我编的程序如下turtles-own [energy]8 a1 M% j$ h x; R# d& u
to setup
4 l1 N* }+ @7 {% u+ f/ L clear-all) B! q [* h3 y) N W
setup-patches
# @3 q; l. Z3 C/ u& W create-turtles 100
; h' L. Z$ t0 p6 h# S% `: o do-plots
" {/ G2 b1 w7 g4 E ask turtles [ setxy random-xcor random-ycor ]& S/ z- a( X* j. z
end
4 R* l, Z; D) L2 Ato go
" P' A* v6 R! V: Q6 q4 @ move-turtles. a% `8 o$ ]9 e- b
eat-grass( L7 W0 i3 I. y6 v% l9 v I7 R
reproduce/ p. I3 D7 X" a
check-death9 X! ?( l9 m) U# R
regrow-grass
9 d: E/ u( z( E, S* K do-plots
* i2 @& Q+ C( U# Z5 u) H( S( T: ~end; v! B5 l' W) O- C. A" `+ \- r
to move-turtles
) O* \% L5 _& Q/ x" q5 s ask turtles [
6 n' k |7 ]- F" \1 u& v; H* p right random 360) g' N5 Y5 i4 p$ ~) s
forward 1
9 f8 a- d9 X# ^/ n set energy energy - 1
, W7 B. g* P8 N+ F ]
0 ]- K$ _# R) Y7 dend
+ k6 U2 P1 D9 [ I& t0 Zto setup-patches" o9 p6 Z' B/ A6 E8 d& u
ask patches [ set pcolor green ], W7 ~7 _1 s% C" b# s
end
5 L) h6 e& I) z6 N! s% p- W9 Oto setup-turtles, s" I9 M$ _% K9 ]! Y+ }
create-turtles 100- n( d" M4 u2 s/ K$ o) ~
ask turtles [ setxy random-xcor random-ycor ]' ?8 Y6 ~: E' j: Q
end, ~- [: _1 Y) u: N/ E
to eat-grass2 i5 [8 B% r2 v
ask turtles [4 p1 C; h' y' Q+ G( L8 d+ t8 v5 o
if pcolor = green [
( y+ S# Y/ k \' O( U set pcolor black
6 x' @% q% r: N. r/ n3 o. K e" n set energy (energy + 10)
% M! {7 {0 y0 V ]
- ]) @; l9 j/ j* z7 M* w ifelse show-energy?
9 m* O5 L7 @' p$ [, u [ set label energy ]
& R9 V6 T4 }7 e( A1 S/ Z7 l [ set label "" ]
+ K1 }7 I4 o' O- C ]3 J G. \' j# D2 G1 m
end
3 s4 }& e' l/ ?9 ]: E( ]* x n" }. Ito reproduce9 c5 m; [' p) h" q; y
ask turtles [# t! X/ _9 e0 d0 W- I2 D3 [$ u% O0 S
if energy > 50 [
' F6 ~# z, O5 ^: ~" G" H set energy energy - 508 b8 ]' Y4 F3 Y4 \) N1 q
hatch 1 [ set energy 50 ]2 x6 l Q- r9 l
]
, A2 K( W5 B; `; G( r4 L ]
3 \+ N* C& c$ o4 v+ X& F: Wend
% }- m! a" m) e+ M/ ~- ^) d! `+ \ hto check-death* G4 Z8 Q4 b. |% W' d; o" z( o
ask turtles [4 U7 K* _3 L M2 z5 y1 ]
if energy <= 0 [ die ]
. ?3 y _- y/ A; `( g ]+ g& E7 L: H- ] p/ \
end
' c+ ]/ @' P6 y% B, r0 B3 L, q# Pto regrow-grass1 @5 P+ ?3 l/ B1 f# R! V& U1 U
ask patches [
: }. h2 H; j3 z. E I# N5 v+ m, q if random 100 < 3 [ set pcolor green ]( J ?( d- f1 H
]$ q/ Z- S+ d& [ j
end
$ }0 p5 g6 S6 B( c# X% ?to do-plots
; C& h0 R$ [$ }% c( U: s- a# x set-current-plot "Totals"9 u7 t0 g( T6 k' M3 T. M) w
set-current-plot-pen "turtles"& G6 y" U; _7 ^3 E: F2 c
plot count turtles- ~7 [( H. a; ~- l* v
set-current-plot-pen "grass"
/ H) T) m9 f' E1 g1 M plot count patches with [pcolor = green]
5 T: ?9 g& S0 z+ ` Eend
7 a& C2 b5 N6 i' ^. Z2 R! k& |可是运行时提示no such plot: "Totals"" e* H1 u2 M% L* W# z* q
error while observer running SET-CURRENT-PLOT
: k$ @: U2 L2 }7 P! L$ Y: |5 U; _ called by procedure DO-PLOTS( F8 b( s' l( A: Z: Q2 R
called by procedure SETUP
1 ~3 c" f0 S5 s9 T! o called by 按钮 'setup') |) c) G7 Q+ P$ R4 M
求大神解答啊 |