我编的程序如下turtles-own [energy]
* p3 {2 \; T( p# b! ?to setup
+ H/ k7 D. e& l# Z; z+ y clear-all
+ E4 W/ S+ D$ Y1 k G! H* Z) ]8 d setup-patches
$ S5 u: ^' m! b0 o. E create-turtles 100' \8 `, T7 p1 r/ a, i) W
do-plots9 g* T6 x2 s: K/ h
ask turtles [ setxy random-xcor random-ycor ]# @: p M0 j+ G& @
end
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move-turtles
- m- ]8 @" b0 u& u. B eat-grass
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check-death' R& l7 }' O; O: X$ t* D4 {
regrow-grass
! _/ V, o8 f' t7 H" { do-plots
9 C B" \3 Q# @: `. U, wend k6 R8 V6 `' I, T% n+ o/ t
to move-turtles
" ?2 M g k" M ask turtles [+ x8 |' J% U4 Z- d& @/ Y$ x
right random 360
' J4 V' ?/ r- A! W* [ forward 1
, q3 H0 \9 Y& v a. a/ v set energy energy - 1
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7 p( M) x9 n: r1 N- \. ~end
; a: Y5 [$ o% @ h; Q3 b4 E, q1 Pto setup-patches9 g( d9 b/ U! @
ask patches [ set pcolor green ]0 A7 h. v* f$ P! g: _, @- m+ Q
end1 I- u8 T7 v I+ G/ V- S( r
to setup-turtles/ i3 X( U3 _ @6 q
create-turtles 100! D* q3 W, A8 k5 l% Y
ask turtles [ setxy random-xcor random-ycor ]
+ F" S/ w" u7 T9 Pend. Y% Z, z" p) C
to eat-grass; ~' b; ?( X% W# m$ Z
ask turtles [1 H' y [2 U; @4 q9 |+ O( d$ G
if pcolor = green [+ y& d1 @* i B) Z# f' k3 H
set pcolor black" y) Z {+ K5 C( T q0 h
set energy (energy + 10)
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x' ^# K# l8 N ?+ b* b ifelse show-energy?
% d+ @$ ?3 ]& Q- x3 H' y; p [ set label energy ]
/ _( ]8 Z- L4 Y0 B' v [ set label "" ]
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; ]! p/ n/ [0 {: h, u a1 P& xend. z0 j+ }" Y/ @$ Q" `# r
to reproduce
# [) |' g+ b/ f5 Z5 M) d- k ask turtles [
+ ^5 {3 Q4 r$ ^ if energy > 50 [7 B6 k" T! H1 T2 V3 W
set energy energy - 501 T7 l* y8 Q; ^2 O& h; E
hatch 1 [ set energy 50 ]% S/ y: l7 H s# H C4 i' Q7 Q
]
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to check-death
% w" B9 U! X2 z- d' [ ask turtles [
. v" p) n- j) K% B5 t if energy <= 0 [ die ]
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end
$ A& v% \6 n/ k7 Uto regrow-grass
' t4 n9 K& H4 S& o M [ ask patches [
" O: t5 n7 W; C# }. J* e if random 100 < 3 [ set pcolor green ]: E( E4 m% {+ d1 F/ b" ~5 @
]. D3 m0 v( P8 Q
end3 Z9 R" ~ @( J' R- Q
to do-plots1 W, i2 ], i- Q0 y1 W3 x) K
set-current-plot "Totals"
# ]) |- f* x1 J set-current-plot-pen "turtles". G( e3 z7 M# W/ h
plot count turtles
4 U0 y' Q& \, p set-current-plot-pen "grass") u: j1 U$ h7 n* |
plot count patches with [pcolor = green]/ H+ Y5 P4 D1 g( K+ X! R
end
0 H8 X9 M2 H& D' S% R可是运行时提示no such plot: "Totals"' M" A3 y9 b( F
error while observer running SET-CURRENT-PLOT
; Y. u$ S9 _$ P( m$ M called by procedure DO-PLOTS6 Z2 R5 P; F" ^/ w z8 y
called by procedure SETUP
5 t4 n) r, ]5 h( q& L& s% T called by 按钮 'setup'
+ W5 D# {1 s! b求大神解答啊 |