我编的程序如下turtles-own [energy]5 l. j6 @7 w* E E x9 c
to setup
, j9 V, E. ~6 T% X5 ?5 A# H clear-all3 `0 O4 d& i- q; i9 n- h
setup-patches( r; D: G3 }& v N
create-turtles 100( Z3 W1 R U- s: K1 p
do-plots
, j. p( D0 G4 O7 N- F ask turtles [ setxy random-xcor random-ycor ]2 S6 J1 _$ Z" d, O5 ?, j" a
end+ @. i- Q0 A, k, c9 |7 x8 H
to go
; ] Y2 Y% y) w( P move-turtles
5 e- H/ g4 {" I) f) X eat-grass, p, ~+ C7 o0 y+ P5 r
reproduce
4 k9 ~% w1 u, f4 B$ d$ F check-death
; e9 X% y3 s* b' Y1 H, n: h regrow-grass4 b. f% Y: k. x: w" _) F" s, w7 E
do-plots! g3 {. M" m9 J; u
end! M; g% d3 Y$ R. ^0 D6 V
to move-turtles
( C9 f3 c' V% I+ G9 J ask turtles [0 e+ u6 Q \; g' l
right random 360
4 g. z8 G( j0 y' o forward 1; U8 C5 T$ M! V( S3 E5 S
set energy energy - 1
! x, }! W. O6 L2 N( P/ w. w: G% o( u ]1 A6 a7 n! {1 u& {+ I7 P
end
, u. k6 Q) _# {0 P9 J" L! l' H1 V- l0 `to setup-patches
! o1 r4 }$ n) Z+ L ask patches [ set pcolor green ]
4 b1 [- P5 l: }- Pend$ X: P* R' }7 i, W7 h0 ?
to setup-turtles; P8 G; i! a( L0 ` r$ o
create-turtles 100. ]8 h: \1 p, g% S! R0 ?! e
ask turtles [ setxy random-xcor random-ycor ]
}& x9 h, J5 |' x: o$ cend
& A$ l3 ], Q: \/ f& a7 ^to eat-grass
; w9 m& f, a* A# l, W ask turtles [0 `5 d% h# Q" T1 L$ W- c
if pcolor = green [, u$ d! B3 d9 ?' O) q) U
set pcolor black: F( ]; a8 u A" k
set energy (energy + 10)
9 V" c5 {9 D& ]: D/ ? d" q ]: `2 l2 D- ?7 X5 h% ~4 a! D6 d+ C, e/ \* K
ifelse show-energy?$ [' F+ z, ^. B: {3 x( a
[ set label energy ]
# q5 h/ j) ~1 O: | [ set label "" ]
4 A3 p' @& B$ J' N ]
$ [! z4 B- p# ^. E: Mend& {7 u6 \. I3 Q' a
to reproduce0 B8 S; {0 @4 U3 `, q* l6 _ y* i/ Y) t
ask turtles [7 A0 s; q. U! v8 Z7 I9 N9 D
if energy > 50 [1 R' z. y1 V) i4 e5 C: [6 F
set energy energy - 508 M$ \: N' I6 K: E! i
hatch 1 [ set energy 50 ]2 G- Y4 U9 t# ~" v* b1 R# ^
]2 R$ s; a. l( ?9 F* f$ l+ E( q
]9 q8 U6 I0 Y; v3 {( _) z
end
R: d; _4 K' I( Ato check-death4 ^% B& p' l- k# C# U+ L/ x7 M
ask turtles [: P1 e& a+ B* _# C6 w
if energy <= 0 [ die ]
1 G3 U3 k9 `9 L5 N* f" ~0 w ]
/ X1 b& E6 r* [end7 F* z9 f2 `" i; d+ c
to regrow-grass
; t& R0 s; {" i ask patches [1 S& U, J: P0 i6 C, h
if random 100 < 3 [ set pcolor green ]
, v, j8 q% g6 B J" F% H ]+ T0 {; u4 _: h5 X7 E0 n
end* {( t! k! O" p: C
to do-plots
0 u) G5 G+ q+ w1 X+ h4 T set-current-plot "Totals"
6 x6 a R- Q, |; i9 i set-current-plot-pen "turtles"1 k0 b& V/ x. q. V. O
plot count turtles1 G$ B A. ]/ h, b9 w- h, g: k
set-current-plot-pen "grass"0 ^0 d! E& l2 V b3 ~( g) S W
plot count patches with [pcolor = green]6 j+ v* w0 z( u# m, Z
end8 d4 e. h$ Y* K
可是运行时提示no such plot: "Totals"
+ j* h/ U* c" a. `! `/ Cerror while observer running SET-CURRENT-PLOT
2 w, G) h! H" q+ V3 N% c called by procedure DO-PLOTS- C; [7 @1 C: z& N0 D# H
called by procedure SETUP z' P; X% v% G, T
called by 按钮 'setup'# m8 \5 ?1 e! A8 e* {! s+ v
求大神解答啊 |