我编的程序如下turtles-own [energy]
6 e# B! k( M- L5 H( }( M4 ~3 Eto setup
* e( V. _- j: M clear-all
8 E8 H; K% N" n setup-patches' q4 u( R9 Q7 H9 y8 l# }
create-turtles 100
3 t6 i# ~ P' R$ n. P R6 C; } do-plots: h4 G% b" O4 T4 k
ask turtles [ setxy random-xcor random-ycor ], |7 I0 Q0 A3 M6 E( f
end+ V6 z; \% G5 K; `: |
to go
) J' U: Q- Y, t2 G move-turtles
! ], r4 ?3 x5 B3 s7 ? eat-grass. x4 G: A6 ~9 q0 J/ X2 M# Z
reproduce6 l4 j, F H9 T8 p9 w; A8 |
check-death' j: y, x* t$ _+ c3 E! T; D$ w% g
regrow-grass$ Z. o1 k3 A$ B% o6 V
do-plots
" n- I1 U" I0 X; W) _end) Q- e4 _, Y% K/ P' v0 O+ f
to move-turtles
. _1 ?& \8 C# d/ C ask turtles [' E/ K0 S7 N* }% w: {+ p
right random 360
1 {+ j ?# V- W, T forward 1
( `1 y7 s/ B5 \+ q( @! v! u set energy energy - 1
% y* C/ _ o2 q+ X ]
% Z1 A9 \& U: _+ A9 n, I( cend
/ K) o4 V' Y Zto setup-patches0 ]. i4 D) K& Z) z8 W3 q2 K. E
ask patches [ set pcolor green ], K, U, P7 t: k* l# u
end
2 V: s9 \3 ~$ \8 vto setup-turtles
- }; ?3 u+ U1 T8 O% p' }7 X create-turtles 100
9 a8 q7 E' s) m4 }& u8 Y5 B" y0 B0 P ask turtles [ setxy random-xcor random-ycor ]3 X3 X5 ~0 j* Y; _8 ~$ M
end# D' ^, O. P: i2 m6 k6 M; w& W, @
to eat-grass
T3 a) d3 |; m3 d; } ask turtles [. c. m$ j- d& \% `
if pcolor = green [+ Y2 ]: Z7 n. |( s7 z
set pcolor black0 m# |0 n( h7 }: M% ]# P' w2 T
set energy (energy + 10), a% a" W4 b4 Q
]$ Y! H" }- z6 o1 y. u% ^
ifelse show-energy?. [, {! m8 Y& @& F6 A: Z
[ set label energy ]
% R, H1 d+ ?1 D [ set label "" ]
8 \0 h7 L* ^: s% y ]
. ]6 e$ j4 T' _3 ~% [7 d6 A& o( Dend, P( `1 ^! E7 t! z, y1 R: g
to reproduce
& o' C9 V# o) v5 z' J: u7 ` ask turtles [) S4 H* s1 U! \, x! c: ?' R
if energy > 50 [
+ y! h# j; L" V set energy energy - 50
1 A8 `- B" d {% W( U hatch 1 [ set energy 50 ]
8 r- y8 \3 M$ Y, b ]
8 E: a6 {* X7 y: F- n0 e ]$ t- }" I4 p) ~9 t& g ~( B( C
end
/ K o: ^9 p' r! n: Y+ Zto check-death0 o: s3 X- A F; x* d
ask turtles [$ ~8 q2 d Q6 {2 z# Y
if energy <= 0 [ die ]. b( K* ~5 U8 o* a
]
7 `4 {9 ~0 m% H9 F& v# [* dend% V& E- _6 |! e+ L! P! D1 a* B
to regrow-grass
: @$ [( ~ w& O* X ask patches [7 D+ N W. y6 G
if random 100 < 3 [ set pcolor green ]3 m1 }" y. j) o0 v2 b) k" S
]
; E4 @: r% A, ~5 ]+ u3 ]3 send3 v A! B4 @2 q) H+ w- o& a' ]
to do-plots
2 `: ^3 o! O% U$ w set-current-plot "Totals"8 T7 M" ?6 D" k) c" o* ?5 U! d
set-current-plot-pen "turtles"$ U3 a% q2 |$ v4 T
plot count turtles
9 C' e( P9 }; ^; F- G. O9 _ set-current-plot-pen "grass"- i1 e$ U5 ~. |4 K; N0 k* r" ?
plot count patches with [pcolor = green]& W( W# b3 X- _4 w2 C/ S5 |
end" l! Z$ s+ l6 O
可是运行时提示no such plot: "Totals"% u' n0 |( R- I6 Q) C3 e- X. B
error while observer running SET-CURRENT-PLOT
5 j6 p- V* {6 D$ F+ F called by procedure DO-PLOTS4 l- g P$ C0 C0 P" \0 `. w+ ~1 |; j
called by procedure SETUP
9 O8 s- H- h& r4 i2 J called by 按钮 'setup'# k" t" R+ M( q$ F; P
求大神解答啊 |