我编的程序如下turtles-own [energy]
) o1 y' d/ Q4 }. ito setup& Y i' @# t0 s/ `
clear-all2 F! b4 n: ]7 e* S7 p
setup-patches
! j3 @ R O4 k create-turtles 100
/ r. z, b* X# G& \& X$ c& q do-plots
5 v% `& {% ?* y+ K ask turtles [ setxy random-xcor random-ycor ] Y" G- z* ~% ]
end6 H1 |- q. p8 l7 M; R, I' f/ M. U
to go
! ] Q/ y; _6 p4 ^ move-turtles. @7 K2 P! Y8 m5 L% N! c
eat-grass
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check-death7 w$ Y# I3 y q7 c: r/ q5 b0 H1 u G6 {
regrow-grass7 {6 z7 h! b v# M
do-plots
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to move-turtles
- E; H7 v+ ^$ j, v! l ask turtles [5 @& k) j+ _! W j
right random 360
2 e8 B: T$ |9 `" Z+ X forward 1/ l/ R6 q. l3 G' e' ]( L3 D; ]
set energy energy - 1
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end
3 S, z3 O2 D: [1 |* n1 gto setup-patches
$ w( { a6 ]/ X# q# k8 i ask patches [ set pcolor green ]9 m" P& T$ T' A
end
9 f: J% |8 j+ j, @" t# sto setup-turtles# |/ r1 H' t6 K3 T8 A
create-turtles 100# \9 y9 }5 P$ O# S) E/ A, ^
ask turtles [ setxy random-xcor random-ycor ]4 h/ ~1 }2 n' o0 @* G+ _' |! O
end( ~. V, \5 A4 B' S( X/ ~; B
to eat-grass# C: ?$ {8 b/ ]4 D2 O' t0 e, B' @
ask turtles [
# G$ M' H/ Y' H& ~" X7 l if pcolor = green [
# Y5 Z; e. A- {$ O set pcolor black
' ^5 V6 ]5 a# U+ X' ^ set energy (energy + 10)2 D6 C9 k7 r3 x3 u) e1 x
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ifelse show-energy?
1 S9 l$ c7 G7 B3 k# P9 @* W% d [ set label energy ]
9 Z t- H# Z& ^/ r" f$ B' x! Y, q [ set label "" ]6 D! a1 z& {* P. p
]1 N) S& h- G4 o- j. ]
end
$ w' O$ ?( ^) h n& p! ?# b2 o" qto reproduce3 M9 u. f. r b0 a; T! _6 B Z
ask turtles [4 X1 N( I% q7 y0 l, P2 b, @
if energy > 50 [
4 g8 u6 n4 N( `6 ]* A8 J7 e% \ set energy energy - 50
" N! }9 {9 E L% d% ? hatch 1 [ set energy 50 ]
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end
$ K2 I/ r% q; {% b/ J3 _" k5 l# ~to check-death
5 e/ N$ P1 L% ]1 u ask turtles [3 e; J5 C9 r% c r! B X
if energy <= 0 [ die ]
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N* Q4 e& {( i: wend
, Y4 ]4 ]$ r# ]. `3 ]" ^; qto regrow-grass2 r& b, I( D8 o- X6 S" D ?1 @, n" o
ask patches [, U" I* H8 Q5 \' F- B
if random 100 < 3 [ set pcolor green ]
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! ^3 A3 K+ D& Z% R( Mend
4 [" U# K8 }; b# u( M0 vto do-plots4 ^( b5 P' D+ k0 m/ ~# G
set-current-plot "Totals"
* ~# W) ?4 D- ]" | set-current-plot-pen "turtles"1 Q' Y4 V5 J6 K/ \) I
plot count turtles2 {; j- k9 I: {( D
set-current-plot-pen "grass"
/ Q1 k& ~ g6 p7 _; ~" E; O, [ plot count patches with [pcolor = green]; I5 V% y c+ ~0 G: E7 E/ B
end# O, x9 `; V* Q9 ]. j- v. r
可是运行时提示no such plot: "Totals"9 t$ y# O1 C" d5 c' O+ x
error while observer running SET-CURRENT-PLOT. ^, ^# J2 G' a/ o0 m
called by procedure DO-PLOTS
+ g" M# S& h+ m. L, ]$ f# X called by procedure SETUP
! s& @, r3 `, s% X, n P called by 按钮 'setup'7 v$ |4 L& V$ t6 w0 k
求大神解答啊 |