我编的程序如下turtles-own [energy]% }; _$ L! M* w3 G- x: s9 @# e
to setup+ d" l( ^7 S/ d n& X
clear-all
; l3 P+ T0 Q7 {% D: C- o setup-patches+ ]1 K7 u& }; P" r
create-turtles 100
% {5 h7 I3 Z8 ^1 y/ @! L; C: d do-plots
9 d9 X! z; W: }( h: ^ Y2 | ask turtles [ setxy random-xcor random-ycor ]3 L% x0 ^) ?: a- V0 x! p: D
end t' [. W0 V3 N6 X. H2 f
to go7 c$ A! R) l2 Y- {9 R) ~
move-turtles
1 a3 L) T1 x- q7 s3 ~ eat-grass
' K( Z5 c5 K6 M+ j" A- b reproduce9 y# @* u2 k: k! s6 e" V5 U' ?
check-death; Y$ `" m* O/ H) a9 O9 B
regrow-grass
( p1 Q8 |9 J7 p# @) X4 P: z! ]4 N& U# G do-plots2 l' \- V+ s% j$ u* l
end
) A& X4 r+ v; K* r' Tto move-turtles( k b) D0 K1 I4 c2 p) @
ask turtles [0 o3 d6 B3 `! a/ X1 X6 P' x% z( t* @
right random 360
1 n: }: R3 @7 m: V forward 10 r% w7 ~5 Z# [& ^$ J" ^+ S+ G
set energy energy - 1
@3 z' R/ S) A5 a( p* \ ]
; N) p; x5 U6 W1 Fend
( A; c2 T& g, K4 z+ F& h3 t/ v, c/ g# ito setup-patches% I1 I% }; J% r
ask patches [ set pcolor green ]
+ |! E4 i, z& l6 J8 P0 Y E9 Wend) B' E9 q' ]! q3 Y5 D- A
to setup-turtles
5 E' m3 r* V1 H) T create-turtles 100% D+ C/ a: v. o8 F! n$ @5 t H
ask turtles [ setxy random-xcor random-ycor ]
& O$ V0 r0 v5 a# Z# O% Lend
$ D% x9 G; M- N9 u) eto eat-grass
5 H' o% B. |* I1 c( }# [ ask turtles [
0 o" p! ` m0 [; B6 B1 k6 f if pcolor = green [9 T6 l) C: q1 |. X
set pcolor black' X5 l& ?; G% l9 C" _
set energy (energy + 10)
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7 w* Y, z4 E+ E8 o$ y; b ifelse show-energy?* @7 t U7 [6 L/ k
[ set label energy ]8 B- s) t* S+ B" T. a7 o" p
[ set label "" ]. Y) Z; M! D `& X. g
]
: ~# K8 N/ E( \+ t' }end
7 a" w. u) E" Rto reproduce* h. ?8 M" t/ R) L% O
ask turtles [
! g3 F7 }6 u& v/ R+ V5 P- n if energy > 50 [, r0 f$ o7 @. _8 |; G+ ~# e" w
set energy energy - 50
+ q" n3 c1 h. u' E hatch 1 [ set energy 50 ]# A0 ~0 n& i# n8 P4 q7 ^3 @
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]
) s% p+ ~: k; |end; \7 b E" o* u9 h, E: \' X/ h7 }# r
to check-death, b. s' M* a. Y N, `# f0 y9 m
ask turtles [
7 ^! W& ]% I# i6 p" g& s0 [, e if energy <= 0 [ die ]) T: u* b! O# q8 ?- j* z1 ]5 c
]
* p7 p, g$ S1 ^, \end# j5 E1 v. r9 X4 e
to regrow-grass
( \! U7 O8 v" ]1 g& b2 ]3 z" U* |3 ~: l ask patches [/ }9 D% c: k# r2 S( v& ~1 H8 A U
if random 100 < 3 [ set pcolor green ]
6 E! z- }. Y7 S0 Z. S ]
9 U( F0 s: L. W$ C2 e- l" F7 K h/ nend
/ N8 H; D) T$ s# ]% n9 tto do-plots
4 P% d# j% K$ T set-current-plot "Totals"$ j9 B+ w+ M( J" X7 h
set-current-plot-pen "turtles"; q9 M1 s2 _- H0 V, {
plot count turtles0 j$ t, E& w( P2 W
set-current-plot-pen "grass" H+ N- A9 j/ ?* D1 S
plot count patches with [pcolor = green]
% w1 L* j$ }* `+ K$ Eend
* |% ]4 r" ?$ z- X( D, ]可是运行时提示no such plot: "Totals"
( M+ f# d$ C/ aerror while observer running SET-CURRENT-PLOT
, n' G, j6 F+ p7 Z called by procedure DO-PLOTS
! @9 i8 V1 ]/ T X5 M( x called by procedure SETUP
0 l, s, G. [7 P! L5 K3 i7 c6 s: I called by 按钮 'setup'
% K8 X4 M" u$ u2 v! V& n求大神解答啊 |