我编的程序如下turtles-own [energy]. T; D* N! r9 N( V( b. G
to setup
f( |( k* Q [( o' _: s clear-all
5 d1 i4 A! W5 O' s4 o P1 W8 l& u) H8 K setup-patches. R0 m& ?, |0 r! ^! s' I& _' v
create-turtles 100
% w6 H! ~8 X! g: j do-plots8 W1 c! c$ v& a+ p% M
ask turtles [ setxy random-xcor random-ycor ]
4 q" `$ O# n8 V9 S9 Eend
3 ^/ K, }, N, U4 ^, s: \to go
0 F5 n0 u, v6 o. C* Q1 n) x( E move-turtles% J P" B) [. Z( X; w& j4 F
eat-grass
' f2 c6 w4 h! W( S5 A2 ^5 W reproduce
7 e; L" P0 `4 ?* r4 X check-death. K3 `1 g+ z& b! t# U4 X5 n! |
regrow-grass
3 o5 @7 P m. w* h8 m do-plots2 g$ ]5 g4 V& Q, P9 z
end
; i9 W6 Y5 ]* F! m) l+ T7 P$ Lto move-turtles
+ j5 I( o9 C: B/ M1 C% J3 ] ask turtles [; z0 i- h$ Y6 V& f$ [' L& h% R
right random 360
6 ~0 q, `' s. p% ` z4 y forward 1
/ B' I/ k) r% A: [, W7 R set energy energy - 11 R0 E( J, o9 z2 m
]% C/ n3 [: a6 }$ A4 z5 K2 [1 a
end' t% M% F6 X& q$ ]. K8 @
to setup-patches) h# l. U$ T9 B4 e2 |; b2 b
ask patches [ set pcolor green ]" m# |4 B6 M/ `2 F* f" ]* d! ?
end* G C( Y6 N# O. M
to setup-turtles6 S; \5 A6 @5 l1 n
create-turtles 100
3 A6 ^- C N2 J& Y$ ]. I% y ask turtles [ setxy random-xcor random-ycor ]
; `* M3 F8 J3 ^8 \end# X: P/ u- A1 K* A$ h' F
to eat-grass* M5 d/ z$ M% J: d* K2 P
ask turtles [
: m9 b* S/ i1 i& @2 M% a( t! q if pcolor = green [
( W+ g, @' J) \! K% h2 o set pcolor black
( W4 x! B8 C/ r* `. k0 i% R set energy (energy + 10). u/ n& J5 m, `; g5 V, h) z
]0 c9 l- d; ?0 o; r3 q% H, C
ifelse show-energy?
( l. m* U" O, e1 o: ?' D [ set label energy ]& c) j m. r1 Z
[ set label "" ], n& n4 B- S# o
]
. _+ b; x7 }8 r f( j3 x( Tend
( X5 u9 c$ B8 b; {* b4 I0 ?to reproduce& _. M5 e- Q; z1 p7 ^0 S6 x: U
ask turtles [
* o% j' Q' c1 D) _5 M* ? if energy > 50 [5 J" F: _- |! K" v) ]5 x0 J
set energy energy - 50
. ~0 N: S6 s1 |# b0 q hatch 1 [ set energy 50 ]0 r' Q6 c/ V3 f
]
2 v0 i9 ^. i2 O6 B" I/ |+ U* G! d/ J ]
i; g* r$ u7 V1 @- y/ I! xend
3 B1 q+ ^* d( s: h0 I2 L1 R4 `- \to check-death% W7 w+ y" {" L, W, h* A7 p, ?5 {8 U
ask turtles [% K+ G! d8 x: ^" D: x/ D1 ?
if energy <= 0 [ die ]
: F5 U; T( N" C* y4 u+ |2 P9 J ]# a$ A8 ~! B8 M
end( `6 m. F$ K! u0 P; o+ f- A; i7 n
to regrow-grass" c6 |3 P2 s7 [, g
ask patches [
5 O8 q% D' e$ U5 v5 g L7 m) r if random 100 < 3 [ set pcolor green ]) M: R2 d0 {' U" l: q* G* E
]
2 u$ s& {$ O" f0 Gend
- ^3 T6 H5 g( K5 I% _to do-plots
- _: @6 E) P4 X+ l1 K set-current-plot "Totals"
0 z( \1 V3 d* F- ~/ } p set-current-plot-pen "turtles", }+ x+ G3 }* Q6 Q" Q
plot count turtles7 q' v- w3 O; R" Q- ^. G
set-current-plot-pen "grass"
, ?& W, I+ m- |4 n& \* f plot count patches with [pcolor = green]
& w/ B# D2 d6 b; ]+ [end
! d3 T/ a) i9 B+ C5 Q可是运行时提示no such plot: "Totals"% j' e% G5 j$ W6 W0 Z
error while observer running SET-CURRENT-PLOT
, N, _0 R3 Q9 M called by procedure DO-PLOTS8 s4 C# t( T! E
called by procedure SETUP5 C# J$ ]( U! l% M# {8 g0 P
called by 按钮 'setup'3 b& V8 O: i& L# n& @6 C! k
求大神解答啊 |