我编的程序如下turtles-own [energy]$ q0 R7 I/ O# I& `( w# u9 U
to setup
" U3 k5 G4 @0 x0 T clear-all+ I2 V/ q4 p2 b$ p* w
setup-patches4 X8 o$ J! `% [( A* d; T( ^5 d
create-turtles 1001 S6 I( _1 j' y2 F6 b
do-plots8 E% f; W. u4 _" H1 l
ask turtles [ setxy random-xcor random-ycor ]
+ Z1 J' n0 \0 l$ Y" yend
1 P- H. J, S' ~to go
& s' p' T& ]8 _ e/ l* g move-turtles' P/ ^. B+ I# G5 \
eat-grass8 M1 d7 A! C( f+ b4 A
reproduce
5 l2 l) v. L# V! g* p check-death
+ l2 [7 Z3 {* \! f/ j4 i, g regrow-grass! B/ X7 U9 x1 L5 P+ j: n
do-plots
& k$ j/ }' S' R* \; send# |% A: b5 a9 u9 L- U' r4 y
to move-turtles6 i, q/ ^( N' z' b( g8 W, k
ask turtles [
2 i( x* B0 {$ Y# c. T, m" l right random 360* w& b9 F8 }$ l! ^) @% e+ ~
forward 1
& f( {. F+ [1 {2 v( z5 } set energy energy - 12 L' u7 r* F Y3 c' e8 ~
]
3 r: `* f) j) ^- T3 ?0 d0 yend
( p9 j8 m* @6 b- F& [! wto setup-patches
( j6 R, @2 s- n- ?4 T3 h( @ ask patches [ set pcolor green ]
% W- R- H2 j W, yend9 }8 b9 J- b8 h! q
to setup-turtles
( s: ^) x/ U3 U+ T4 T create-turtles 1007 m6 e& R' Z% F" Z
ask turtles [ setxy random-xcor random-ycor ]9 \( W' V7 P& S9 a" p' M4 c9 G
end5 s+ Y5 U4 t% T
to eat-grass" D& ^6 O5 C- \' w2 W0 u" u3 ^. M, L
ask turtles [
# L' h# p( M/ Z; f; }7 O C- I if pcolor = green [6 O8 E! h: @& z3 r8 U7 k3 B
set pcolor black
' O# S( ~ ? y set energy (energy + 10)* N8 _- ^3 M6 Y" h9 k
]9 V. B, w2 k5 w, [: j* @. T
ifelse show-energy?$ y* A; M$ R( o) C
[ set label energy ] n; L1 {0 J r" B1 I, S; `! m
[ set label "" ] T4 y2 m% |7 s! C7 J7 p
]- j5 i3 E6 X. E2 E
end9 L0 [) v$ K1 g" `3 U
to reproduce
- l4 W5 i. n. z( c) Q ask turtles [4 L, q& S) @9 R. e: [! k) B6 G
if energy > 50 [5 X9 R& p; w9 K$ Q. o0 w
set energy energy - 50; m& H6 M5 M7 Q' C
hatch 1 [ set energy 50 ]
1 L8 v: z; Y/ L7 X ]4 k! A& s/ ^" a
]8 T/ H, R2 h: t/ N) k2 F
end( K, L5 a! u( Q9 s0 k( W
to check-death4 I% k! n# }* n2 G
ask turtles [
+ p4 g! I: R) {1 y- ~ if energy <= 0 [ die ]
, d- S8 e% t% o0 e8 d" h ]
7 ?: V6 j- ?1 r! aend; T! V+ h% U2 g8 k5 G$ f4 k
to regrow-grass
% S0 I9 y4 W/ L' t4 { ask patches [
8 d" T4 }. u# ~ if random 100 < 3 [ set pcolor green ]
% `4 o$ Y6 _4 Q8 c/ q; y ]# y& `" D& j0 y
end! f7 X8 h1 ?( G5 h' O! K. t
to do-plots$ i: ]2 i+ S9 e' O9 Y1 v
set-current-plot "Totals"4 k6 T* N2 }) h+ m1 x! o2 p" _
set-current-plot-pen "turtles") W/ h( {5 H, z$ L: o' o
plot count turtles
0 ]+ w3 H8 T! m- S* f( m0 \ set-current-plot-pen "grass", b9 a7 ]5 o3 ?2 E5 j% z/ g
plot count patches with [pcolor = green]
' J9 p8 J3 z @end
) o3 w( h# N# v; ~可是运行时提示no such plot: "Totals"# Z, |, Y- Z: U% s1 @" d
error while observer running SET-CURRENT-PLOT
2 E/ {2 {3 W* }$ Q& S7 e called by procedure DO-PLOTS' P) D( \7 U$ R: E% D1 V* m$ k
called by procedure SETUP/ y5 i( o5 {; J- i' S8 e1 J' Q( n. D
called by 按钮 'setup'6 H% H. y' o f$ T8 j+ z6 V8 V
求大神解答啊 |