我编的程序如下turtles-own [energy]& ~' r. Q% Z9 p# X7 r% [- O( q# w
to setup
& q8 I3 _& Y) R1 K( Q& L0 ]" G clear-all2 J. k' c1 m" B6 S+ z6 O8 B: q
setup-patches( M% T( w; X$ T
create-turtles 100) P- M* I. ~: m$ A4 F8 g1 H8 G
do-plots
9 g5 P8 {* \% X+ h3 ] ask turtles [ setxy random-xcor random-ycor ]; k; y4 g* `! }" {9 n0 [ {
end
; c4 D8 [# J2 H+ v! [to go q. M, q" ~' j7 @3 n0 B% q. [" ?
move-turtles) e7 I9 V7 N! m
eat-grass
* O! v: ?+ [( S* b, X4 @# S reproduce
% c" @1 E3 W/ ~1 [! L check-death
6 S. [$ {% H* w5 e Z! w" D regrow-grass; j. ^: t1 x2 [' x, Z8 ^
do-plots- z) H6 s" U. u" Z. v
end1 B& @1 i1 d! S3 L
to move-turtles/ T# p% K& {, [& h3 i5 g" ~2 P* z
ask turtles [
" d9 v; N5 j+ ?: j& K( r1 V right random 360
2 X0 G) ^0 G4 e5 S$ f- n forward 1
T0 y$ d# `% Z' F" A& c set energy energy - 1
# g! G8 y3 u! E* U; |8 x ]
: B7 k: D" W# r( d# t0 Nend
7 N; J& X' y1 R0 Uto setup-patches) z; f" { W- f. i& C
ask patches [ set pcolor green ]5 k* J# y! H# U" _- l1 f
end e; s3 C; o4 C$ a: I
to setup-turtles
9 c5 ^* ?7 [7 _* y' B+ B$ k: l create-turtles 100
; ]: z4 Q, I. p+ S; w ask turtles [ setxy random-xcor random-ycor ]" v Y, L: {8 u4 x# }( Z
end
5 o9 @! ]6 ^5 A6 l1 Sto eat-grass! F; P8 B6 g2 p! m9 J
ask turtles [
$ l' U) X J B4 {. b2 H1 O if pcolor = green [* i% B0 }/ {# n) O+ h( i9 p
set pcolor black$ L. C( i0 [5 @
set energy (energy + 10)
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ifelse show-energy?9 I! [ v* n- ] ^' D0 Z
[ set label energy ]+ m. _, E! f# T) e8 t$ j
[ set label "" ]5 F, B0 h4 ^! D0 E- @% N
]; ?2 U5 F1 _$ D3 r9 `* H% o
end
o/ U! K# W1 f; ]$ D6 F4 \) Ito reproduce$ T. L! X/ n+ b7 g$ s5 W: V
ask turtles [
( p' Q2 E4 W* ]2 r if energy > 50 [5 ~+ Z$ {. S: r" p: l. i
set energy energy - 500 y& z9 [" Y" U9 l
hatch 1 [ set energy 50 ]
- E$ G- g+ c# J; @ ]
9 Z! Z k. F+ I ]
$ b0 M, ]* S4 n# M$ L+ [4 u, x- l/ Xend* }) x5 f; t; v8 h! E
to check-death, i# o# |9 a* w) ^
ask turtles [* x& E6 i/ h4 C7 Q1 l& I
if energy <= 0 [ die ]$ t5 k" w6 U$ I- w/ m' ~- b: q$ T
]+ }: }- ?; C% y) ?3 ~! G
end0 K3 D7 E) J6 o9 x
to regrow-grass# a* ]5 K& G$ o) m7 c
ask patches [
1 r: g, L8 g9 F2 D$ F" W4 ?8 X if random 100 < 3 [ set pcolor green ]# u7 h: }- i0 J1 } R$ e
]" A: E8 U, w! k/ k# y3 M+ p. r
end+ R) @/ i m/ P( {" ^3 K
to do-plots$ Z, ^+ f- Z0 ~
set-current-plot "Totals"
9 a2 C( x5 O [# e5 B* W0 A- B0 W set-current-plot-pen "turtles"5 y1 f8 q5 r6 x6 J
plot count turtles
9 O. x2 j' e# }' S2 ?4 ^8 U set-current-plot-pen "grass"
8 ] X7 \$ {/ q3 s9 \# C7 \ plot count patches with [pcolor = green]; I3 y& j2 u. E; D4 h2 U3 Z: n
end
, u h$ X0 g, b9 i# B0 n8 B可是运行时提示no such plot: "Totals"
3 B0 W3 X% e* |/ U' j+ ~8 Kerror while observer running SET-CURRENT-PLOT
# R, g7 ~- F9 j called by procedure DO-PLOTS" |/ V. l7 |( r g1 s( R
called by procedure SETUP% y, y# s, z2 F% v: m" \: h! {
called by 按钮 'setup'- R' j* t9 D& u5 Z) |: L
求大神解答啊 |