我编的程序如下turtles-own [energy]
1 d4 K: E8 v& R1 O; Xto setup! i2 R/ n$ i' u* E( T6 l7 C1 q
clear-all
5 c2 Z% G2 t$ j# a* w6 V0 O% U setup-patches3 w+ @! p5 L. b( D5 c- O: m8 i" g
create-turtles 1006 @) p: k/ F' c* Q- k4 m3 a
do-plots0 r, C; ^' d9 b2 ~: h j
ask turtles [ setxy random-xcor random-ycor ]! j! F. L& e5 [% @3 A
end
+ q- d, y* _0 oto go
p6 F$ J) R0 B* F; i3 a6 S1 q move-turtles7 k! E, D- ~. k- k1 Q* y
eat-grass
! F& g, c& N& }/ d0 c% N' w- Q reproduce
) J3 \" P( X6 [1 |6 u: Q6 j' U check-death! c: W& O4 l' f' f- _3 ~" j
regrow-grass# I+ |+ q+ z( r$ k. R6 w: U
do-plots
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to move-turtles C+ F: p2 }+ K! k; G& } r
ask turtles [6 ^9 a; N& x2 ?. F; ~
right random 360# M0 B. e, ?% ~$ Z* R% K
forward 1
; E5 d, I" y. U0 W set energy energy - 1
1 b* a) v) q- X ]
4 i" B; [' u# N/ K- R& i1 Xend: ]) h v; t8 a" ~/ j
to setup-patches' v2 C1 A& p; L( Q
ask patches [ set pcolor green ]& ~0 N" `, {. P$ P3 I( ^2 _; p T* k
end
8 u1 \9 }" t) W0 u, |# fto setup-turtles0 R5 [6 |0 y1 R. F* r8 ?
create-turtles 100' e8 B$ w( S9 [6 ^% H! B* }: B
ask turtles [ setxy random-xcor random-ycor ]& s$ V) ]( M& C3 U3 u) |+ ]/ d
end T, p& j1 g# d, H/ J" o
to eat-grass4 z& k4 b! w$ Q' A
ask turtles [6 Z5 \' K% z6 b- r' B
if pcolor = green [
7 V. y" `& T! ^' @2 i/ ?5 U$ o set pcolor black* o5 L7 M7 i1 z) W
set energy (energy + 10). y2 j4 x, [& i- ^7 f
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ifelse show-energy?7 I' y. T: f0 q" v+ {: t: q6 X# x
[ set label energy ]# @% C# V9 U6 a1 w6 P+ ~
[ set label "" ]
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, \. K9 _# J% h2 K9 ~! W, eend
; w- O. z' T3 i- Uto reproduce' S( R: E2 N0 G+ E1 W( N# ^
ask turtles [
8 F/ v) q5 X8 r; S. j( t8 v; q if energy > 50 [
4 r+ |4 i9 ?, V6 I set energy energy - 50; G8 T8 m9 U) U+ I- m
hatch 1 [ set energy 50 ]
u8 g- O: y9 } ]8 e' H6 T( s9 m8 ]2 q
]
1 }, N" p, N* [3 o- i+ ` tend
9 Q! t. g$ }( ]) hto check-death* j' E+ }8 y* Z9 Z6 W- `+ X6 P+ d
ask turtles [. y0 K- w! J' t) o) e( j9 W# U2 M) E
if energy <= 0 [ die ]
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end! E" }. o z i& B/ M6 ^* [
to regrow-grass
( Z j" n' A7 Y& B i ask patches [
3 u! c' s0 {/ u5 T* S% o: A if random 100 < 3 [ set pcolor green ]
[9 y8 {- h; ?' {3 y" ?) L ]
: t1 |3 k# v/ M; U! k2 }0 M7 r2 Rend9 ~" g1 ? D/ b3 j, I8 _- h" K& C \ j
to do-plots$ i+ t$ K/ Z) b# D ~
set-current-plot "Totals"
+ i h! m% C, y2 H! R$ n! |0 ] set-current-plot-pen "turtles"
6 Z. E* c& G8 F/ H, B6 M( T plot count turtles8 y' A! ~: V, z
set-current-plot-pen "grass"0 v s' t, }! e
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"
6 T; C/ [6 V- yerror while observer running SET-CURRENT-PLOT
F2 ]! q* |% o% v& n* h called by procedure DO-PLOTS4 C! C9 ~/ g/ |# i% ~
called by procedure SETUP
1 t2 G% M5 U x called by 按钮 'setup') A: @; Z' P! q6 }' X ?) k8 F
求大神解答啊 |