我编的程序如下turtles-own [energy]
5 d) D5 b; g& l. B7 `! o8 ito setup5 ^4 y i" W; }
clear-all
; Q4 G6 i& Y8 [" p& o6 s! J$ ] setup-patches
0 |( k7 A. m8 n3 j& M' l1 ~ create-turtles 100- A! L2 ~% U: c2 _. b* z/ U5 o
do-plots" r$ W4 a8 U* K$ x5 y3 s0 y( m* A
ask turtles [ setxy random-xcor random-ycor ]
( O8 D9 n( _' S, W7 a9 uend
! a0 ~6 c3 I8 j5 G# G) u" [6 Rto go
' e* M8 \, K6 @4 T8 v move-turtles# |2 y1 r" i9 o# s: ~. W/ g) \
eat-grass
- [- l- ^. O9 h3 n4 a" a+ } reproduce
' m% o& Y9 K3 l$ S/ w check-death N& v; q O% j% s# S% O
regrow-grass
0 N' M6 }2 ~* c. d Z' \; R do-plots! {) H- b/ D9 b- V
end- V/ t2 ]/ H. T# w; z9 t4 I- C
to move-turtles0 p$ D6 `$ }1 T$ y' l( o/ r
ask turtles [' u7 L$ b, a; {1 D5 S* |1 B
right random 360
]1 [; F6 `5 h$ M# e forward 19 W& `0 G1 Y; U8 d% j
set energy energy - 1: r1 |0 D J) Z* T" d
]" q6 i+ ^, k. Y2 {1 b! I
end: c V; E% N' l) S: R8 q+ o1 C" v3 y
to setup-patches
+ k6 V9 h$ F) V; t ask patches [ set pcolor green ]( B/ Y m* w+ c* v1 b
end
# M7 ^% l! S* ]to setup-turtles5 t9 b9 n9 n4 W3 s% k3 _6 m
create-turtles 100# q; \% B T" t& C( P: m
ask turtles [ setxy random-xcor random-ycor ]: r' R& c3 q+ L
end
: O+ ]- s! t: \0 e Z |to eat-grass
: H+ I9 M4 e# |* s7 b( L+ z0 X ask turtles [
7 w& `; B9 Q+ p) t2 d if pcolor = green [( Q3 H1 I" K7 ~: t/ e
set pcolor black; y, |% C2 v( r, V* g
set energy (energy + 10)( a% E) v7 Q+ Z4 v5 U
]
1 G6 y" Z; M {. |- q0 ]) `% h ifelse show-energy?
3 g' u: H- e& p( q$ ]8 j9 v* { [ set label energy ]3 U a& v* X+ j( P
[ set label "" ]% M( c/ u h1 h! q) L. Y- H1 h- A
]* i0 C7 N. {& Z; U( e
end I2 Q$ [& J0 I* g
to reproduce
/ c$ C6 L0 I& ^ ask turtles [7 `! y. O3 B# x6 O6 o( R2 i7 j0 e
if energy > 50 [
& p) K; g7 L6 V1 Y" Z: m set energy energy - 503 `1 C2 W# c: ]- Q
hatch 1 [ set energy 50 ]
/ ?- W$ ~! h1 e( T& M6 G- ~! m ]# E7 D2 D S( u) z. W0 B ^9 E
]$ c- G7 c2 N1 F3 W
end
4 Z6 f5 t# c. r0 G K+ L: ?% ato check-death) k7 h+ u3 K5 B! z% @$ W H! t
ask turtles [
+ R# s1 D6 A4 t- t; o* @ if energy <= 0 [ die ]7 w3 n, o! P* ~
]# v6 f. Z" A+ n) f8 C/ k
end
" @9 G: q) z! `5 K/ |to regrow-grass
) m! i3 e; M3 Q4 [- c ask patches [
! }; y' D P7 w# } if random 100 < 3 [ set pcolor green ]
3 q* x. _& ]9 \* d# Q ]! o8 k, y' v9 z+ \$ K" l9 G
end
2 R/ K8 V2 n2 r$ p" \1 Y% Rto do-plots
6 A8 O* H: ?( a# U- l set-current-plot "Totals"& ]5 v. Y, j( }* R
set-current-plot-pen "turtles"
5 n+ p4 h+ Y( U3 h' S! C plot count turtles
, r& A s+ G2 \) f N1 O set-current-plot-pen "grass"
3 `0 \( |/ e+ ?" F0 n& K( F plot count patches with [pcolor = green]: {' ]4 T1 b' J. O7 M# _
end
' f2 f& Q9 c4 u9 Q4 P( \8 ^/ Y* P可是运行时提示no such plot: "Totals"1 \" ` `4 z2 X
error while observer running SET-CURRENT-PLOT: t5 R6 w4 x3 {7 T; W
called by procedure DO-PLOTS3 X- h, x0 ?. d- K" g+ G) V
called by procedure SETUP' X# f0 M/ A% I+ Y9 p
called by 按钮 'setup'
8 Y" V$ f2 E& ^求大神解答啊 |