我编的程序如下turtles-own [energy]
3 k5 S* w3 b3 _# A4 k/ K& fto setup
* s b9 w* ?4 [+ u clear-all/ E! g' q8 j# l4 u" B
setup-patches
5 m, F( P8 _0 Z7 p, g4 h create-turtles 100
% i' o$ i" L0 N3 v4 d1 V8 T do-plots
, } d- d5 @3 ~7 F' g! b+ q ask turtles [ setxy random-xcor random-ycor ]
' Q5 v3 O+ a. V4 vend, T" |. ` T1 ~$ \
to go. V' U" I1 ]. a2 u
move-turtles+ I3 y8 ~8 c5 }) T
eat-grass, I( k$ P9 Q5 I8 Y5 x. O
reproduce
4 Y! K/ Q0 h4 ~ check-death
( O. _* c5 _7 A. x regrow-grass0 V* K+ K/ x. q# b7 o
do-plots
4 p I3 [% o- x$ N0 _1 @% gend
: E0 B3 w& s( _8 Lto move-turtles
( e! [1 J. l Z+ E, H$ a5 i ask turtles [" z3 G# `3 p$ n+ q! h
right random 360
" e; s5 ^/ Q! O! n& W% T forward 1( V1 f3 G; T' p9 ^% J
set energy energy - 19 E" L' V5 r1 c8 z% Y
]
6 A/ c. |: _% l4 l/ eend& t4 E8 n9 q% Q: W. X2 X- S) d9 n
to setup-patches- j V- ~8 c u6 K
ask patches [ set pcolor green ]
3 j3 d& W( b- C% ` m! Vend
6 P/ f: t# T! K, L4 Ato setup-turtles
+ {& e, ]8 `$ Y3 W create-turtles 1005 t6 X' j/ R1 ^2 I4 ^' C
ask turtles [ setxy random-xcor random-ycor ]3 V/ B" [$ R! q- w( {0 o# ]0 G
end
5 h/ X: A" z0 l3 R+ f! P9 v# Bto eat-grass
+ U1 {1 u6 k1 Y ask turtles [
1 i% z" c+ S& t; k' r if pcolor = green [
6 Z+ ] {3 q' `4 Y7 b1 b set pcolor black
3 @$ m! U' w2 U2 L5 W/ P# {4 R set energy (energy + 10)
u- R) m- v, A R) C ]" y. Y1 i5 p0 R9 S( ~1 Q
ifelse show-energy?% k* Q5 t# t( w* M
[ set label energy ]
2 g" b$ q3 P4 Z+ Q4 K [ set label "" ]
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v& a: ]3 c$ G+ r4 Eend$ u7 }. W d' `# [5 M! j
to reproduce5 o! q& w1 `/ R, j# h9 ]& G7 m
ask turtles [
+ N$ _* U+ }8 K1 l if energy > 50 [
2 G' H0 {/ k0 m* h0 P' i set energy energy - 50; P. \3 o3 Z; l8 e7 q
hatch 1 [ set energy 50 ]/ _' ?+ O& @2 z
]% p8 \" Q" C; J& `
]
0 C" v* z8 J& `$ x; Q( U6 Qend
2 h; N& `% O- k$ Z0 M2 H4 @to check-death3 m' G% Z5 E8 Y
ask turtles [$ _9 y1 X2 v& \& u
if energy <= 0 [ die ], {+ S& V0 L) s+ y
]$ e$ m) L- C& c! u; s7 z( U `
end9 A6 T. p/ d; b- I) S( [9 K0 G5 F
to regrow-grass
4 _& a0 m R5 \ ask patches [0 o$ D# x* f! y) E
if random 100 < 3 [ set pcolor green ]7 [# v, F. G! g' X& @6 C/ P& y
]5 R* u R+ i1 M
end
; y! z+ @) i3 l0 |to do-plots
+ S2 B u3 w; }% F set-current-plot "Totals". {8 A- V5 l5 |' t. k
set-current-plot-pen "turtles"
7 d/ H; ]2 R+ m, |5 K2 W8 O plot count turtles
}9 C( R" n- T; y @' n set-current-plot-pen "grass"
# [8 v- x( X( v- B2 j plot count patches with [pcolor = green]
$ e( E) h/ v. {, aend+ v( s" V; P7 z% T$ t) U- U& P- `
可是运行时提示no such plot: "Totals"6 S) U3 h; M- A9 ] \
error while observer running SET-CURRENT-PLOT
2 [1 U: @ I+ V1 A4 I) ]% M/ _ called by procedure DO-PLOTS( M0 J1 c( ?: x2 G0 K
called by procedure SETUP
7 p) o- t: S& A6 r0 X2 t4 [ called by 按钮 'setup'* G; E) T5 ?8 y5 O$ j
求大神解答啊 |