我编的程序如下turtles-own [energy]
1 ~+ E) i7 e/ s ?to setup
3 o% h1 k$ S# p" ]" D7 D3 ^ clear-all
* @( i' F* q( o( z! o setup-patches
! T% c. G2 D; c7 p5 J+ q create-turtles 100
" y0 g# e9 \! A' q M9 K! t do-plots6 |1 g, K4 Y K
ask turtles [ setxy random-xcor random-ycor ]
4 h. X. o6 c* E7 c+ Z, M+ Xend
: B, m! x4 P. ~to go$ \0 q7 ~9 W( A) n6 c
move-turtles1 ` R7 g5 `9 Y2 @. Y/ D# e* t
eat-grass
# w) i# ]& w( o6 k0 X0 q reproduce
9 N! |" ]- Q: W8 [" P check-death
. w# j5 e/ ^2 Z5 S regrow-grass& m p; D; C/ v; f( m
do-plots4 k8 E1 n5 w- h( ^
end1 m: D( p7 b& l$ b: y4 A/ p# l3 w
to move-turtles1 s0 R: U5 w3 j8 i0 I
ask turtles [
9 f( y* t7 X% j' C) @# D j right random 360
& H) G7 A" ^ C3 q4 t' x7 P forward 1: [! y7 B& ]0 v3 M8 j6 ?
set energy energy - 1
# s& y8 Y0 y# [6 e& O: g ]6 A$ w- ~' T" k
end$ U7 Q4 w) K8 q% G; b$ n, G% j
to setup-patches
" o* r t/ ~, C; B8 e" R ask patches [ set pcolor green ]1 _1 E6 a. @) z: M
end* w+ F) s0 }$ j/ K' s
to setup-turtles: j9 {' f4 N5 I% V
create-turtles 100* u$ Y& i# }( X' W. ^2 x3 w
ask turtles [ setxy random-xcor random-ycor ]
* b( t6 A( ` b* B2 Eend z4 A: q9 W, Y6 I) d: h3 B
to eat-grass( W: t( k& a+ v1 E7 D
ask turtles [2 b* y* b: \4 G5 K1 X( }
if pcolor = green [
6 P1 i1 a% D" G' I, d set pcolor black# C' y, t2 M' G6 t1 }0 d
set energy (energy + 10)8 A5 q( z( |+ l1 \; R
]
1 ?! m2 E, O" ~$ X% I ifelse show-energy?
" n; v$ A5 q( _) P. T M [ set label energy ]" O2 G$ ?$ h1 x( m0 o( Z
[ set label "" ]
. P& Q) X8 W: s* i ]
1 U' E- X* J: zend8 O2 c7 G, y- ]6 t0 d: e$ a" d
to reproduce. A; }+ B+ ]2 T
ask turtles [
/ I0 l9 f3 q8 }' B9 Z( y3 X if energy > 50 [
7 L* I! T8 H. C. y9 U* j set energy energy - 50- R: e3 b5 b) @- j
hatch 1 [ set energy 50 ]
# o# H, b, q3 G( S: X x: A ]
2 K* i* N. J( q) ^* v ]
; `/ b f. g1 }end. Y: _: ?7 G$ z* ?( m
to check-death( N# O' t+ p o$ s
ask turtles [' S% \# N3 ?1 \% m2 T( B
if energy <= 0 [ die ]
5 A3 |* t* [' F0 {4 x* y ]0 v" b$ F* c* f* ~
end' ]! [! ^! z+ Q* |9 |3 [: M1 h. p
to regrow-grass
! ]( Q7 K4 O9 } ask patches [
* q: {$ C/ ~5 Q if random 100 < 3 [ set pcolor green ]1 L/ _$ S: X7 v1 V& f
]
% y z: Y R+ |' G5 s" Zend
4 Q, B t3 i4 ]$ e/ M6 Q3 v: Zto do-plots
/ Q# G2 L3 E2 Z6 Q set-current-plot "Totals"0 R+ I3 e+ [0 m! o' D, G- j. B9 J
set-current-plot-pen "turtles") y4 I# L# n" {6 H1 b5 e' W
plot count turtles
6 D* g1 ?( e% o& e( z set-current-plot-pen "grass"
0 T6 I+ e ]: ~- m+ j# n9 C plot count patches with [pcolor = green]. R& X& S% x+ ?0 F( v7 J
end, o: p7 P' b" r3 @% W- p$ b0 B
可是运行时提示no such plot: "Totals"
% T5 ~ _' y( r5 X% Y" W2 I3 ferror while observer running SET-CURRENT-PLOT2 [# U& F3 Z$ u# ~- m' F
called by procedure DO-PLOTS
# \) v/ X+ `. N3 e called by procedure SETUP2 x7 o5 F9 H* l: e- E2 W
called by 按钮 'setup'
) D+ w. E4 T; b6 Y: d% ?求大神解答啊 |