我编的程序如下turtles-own [energy]0 u1 R+ l; s7 Z- V
to setup
& h9 Z" Q( `# N' M% x6 j9 U clear-all4 g, B t7 V7 O$ @. ]4 o5 f
setup-patches2 a& p; g% f2 G& t' C7 U
create-turtles 100
$ S' F* ?) b7 { do-plots
7 Y4 G1 i( U1 {, A# [1 B9 i ask turtles [ setxy random-xcor random-ycor ]
- c# Z/ F. h) j" w% ~end. Z& Z" F; _1 X/ W& u+ J1 J
to go
+ x" H: o* l* O3 U2 A move-turtles
) Q) @- h* ~' r, W. V; G1 i" { eat-grass' q% e0 ~0 s( e# p. a/ ^
reproduce
' e" y8 k' ]/ U0 Z+ h4 d& C check-death
& h9 z/ F; s, R regrow-grass
7 y$ M: ~# C! r# g7 ] do-plots1 R3 C0 G& S" |5 P
end
/ _6 L' j3 X" G) h( V6 ]( I, T5 Yto move-turtles
7 B, m4 G# d, c, s1 R( D7 h ask turtles [
2 @: h$ C* \+ @- ` right random 360% Y6 @% D/ C$ g; }( j9 C9 t+ b3 F5 z( p4 c
forward 1- ]% \2 [3 d' `9 b$ J
set energy energy - 1
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end
& t9 [2 f' `3 A M0 Jto setup-patches
; g2 x: T5 ~* j) q9 C" _! Y+ [+ @ ask patches [ set pcolor green ]
" b4 k6 e, s1 r5 r) j' vend; q% j$ [9 ?5 v1 W* ]9 Z
to setup-turtles
( ~$ r$ ]# j* p& s' \/ B0 f create-turtles 100
; T M6 n1 P! `+ l$ D, T; }# v ask turtles [ setxy random-xcor random-ycor ]( A- \) _; d! u+ ^
end6 n& ^7 { x7 c' n; _2 `
to eat-grass
2 u$ |* A6 V) v5 Q ask turtles [7 ~ W1 y. a$ ^/ ?6 j4 [- U
if pcolor = green [
# @# V1 o# X9 p$ p! T6 S! G7 H set pcolor black3 ^) N9 ^ S8 c# r. Z G" Z: W
set energy (energy + 10)
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9 A6 ~2 w" Z) B( K ifelse show-energy?8 ]) h$ \% p/ Y! ? C @8 _
[ set label energy ]/ d0 q0 m' ?, U' L0 Z
[ set label "" ]
) C6 B0 l( W4 M. Q3 X ]
1 f5 R3 ?8 o& I9 J; b# ?# L# fend. j7 }3 N! J; X" l9 n/ B
to reproduce! M: B2 }( ^& o* V, c* Z
ask turtles [
3 X- E7 Y/ d9 t if energy > 50 [4 p% {6 C" U: x, l
set energy energy - 50
* o5 A0 _6 T. |' F- t* R% P; j hatch 1 [ set energy 50 ]/ d( z$ V: o7 [0 z! O. _$ ~" ~
]
& h! [: J: E; S( @: w j3 Y ]& e! L! r4 n- M% s7 L6 Y/ Z5 k Z$ @
end1 U9 z+ H2 ^% ]7 @. U; B
to check-death
& ~2 n, C( {: O9 \1 G" T, D1 c ask turtles [
+ p' S7 x. Y7 g7 x0 E/ I e- { if energy <= 0 [ die ]
0 b( \ ~) B# N- y( p8 P7 P ]
1 ]* _$ X" M8 k l& \3 Mend
4 v! M z+ K; q. eto regrow-grass8 A" a% T/ \- Z8 o9 J* m/ t# h: i4 L
ask patches [# p5 P% S l$ s2 i, n: J- v/ s; R
if random 100 < 3 [ set pcolor green ]
% D" P" H: ]2 t ]
7 l: ?3 ~. j8 \1 b0 y3 yend
% q" ~1 D: T2 D" T% P- Tto do-plots
) ~+ ?( O& ~6 f, I- b5 u( G set-current-plot "Totals"
* x0 d0 z" c# B3 f set-current-plot-pen "turtles"
; m( |( w) M6 b) G. i' _: q6 l plot count turtles
1 L8 L9 K; q9 h, A; Q" g( A set-current-plot-pen "grass"% s7 n2 j2 s: W4 w+ i+ O4 O
plot count patches with [pcolor = green]
# c& f4 ]* ^" r2 t' [* ^- I5 ~end
2 c0 J- W1 y7 f+ \可是运行时提示no such plot: "Totals"7 ?( f' P+ z0 s# N
error while observer running SET-CURRENT-PLOT' s( n2 G( r9 }1 C, w% {( N
called by procedure DO-PLOTS2 Y" k; B3 h7 D. ^% R. G& C& h) ]
called by procedure SETUP3 G; l( Q$ x, i8 E8 F
called by 按钮 'setup'
9 F5 t# B/ n% X& A/ g求大神解答啊 |