我编的程序如下turtles-own [energy]
' c; q; \8 r5 V; G: r$ \to setup
) \. p6 ^* |7 X( v clear-all$ x$ T; k4 n+ O, z7 \
setup-patches. Z0 |$ R1 ?8 \
create-turtles 1009 s# Z! a/ m# T! b% ?0 B
do-plots
/ x1 }8 O5 O- x, x ask turtles [ setxy random-xcor random-ycor ]
3 ?; [! c1 c! x& _" Oend0 T% J9 h( M$ L. N
to go
; ^" O5 m8 I; H move-turtles
h/ o9 j O6 b) M O eat-grass
' |$ Y3 {$ f; I# w' N' l reproduce$ q5 [; W3 T$ U8 ]# A) [
check-death2 r$ k3 ~: `1 i3 Y
regrow-grass
- S' }" M) q4 W( O do-plots
6 b" l$ {4 z4 v, ]& V& K" H# _end6 O2 \8 K" _( u& K& F
to move-turtles
; J) w' }9 _2 i c1 X* x ask turtles [) a( e' n J y
right random 360
! s1 `/ A2 {+ o2 a! { forward 1( A7 U3 s5 {3 x* d
set energy energy - 1
, W7 g: O4 @3 k+ g4 f, J ]' @2 T9 k) n3 u. S2 k
end8 w: Q7 n- O( e* C
to setup-patches
/ B; u! ~: t4 O$ `& d D! T! C ask patches [ set pcolor green ]
+ |# o0 f( s3 V. g5 f: M+ V1 Oend
# J9 z8 Z' ]& t# P* O3 Kto setup-turtles
" C$ o; ]- s# \1 c# P" R! j create-turtles 100
0 e- |* S: [' s/ [' H ask turtles [ setxy random-xcor random-ycor ]
/ d5 L- }# v( p0 h, n& Jend
3 M* }% Q7 \0 j6 t9 i, l3 }to eat-grass
$ d" l% f$ L% P ask turtles [7 Q5 x( `% z7 Z! a" G% G6 q# V
if pcolor = green [
" o: ^: q+ t9 _0 q F* x* @1 B set pcolor black0 H% A& j5 D) O- i. w, }" l
set energy (energy + 10), C( L; k8 z% w0 I
]1 _) G. Q2 T3 x5 f" e" b$ Q$ Z
ifelse show-energy?1 Y3 S; e4 E- a. b1 b2 H; b8 B
[ set label energy ]9 I/ H& ?8 i# E; i* Y# z7 p
[ set label "" ]
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end6 [) T- r& \) u* p+ ]
to reproduce
% I, n& A" G9 B" j9 s% _ ask turtles [
+ P! Q) l. D" x) m% @9 \ if energy > 50 [; Z% V/ g- k/ c2 t
set energy energy - 50" R! Y' h% _' ^; t$ g
hatch 1 [ set energy 50 ]
0 Y7 z6 N. m. Z1 h ]! C8 g$ v# f0 e4 G! ?: g. U9 @
]
% w+ ^% a2 F, v+ E, u4 lend# e0 E4 w% o) e3 _
to check-death
6 P4 d7 a* \% r, J8 } ask turtles [
3 @2 u3 l& H w8 l0 H if energy <= 0 [ die ]
8 n/ S+ o8 R; R! z1 S. E, _ ]
8 s3 Z8 s& K7 k/ xend" E, E7 u! ?! x2 b
to regrow-grass
# f" D: }% i4 i6 ?- v ask patches [: _) M W- h3 l( i+ B$ ^2 w4 u
if random 100 < 3 [ set pcolor green ]: h5 ]( _5 B2 b) F) H
]
+ k. c, E# F5 E' aend2 C. u$ j, |* k4 q1 d6 ^/ I6 G
to do-plots/ [- Z4 y3 l) G3 c6 p
set-current-plot "Totals" Q5 U) U) Q! r
set-current-plot-pen "turtles". @6 ]* W8 {: L% r3 v+ L
plot count turtles6 f; A/ q! s" h) k; n# X
set-current-plot-pen "grass"
/ @% Y7 B9 X K l, {* g plot count patches with [pcolor = green]% B' ~0 @) q- r6 S" u
end- d/ `$ n3 u4 V7 l( H( K. S
可是运行时提示no such plot: "Totals"" S/ P6 b" i8 Z8 A; I
error while observer running SET-CURRENT-PLOT
& p8 k. \* x+ @ called by procedure DO-PLOTS
& h I) C6 z( w3 g called by procedure SETUP
# a" n) p5 R- T$ Z called by 按钮 'setup'
2 o, E# P) e% d& r' \: j( O求大神解答啊 |