, i- v% L' G ask patches [+ H) r0 K; r$ _3 ~0 \3 e5 s; L3 n+ }
if random 100 < 3 [ set pcolor green ]( R6 I) ?2 Y- ]6 j
]/ t7 y# b, k: } [, n; g5 i' G
end0 U. y; {) b# J, ]/ s
to do-plots4 M, f- Q- _9 ~1 K, T s
set-current-plot "Totals"
. O2 c4 l6 y! X) s) C/ y, W set-current-plot-pen "turtles"
9 C7 N- h: c# X4 M plot count turtles
: F0 e4 v: g; ]7 ?+ T) q set-current-plot-pen "grass"7 F( C2 o2 |8 e0 V
plot count patches with [pcolor = green]* o* w- W/ a/ ]0 P. S8 h( {# l
end
% n) T0 B" l! \可是运行时提示no such plot: "Totals"
% c! p3 H& E+ G" y6 Y6 \* |& a3 a6 Xerror while observer running SET-CURRENT-PLOT: o) x! Y. Z8 Y% W2 q* ?3 U
called by procedure DO-PLOTS
, `$ Q2 H8 f6 }( X# | called by procedure SETUP
' Z h* Z+ x1 \- G! H+ M* N y called by 按钮 'setup'
\+ r; l q" I! X/ i4 [4 S求大神解答啊 |