我编的程序如下turtles-own [energy]6 I* E% q3 f" I# [/ L/ r& P A
to setup% Z# s% b9 N& S
clear-all
$ V( ^7 U2 [; z9 g setup-patches
0 a {. M8 M' e2 W) L W create-turtles 100
6 p) w/ S/ N$ a! y" C do-plots
% C- E' o# D+ T9 N/ \9 L7 K ask turtles [ setxy random-xcor random-ycor ]% j( x+ N9 G& i# ~, U
end/ Z# u: B) |5 b1 K
to go% G6 E# h: @: T: o. Y
move-turtles
- v0 @5 D; {4 _, ` eat-grass9 Y( ?, E+ f4 w
reproduce& ?+ G8 t$ i& ~ _8 i
check-death: Y' z8 d& {: _( y" ]
regrow-grass3 r; M; o- L% ?& G8 w, b0 z8 [
do-plots/ o+ _) D6 X1 J! a# |9 _$ \
end. A& `8 | X- W3 x- _1 c( p- a
to move-turtles
: M/ [0 n. f, Z2 M9 {8 ~, i; c! N ask turtles [
\- f, Q2 H, \ right random 360
8 J2 A9 w, ?! I9 D) y forward 1
% P% {- K N/ g; G- y set energy energy - 1
6 l2 z( w1 L$ l- a. m ]3 U3 J( A8 u$ b8 f& E5 j( q6 s" C
end% Y- v7 T% Z0 h% d& ^* ]9 c# b
to setup-patches
& n. r8 i7 G% q1 d6 V ask patches [ set pcolor green ]
' P! t3 H6 N0 c7 Wend; X& j0 E0 ^* o+ [7 [+ O! `1 D* S
to setup-turtles0 j7 Q8 M+ M Y
create-turtles 100
$ [( @/ J1 _2 r$ t8 V- I0 ~ ask turtles [ setxy random-xcor random-ycor ]
+ c8 X1 L6 k9 x0 x, x) y2 Qend
) a5 z' b( A8 J+ l# k: Eto eat-grass0 u2 ~. M+ P6 v9 R: r
ask turtles [" g0 h; \3 |( d8 R7 z9 ^, s
if pcolor = green [- C, d& M8 E4 {3 c0 ]+ x2 ]# T
set pcolor black
. O" o. s9 `2 Q0 t' \ set energy (energy + 10)
$ {8 G% S4 N3 r% z# n6 }) c) {' | ]1 W" q/ o* d/ X0 F* z! j
ifelse show-energy?) R+ t& x+ Z. h/ e& A7 a- U
[ set label energy ]
( l9 }1 d. b5 ~; i [ set label "" ]
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end
. f' j( p. d1 C1 L& rto reproduce
1 }' B" |" P. x$ L1 }% o ask turtles [
% t( k& a3 `& }7 f if energy > 50 [
# R7 U8 ^. ?- F; n! h" x) |/ @ set energy energy - 50
" G4 ?; S" A6 ?4 W5 t( S! ] hatch 1 [ set energy 50 ]% I& H. ~% j7 {
]
( |, \$ o7 o, ^ ]
1 Y) ]9 h3 L5 W/ Dend
& p: |7 T5 O! x' M" m9 r( q/ [9 Vto check-death) M1 n* W8 W# W/ g0 d
ask turtles [
& A# Z% N& ?" m2 ?+ r7 o | if energy <= 0 [ die ]
! v& S+ [3 v4 g( t$ M x2 x9 { ]
, G# z9 b! Z+ P) j$ xend
4 |" f7 m& p# D L1 lto regrow-grass
) }7 } J$ F: Q. h- S. K: T9 u* @: { ask patches [5 z* e1 }5 P" I, ^' L
if random 100 < 3 [ set pcolor green ]
0 V" M. E Y4 ?8 D ]
4 j* U1 g. C/ h2 A$ K4 xend
% w% H' Z, [. l U5 r7 Qto do-plots/ S8 n' }9 B+ v" F A- b* X
set-current-plot "Totals"
* l ?/ h0 {1 s9 r$ l7 E/ K( k) W set-current-plot-pen "turtles"
: K# l; O2 I$ m plot count turtles
& M3 N+ O" t9 n5 H6 ~$ W0 t. o set-current-plot-pen "grass"
: H2 K) }) Q; d plot count patches with [pcolor = green]; I( ^" W/ U1 \; p
end
/ }5 n+ T f$ l# ?可是运行时提示no such plot: "Totals"1 A% u/ k* @; g: p4 d
error while observer running SET-CURRENT-PLOT8 W6 I) W/ i; p' B5 O: V! S
called by procedure DO-PLOTS
+ W5 |3 |- R2 R) A# V8 k called by procedure SETUP
$ L. ] y" h( g. u called by 按钮 'setup'* X7 P; r* z8 S! I0 D
求大神解答啊 |