我编的程序如下turtles-own [energy]) x9 v. N; h1 f
to setup- W; j$ u, b+ r; W+ Z; p
clear-all/ B( E9 |" {- n! m4 O
setup-patches
O% V# ~2 W4 ]. l9 H6 g create-turtles 1001 Z2 g# d6 N/ B+ }$ x# t
do-plots `' u. h r; j1 U; k: u
ask turtles [ setxy random-xcor random-ycor ]8 B( c. I; s; O" {7 Z
end' N4 s. M; l" o
to go
1 p8 z- o$ ~3 d* h# O+ Y move-turtles
( \1 Z* O p4 @" R2 q eat-grass
5 Z, l" S* L" _' Q reproduce
! v- ? m& T8 {: [. J; u* n check-death
! T" q- u8 B/ F; Q! N' k regrow-grass
$ m8 h; j& \( j; R do-plots* E! O) W0 x! x; j
end; b: s0 p: }" c) e) c. [, k
to move-turtles
( y* [3 `2 r+ X/ i6 y ask turtles [
; n9 [1 A/ X" h; { right random 360
, |. b7 m2 k4 P* V5 F% ?2 i forward 1
2 d* h( `* ]( Z: ~ set energy energy - 1. N& y# j' j; t6 d1 Q/ D1 J& ^
]- ]1 _3 G# w, l5 l( _' l
end* z+ Z1 V- \( `9 A& r
to setup-patches. f0 |0 Y4 \6 N/ H* H
ask patches [ set pcolor green ]
3 M. Z3 f9 R+ D3 }) _end" G% {2 {# Z. o) A& D3 g+ U
to setup-turtles
5 q+ s9 g! y6 h9 K1 L create-turtles 100 b9 M U. I. C8 w0 J; W
ask turtles [ setxy random-xcor random-ycor ]& ^/ Q0 U: _( i$ S0 D* R
end8 O( j8 }- O8 K J/ l, x9 @
to eat-grass+ K3 A4 x; I# M7 V$ Y: i4 {
ask turtles [
/ \3 c4 n- u g. ~# {7 ]5 b if pcolor = green [* S1 m- P- g1 X1 c* @7 P& k
set pcolor black
: n- m" H: C8 T3 E set energy (energy + 10)
( C) t) ? z J& S# _7 ]0 X ]
: ?. ]& m' H, V1 w. G# [8 c ifelse show-energy?
1 u* z1 R+ _8 J8 p" V; d [ set label energy ]0 o9 m/ Z4 d, n( k, O) u
[ set label "" ]
0 V3 ?) n4 s- O- ~$ K+ x ]
8 w$ A: M$ j5 u; S# o* gend
/ ]. G1 Q% y- _to reproduce
: W. n( Z v B" z0 Z @' \ ask turtles [
* P+ J/ L9 p* \& \ if energy > 50 [
* r( q5 w$ y, t* Z6 E }) | set energy energy - 507 u: r0 v$ ?- B
hatch 1 [ set energy 50 ], i X( i7 }5 N6 ], m& t$ N
]$ W& _! Q$ b7 }& M
]* I; ?5 z# A0 q3 q# \
end
1 e( \7 i4 J& z; Sto check-death/ B1 S* i2 Z' K- D/ c/ D+ ~; ]# o
ask turtles [; x2 U% g$ P/ E; N0 d0 V9 Z6 M& l
if energy <= 0 [ die ]+ N: j% D( p& p/ _1 F
]
( ?* D8 k/ v6 C7 {* E6 |3 z2 Mend
0 i( g5 y/ ~* G& [to regrow-grass$ i* L5 W$ j0 f# a2 i& p6 u
ask patches [- `/ w2 @! s2 @
if random 100 < 3 [ set pcolor green ]0 \+ T* n t; E$ W
]) e; Y/ E/ O* v: O3 c" z7 V
end9 O' _1 d% [/ u* J+ P6 u
to do-plots
) x" f5 U& E# j) F5 e set-current-plot "Totals"
# H) R4 O* A3 m set-current-plot-pen "turtles". ^% J. Y( V2 t6 m
plot count turtles4 V6 {3 y ?# y8 Z6 a& O
set-current-plot-pen "grass"6 U6 U4 C: ]$ H8 o) Z+ ]: ?
plot count patches with [pcolor = green]
1 p! K, E7 y3 Hend
% f7 Y1 y# V6 } J! S可是运行时提示no such plot: "Totals"# Y9 d7 D) u9 E( u) E
error while observer running SET-CURRENT-PLOT7 M9 E) Z6 s0 N4 S5 {9 J
called by procedure DO-PLOTS3 a' \0 I+ J' n, j& u; m: Q
called by procedure SETUP& t' _+ k9 W/ `, a( M5 D- w
called by 按钮 'setup'! C/ g6 i4 r$ t3 X) G4 ?2 T
求大神解答啊 |