我编的程序如下turtles-own [energy]! _4 [+ e' S5 S$ Y0 a
to setup; B% ?% F8 \, V+ q0 Z( a& [
clear-all3 k0 H) L3 F. x: J
setup-patches7 P! m# m9 Q& b3 E# j
create-turtles 100$ `. ~0 {$ Z/ P1 ]( ]: L
do-plots
+ q# g5 k% @3 ], I) Z) q% P ask turtles [ setxy random-xcor random-ycor ]6 l# Y' l7 _3 m# q7 l, i
end: z; ^: l( v3 ^ u1 K( t! Z; _
to go
* b5 x/ C* ~3 e3 H4 I! C move-turtles
; U& J; r8 i$ d eat-grass
K1 V s3 k: Q$ Z0 A. A reproduce
( d- j% t- C0 o3 F$ {" L check-death
( S1 }/ V3 ]3 T- X regrow-grass
) M" |0 \$ r7 Z, N1 X do-plots
. ]6 r1 L R! S! Vend
. `# j2 s. t: }0 |( E0 |, zto move-turtles# |6 m5 [& e( d6 B, r$ L
ask turtles [5 ?1 h4 y4 C8 Q6 ?6 ^, @1 D
right random 360
; t0 C/ J* U0 N! S" b forward 1
- ]$ Y: C1 x6 }! N set energy energy - 1% \6 m. ~' ?" J. \
]; I$ e6 P; d, G d
end
/ M, t8 Q. e! n. X' B$ W# L% p2 dto setup-patches8 U7 [% p8 x9 B# X6 u
ask patches [ set pcolor green ]
" y' q6 A( S( I# g. Y; N* Z' N8 o& R, Qend
P8 ]9 D, s1 y1 I4 `to setup-turtles
) E7 Z0 q" N) w! U create-turtles 1002 S0 e& y: N+ V0 p6 ~% O& \
ask turtles [ setxy random-xcor random-ycor ]
# e0 b( A6 ?6 aend6 ~$ O1 \5 b. g. ?, X6 Y+ A' Z
to eat-grass; U; {& r5 T7 V' ?
ask turtles [
4 I: X0 z: I% w if pcolor = green [
" V2 s& a% L+ b* q set pcolor black
1 c6 D# @3 S n; J set energy (energy + 10)
* W: z, u: l* e ]
2 A4 Y, U( P$ M/ G# w ifelse show-energy?0 d$ y7 g. M6 [) _4 X2 [
[ set label energy ]
" U0 m* H1 [& }4 _! D% t4 O( X% z [ set label "" ]
9 T* m* p4 {) ~) ~# ]: K4 u ]
~) ~, R) ?2 ^' H- A" s) [# e8 B0 b, Z* Cend* a& f' I) o5 s1 K: M7 J* k
to reproduce i( m" K8 ~- G
ask turtles [
6 |- e/ s k$ K if energy > 50 [! y2 \+ Y- a* U8 Z2 l4 Q( F6 P8 e$ ?
set energy energy - 50
% x2 z0 w, S Q% w! S$ O& G$ h hatch 1 [ set energy 50 ]
6 j8 X7 ]; S: Q3 ^6 u ]% o- m' }5 ]2 g# s
]( r0 e. Y$ p/ _( A& D0 k' x/ \- W
end, v, ~7 g: `+ v8 ?' O$ e' l l4 y! l
to check-death# ~6 t/ z" J; K4 T. T! v" z6 V
ask turtles [$ q. G) j: V+ U! a+ ^3 n
if energy <= 0 [ die ]5 n+ W, A0 z- o- t$ ^" J
]
" p! G" ^/ E" L5 G' ]end% ]9 G# e( N. M7 \4 G0 o5 V
to regrow-grass2 O# S8 ~$ x4 Z- v
ask patches [6 ]* V8 _4 ]3 Y: \
if random 100 < 3 [ set pcolor green ]' o& y4 f! F1 | W2 r# t
]
( C1 K3 k( x: n+ h; `- w+ O/ U- Aend) | B9 C; ?" o) o$ h
to do-plots0 s3 e8 U% C( F% E4 H$ G
set-current-plot "Totals"4 U* [# S4 N: o0 a- A4 _- e
set-current-plot-pen "turtles"1 {1 `+ v: D1 j1 i. H
plot count turtles4 M5 Y/ |3 s4 [7 [# _6 g ~
set-current-plot-pen "grass"
* i6 T4 X) X" W+ b; A: S+ H plot count patches with [pcolor = green]% S0 b: f( u% y$ \5 r7 V. r
end
% O7 U" I! q, ~: B可是运行时提示no such plot: "Totals"& U& `+ J6 [- Z# e) A
error while observer running SET-CURRENT-PLOT
8 G" o, G% h, ^; S called by procedure DO-PLOTS; a3 l3 k3 |4 p" w6 p; M0 y" r
called by procedure SETUP
( ?6 m6 T7 z y called by 按钮 'setup'1 Z+ E. J' A1 F" u3 X) L
求大神解答啊 |