我编的程序如下turtles-own [energy]6 }9 O: X) k9 F* d: x5 ]/ w
to setup
6 U8 P3 |/ h7 Z+ H clear-all+ {& m9 Z% ?* t# B! Z6 D* [
setup-patches7 M ?5 K$ m3 E( C& E) r3 r* u
create-turtles 100+ _7 q6 G0 j( x9 Q
do-plots: N7 _: r0 }( l6 V+ z
ask turtles [ setxy random-xcor random-ycor ]
3 Z8 I( g: V4 e+ D7 cend8 ]2 D# v# u! ?
to go7 X. n# Y6 }( T. g$ R' q# e7 ^' }
move-turtles
+ d/ t& l0 m# G: w eat-grass
+ |/ X& k8 ^: S! F* ~) L4 ` reproduce
4 T5 `5 i6 x! |* t9 X check-death
5 @6 X" ?* C% C! u- O) T regrow-grass
% ? X; O* F( O do-plots2 R7 {: |1 z1 `2 g
end* U7 d, ~6 }# \ k7 y U4 L
to move-turtles# q2 ]3 q( a6 c0 F$ h
ask turtles [
8 p6 t1 i: Z" X* T- W% r right random 360
; |0 i3 [. C+ y) n# @8 m/ _1 ^7 x forward 1
5 a$ \) G, I; E* o( ^7 s" K set energy energy - 1 u6 L6 M* X1 h8 J& Z
]7 I# i% E4 Z" f; V5 h9 N
end
+ L2 T, g4 k6 B0 M7 @, X3 jto setup-patches
: T$ a; [% O6 ` ask patches [ set pcolor green ]
1 I* i/ ~0 k) ?end
* V4 k, F- Y Jto setup-turtles
" f+ M6 T3 O9 F) o7 u) K r" N- ] create-turtles 100
* e5 `4 H& G9 [. n" A' e% y7 E( N ask turtles [ setxy random-xcor random-ycor ]) L' w" R$ q0 d, }- D8 }5 B
end
4 m: ~$ x8 a0 H1 m, G E( ^8 c# @, Cto eat-grass
4 T: n" m# d6 Z3 z/ t ask turtles [. [3 H+ g' @- _9 o1 u* j
if pcolor = green [
3 D7 [% y( B& P6 G$ s set pcolor black% E- j; R5 p& K: |
set energy (energy + 10). `6 S1 I; `1 r8 z4 _# S K" l
]
4 l! j8 H& ~- } ifelse show-energy?
: x: w; |# n. n) p. k* W2 ?( _ [ set label energy ]
& O$ S. k% C) n2 G [ set label "" ]
* h, h" a) i& T0 h6 _$ L! b8 n ]
6 e: v$ C3 k* E. Wend# n- X1 s& K0 y! _
to reproduce
* k* O) o8 j0 P) }( ~ ask turtles [" U Y$ j& M% \3 w# ~4 l( a
if energy > 50 [
3 ?+ R4 m7 i: m/ R6 t) P set energy energy - 50; y# P' }, Z' j6 \
hatch 1 [ set energy 50 ], k7 L6 y! w3 K$ v3 H
], B$ Q G7 L8 R0 R! r' O5 \ H
], D# r; m0 c* J: i& a) j& x( I9 e- S
end
* a( W5 D& z) o: T7 Wto check-death
7 N, R4 U5 e& O4 s8 t; A0 J ask turtles [# Z3 z- I# g/ o9 S E7 }
if energy <= 0 [ die ]0 ~8 s7 ~0 p6 K" b' B
]
: n& J2 b9 D& M, r; @end7 J- @ A; `! A: }- ~; f( r& G6 }
to regrow-grass
; K+ {: [1 @4 B' Z7 z' M ask patches [
" Z, _+ ?; i- e if random 100 < 3 [ set pcolor green ]
* E0 ^0 Y$ a) n2 X8 y, Y: {9 ~7 ` ]& V6 t1 `6 ~0 ^! z
end1 ~& E5 ^" N+ ]8 B# M+ p
to do-plots0 a( Y5 L' t6 ]3 ]
set-current-plot "Totals"
9 f5 q/ q: ~" j( E set-current-plot-pen "turtles"
) w' p$ p! p; c/ H9 I" E5 J. ? plot count turtles
5 M- O+ W" V& W set-current-plot-pen "grass"# r. y% V. |+ N; t! c! K
plot count patches with [pcolor = green]0 N+ i; X9 t2 o% I3 ?5 a' X( W
end
( b2 W1 @ G( `( w& }1 K可是运行时提示no such plot: "Totals"5 k% V+ C& u/ T! z9 v( {+ B) f
error while observer running SET-CURRENT-PLOT, ^( S" l+ `' y0 m8 J5 Q, P, {5 g
called by procedure DO-PLOTS
2 O2 ]$ B0 a' \' d4 m8 p called by procedure SETUP. v9 z4 ~+ Y4 H% c+ V% M' h
called by 按钮 'setup'
+ N3 [" f$ E* m1 }' f- q1 {求大神解答啊 |