我编的程序如下turtles-own [energy]7 ~/ V/ y+ [: \" Z* @- G
to setup
( Q8 W+ k& g6 \1 d2 T clear-all* u$ C }+ U- q8 N# }' J( e
setup-patches; A# H! @* c4 O
create-turtles 1006 H8 i/ g1 h% l) j1 u
do-plots' G0 [! q5 T1 B- _: x0 M7 R$ c
ask turtles [ setxy random-xcor random-ycor ]
" i) C4 s# J9 [% v& r" qend1 O- J7 k7 H ~' {* I
to go1 l% g# g5 k! t+ e) d5 ]
move-turtles/ J- f6 S, X0 W3 C' `* V6 [
eat-grass3 X+ ]0 p6 [9 G5 z1 G. `
reproduce
- I. n3 a' H' ?* I1 u! E check-death
' {3 x( t. B% I* y/ G; V regrow-grass! L d1 P4 j* e7 k% u: l3 d
do-plots0 i, G. F1 q+ i m& u. I0 p3 n: }1 p
end$ Q: H0 s# \3 ?! u1 l% S$ k' @
to move-turtles: h. { M) }! M# h. e
ask turtles [' l, I8 N4 q; V: u1 Q- b) `/ c) d5 G
right random 3607 S! X* \, N0 e Y3 W
forward 1
0 I6 ^) U$ o. {8 E* d# |3 c2 m set energy energy - 16 t0 X1 U: ^2 m8 Z4 }" \" V7 l
]7 K4 z1 f# E+ X2 V
end
. q6 C4 ~, T s1 t4 [8 fto setup-patches
7 R Y% T; s6 ], H9 |3 l ask patches [ set pcolor green ] R5 g4 k& k, }% A6 i9 v8 I2 I
end
. N6 i. @- o4 a8 ^6 gto setup-turtles
8 M3 R# } S1 `0 F7 D% e create-turtles 100
/ s9 q# k9 ]6 w" B ask turtles [ setxy random-xcor random-ycor ], f2 H2 x* A% U$ h% N# b, ?
end
7 L6 _8 I* [ X' H ^2 E: oto eat-grass# p1 B1 J4 w+ d' Q& |
ask turtles [
$ {# G4 X$ g$ ?4 P) b* B% u2 i5 W if pcolor = green [4 T& d6 Y3 t( j& |1 p' l; D
set pcolor black
V: T& r, ^$ H* S% } set energy (energy + 10)# c0 `& |9 G" P: N: W0 S( x! W& n
]
& A* ^) T$ D4 H" S& B+ h ifelse show-energy?, w( }3 @+ f6 v, z
[ set label energy ]3 T8 {7 s) y! w* u5 q
[ set label "" ]
$ s. z _* O/ b1 \5 [- h; G ]6 E/ J2 E4 q" c( f4 P& p
end
" b0 I& k# E# M% i4 \2 Xto reproduce4 `; q3 t, ?: s4 j! u% j8 d% r$ F
ask turtles [. b( F X% ?5 z- _
if energy > 50 [, L) ?7 c- u4 R, l; x& b8 z5 x
set energy energy - 50) D! ~% F! q9 _- w+ T5 M% `! l
hatch 1 [ set energy 50 ]
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]+ y- m) J& N/ W" G
end5 E6 V: ?6 I2 w" |/ w0 i
to check-death
9 }0 S7 t8 m' k- q6 Z0 U ask turtles [7 u/ L0 g4 S5 v* B
if energy <= 0 [ die ] l+ X9 a) P9 ]+ p4 b
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end/ ^& y: H& \$ p! _
to regrow-grass
2 D$ S' Z, B5 F/ [: y# ]) b/ y% [ ask patches [
/ ]; v" _/ h# U1 z" r" E; ?! E" I0 \- y if random 100 < 3 [ set pcolor green ]3 E' B) ]6 U! ]) h6 B- L n" C
]
7 m4 k9 c( y" h+ H1 @end
! |5 Y' h% y' F7 `8 Sto do-plots; X8 C0 I' P% \$ M3 `
set-current-plot "Totals"* C! i' Q0 k* G/ t2 B* c
set-current-plot-pen "turtles"/ T$ M, g* [! t8 n
plot count turtles
4 F# m( l' M* h0 x8 E set-current-plot-pen "grass"3 r: f8 a, e5 A* `7 C2 z
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
! f4 g5 e+ J! I" a, G, y) `error while observer running SET-CURRENT-PLOT0 j6 K5 w5 x7 E: L( K
called by procedure DO-PLOTS
" H' H4 x+ u. R' d called by procedure SETUP) F" e" g/ A# D: T) e
called by 按钮 'setup'
, S. T1 v- t) |4 c) U6 Z5 B9 X: T求大神解答啊 |