我编的程序如下turtles-own [energy]* W) ?( l$ F8 z# X' P+ W
to setup
' m1 b3 k7 U% k, R0 q clear-all
4 J6 S! r& ?7 C9 A1 J setup-patches: z9 A$ g" ~" G( f1 r
create-turtles 100
4 c, K# S8 Z r, h do-plots/ l' [1 S( Y' K
ask turtles [ setxy random-xcor random-ycor ]8 l1 {9 E2 H5 X. P9 v$ B
end. y& d, r& `. p- o) E1 a
to go
" N+ m0 b) w, x% A: p move-turtles9 Y* s0 |/ l, F; w: k' g
eat-grass
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check-death
/ a1 e$ Z) m/ Y/ }5 N$ s regrow-grass
! o( ^5 l9 M+ X) b+ V1 f5 B do-plots$ V( d( L/ L' k p! C
end
' ?6 s7 \; L! S3 _5 Rto move-turtles- M( R! o. h P7 }! {2 V; s- T$ O
ask turtles [8 k" X5 Y! j# x. E( @
right random 360
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* x% y# }, Q' } set energy energy - 1
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to setup-patches! h! Z$ N$ u) E& f; o- y
ask patches [ set pcolor green ]
5 J8 J3 h0 J1 ?* I/ W2 Aend \* _. C" ]: k+ f) |1 R \
to setup-turtles
+ w( a ]! R1 o2 J3 F2 [% T9 | create-turtles 100
% ]/ V& w% _) i ask turtles [ setxy random-xcor random-ycor ]* t. ~* J+ e) _
end4 b, ~& W6 L6 U- m0 @& d& ^, g( Z
to eat-grass
$ R5 r$ V, I z; ?3 v ask turtles [
. m7 W. ?4 e/ I4 Z7 ^, M+ `5 j0 K if pcolor = green [! A/ e( _1 {& v" f1 u
set pcolor black4 a, ]2 @% z5 S: |
set energy (energy + 10)7 y) P# Z1 K0 n! i) U
]
3 U9 m9 |5 s! f3 C$ F, G ifelse show-energy?- Q8 @: ?5 H: C
[ set label energy ]
( b( q% f- C, S5 u* `" r4 c [ set label "" ]/ j8 C* E) x0 p: O
]
! n4 O6 O. L7 \* ~end
: _/ P8 W2 [* ]% ~ n4 W% Ato reproduce
# y* A. \' j: P4 M% S' u) R ask turtles [- c, K4 a/ O" U; V2 R
if energy > 50 [
) p: O$ ~* ^, x) l: |- D8 I3 G set energy energy - 50
% [! y. m5 y* P hatch 1 [ set energy 50 ]0 j2 a" R9 q/ o# m3 h: r: |
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end
* ?6 q3 t) ^$ U; E3 \: Uto check-death% s) Y* Z+ s, S& `
ask turtles [; c4 r( O3 E* z* d5 ?
if energy <= 0 [ die ]
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$ o. B% o7 _0 t2 bend& H _: g5 P$ d( N& P0 v) l
to regrow-grass" x8 _4 j9 j# A) B D( s; S2 N
ask patches [# }7 }% ~* ~. [% F: s0 o; @$ z
if random 100 < 3 [ set pcolor green ]; O$ @' A9 {2 Y3 m, l
]
# W$ n: P% Q7 M$ a( p" K, |end
. p) \, k5 v: O+ r" t! o( S! pto do-plots7 n3 a0 Z- n. }" ^" ~
set-current-plot "Totals"6 C! ?. K4 p6 I6 v* D8 H4 ~
set-current-plot-pen "turtles"
& i1 w' b* I2 ? I+ L! l$ F. ] plot count turtles* V3 ~- F8 ?9 {; c/ f& M3 t1 L
set-current-plot-pen "grass"5 Y1 r& l# w) L6 p7 A8 g. |- c
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"! K$ h Q- E1 G. I% p- c0 J: G, ?# |
error while observer running SET-CURRENT-PLOT3 |8 B! X( Z5 ?- R9 I
called by procedure DO-PLOTS2 k: R' ^' N, _7 h) G$ |; ?
called by procedure SETUP4 q5 f- L& ?3 d: l
called by 按钮 'setup', P9 x5 ~: `" ~- X/ c4 Q; u& _
求大神解答啊 |