我编的程序如下turtles-own [energy]+ E# }: P6 ~3 x; D5 Z; n& i8 x
to setup( l" L0 c* @2 Q
clear-all
( f: l M1 ?; c3 F0 i+ X setup-patches
! J* A+ m2 P r2 f* ? create-turtles 100
2 k6 k. i: W" h O0 |# V% C( A6 ? do-plots
$ \% O' u$ V w `# l9 v6 t ask turtles [ setxy random-xcor random-ycor ]# g. A: P9 n4 k c* x
end, Z6 H' b4 Q4 z, v5 Y
to go/ L8 n. @3 f: M0 g1 d. y1 A
move-turtles
5 i4 t! @- r2 g! V$ f eat-grass
7 E# \5 T& D3 }/ F7 O1 e3 I$ D reproduce
* J! S+ _1 U( {) l" a% \ check-death$ c! S1 A: X" j* P+ G+ y5 ]' o& {
regrow-grass& ~% T1 R7 z- f
do-plots# }! C0 O0 J8 Q! j9 `; z! P
end/ z# v7 m# }" Y$ U8 t$ z' h! ?
to move-turtles
1 Q, \6 E" w7 L& h/ }3 Y" } ask turtles [
6 _# r; b% ^, j9 c- a right random 360/ c5 s( B% i3 T4 N
forward 1
9 P& e+ j) a1 {9 T- B t& T set energy energy - 13 E8 ]' l" n8 o2 ]7 l
]
4 h7 t+ j* x8 n2 e- aend
4 n8 k* J0 V* }6 q7 d) P+ kto setup-patches
$ O5 Y# t" ]6 _8 i2 e$ [, | ask patches [ set pcolor green ]
2 ?- t; j$ L, K5 _. aend
& X( N& h$ f6 T% @5 K( uto setup-turtles1 H0 O* D' c' H* |4 n
create-turtles 100
! g& \) u* Q+ D$ R& [ ask turtles [ setxy random-xcor random-ycor ]! a0 s& F- ~5 o1 B0 i9 G' }, ?# j t- U( S
end( G* }# ~. z0 ^% d8 _# b
to eat-grass$ Z4 R! U0 f% F$ j( c6 Z
ask turtles [( @* I; P# ?8 T2 \4 m# Q
if pcolor = green [
0 X4 W' R. M8 M) i set pcolor black R* q/ s: a( p" [: [
set energy (energy + 10)
% D; d* N& A" }; _; d ]$ I3 G' r D8 }& j7 U$ h
ifelse show-energy?, N3 b- ^4 I% E' }. m: ~9 x
[ set label energy ]
& U/ u' q& n Z+ y+ r: G" { [ set label "" ]( D! Z1 }! y& @* n1 g0 p# S+ ?
]
5 d5 h9 k+ R$ R: p( }end
( F2 r) k- \7 d$ C2 V2 ito reproduce( n- B7 m7 O9 N) [+ X
ask turtles [
" v9 C7 `; z5 `5 K2 V& g4 K if energy > 50 [/ X( Q7 i8 [: @$ r3 ^
set energy energy - 50 [, t+ g2 v$ Y& `8 g! A- u
hatch 1 [ set energy 50 ]
, e4 m4 U+ |( s, f: d* t& w ]! T, w5 _7 O5 D: t
] D5 e* K! y# g/ T7 A
end
! d0 B |" e0 ]% M, Mto check-death
* y" b3 a( |. r5 I ask turtles [
1 t2 S3 g7 l6 A- H& z if energy <= 0 [ die ]4 w6 c; D; n# G* X
]' K5 R) v, X4 v$ r4 l
end# R! d# y$ I# \. i
to regrow-grass( b4 |8 X9 G: l9 ^+ ?8 V8 w+ T
ask patches [
+ I* p1 T3 o( c if random 100 < 3 [ set pcolor green ]* V0 W& J9 ~3 I7 y! u/ u
]! T: s9 {7 W; }
end; v3 ~4 m1 ~: S& i5 b* q
to do-plots8 A+ t7 O7 |, j: F6 Y( L- }1 w9 U
set-current-plot "Totals"
' Y+ r% _6 V( `; t. G5 D1 Q set-current-plot-pen "turtles"( G; W# z+ i% k$ E- B
plot count turtles
; F0 q- D; B# _8 T- K5 ]4 } set-current-plot-pen "grass"% T0 j1 C1 N! I3 `' s9 `3 K' w
plot count patches with [pcolor = green]
) g6 q% H% ~0 H3 J9 Z, L( Mend3 d8 }; S7 k0 m0 P0 o( ?" E
可是运行时提示no such plot: "Totals"5 R0 P* _/ Y# |$ Y2 D
error while observer running SET-CURRENT-PLOT# E- ^* |9 g' z8 q3 Y( l7 d
called by procedure DO-PLOTS/ ~! X9 n3 s3 ^ _# A3 A' |& |7 n' l
called by procedure SETUP
. {) L2 m8 |9 ]3 L4 w+ [7 e/ `0 g called by 按钮 'setup'$ E+ z0 T3 @6 b# v" Z7 q
求大神解答啊 |