我编的程序如下turtles-own [energy]: p" j! n v. \- a
to setup8 Q0 y t+ r/ w4 ? D6 s
clear-all& V5 W9 y: h8 |) n% t3 \9 L/ |
setup-patches
: {7 R' I$ t1 @; `5 A3 c create-turtles 100
/ f; v) P: e& j+ @7 O& e do-plots
7 b* @& |# u' {1 J, Y" ^ ask turtles [ setxy random-xcor random-ycor ]# A' \9 z/ {: L, X1 g! V: Q4 G5 N
end
1 n1 ^: \( s8 t5 C' Nto go B G; ~7 F- q$ H( a8 w Q8 H
move-turtles
a" D1 `: \9 A% G eat-grass
' M2 H$ b {2 b& P- n3 ] reproduce& t& Z5 a Q2 A) ^& K( `( {
check-death
/ a7 P0 J' g% [ w) a6 ^2 q2 N regrow-grass \1 S- M9 W7 p6 V& r5 `. o: _- |
do-plots
+ n: R! I0 Q# w* t1 S; vend7 V8 D$ @2 F2 }6 m; \: _+ q
to move-turtles
# v5 f- U( I) d% `5 y( G4 k ask turtles [
* c/ B( D8 E8 k7 n+ S7 B- O% _ right random 3604 `0 ^. L) E' O5 ?" n- |5 x5 X0 C
forward 1
) j% B5 _3 k* t set energy energy - 1
# C' k2 F$ y1 I0 E% B/ d ]2 y) ?- E- S8 @$ F
end
' D+ h) W! { s: x0 X8 k1 dto setup-patches( l( O7 A" j- c8 ], c/ {; z) e
ask patches [ set pcolor green ]
( }" N* Y/ |# r% D6 _end
e! L n* M0 F& R# }3 q7 pto setup-turtles, ^+ r- C3 V( T, \, a/ J4 ~
create-turtles 100$ E5 w* _; q2 Z% v7 a" n
ask turtles [ setxy random-xcor random-ycor ]
# S9 t+ E6 j% D/ q$ k; eend0 K4 b4 ^. w3 J b0 C
to eat-grass
0 h2 b/ I9 X1 V- _1 j D' p ask turtles [
5 M% S0 _: z4 z4 Q. K, i if pcolor = green [- r' j1 A: B4 l `/ i# r
set pcolor black1 F$ I! d. O+ ?) ]6 M
set energy (energy + 10)' ]+ J0 Y( @) q
]
Z8 Z7 ?; ]+ Q& c% i# V ifelse show-energy?, ~2 b- \' Z: E1 B
[ set label energy ]# r$ o# E( X8 [9 Y1 d, C. L
[ set label "" ]
# S" |* E7 o! Z% T. I F ]
3 _ z6 W1 H0 |+ `& Vend8 V D6 y# S( C o: I3 p
to reproduce1 S! A1 t3 X( t: x: A+ q3 z$ z
ask turtles [
e( i, r% A+ ]4 ?2 A, ] if energy > 50 [) i% E+ U8 e1 c$ R9 W
set energy energy - 50
3 u. j# X2 C! q; |& T1 i9 o hatch 1 [ set energy 50 ]: i7 l: C0 r3 ?. y
]
9 a7 s* x( R( R, B4 m ]
, r- r- P$ ?* U9 A9 `' Aend: E$ C( X2 O( Z3 B7 N# x k: `7 k; K8 `
to check-death. N$ m" l) D2 T" h c4 ?4 I7 d
ask turtles [
* N( U. \5 i5 ]* | D if energy <= 0 [ die ]0 U! J8 k& k/ f0 j, e
]2 L1 r A/ [3 |. N. k
end
! C7 n- P. l# n, V6 ^to regrow-grass
" O- C$ [/ n/ o9 D: S ask patches [* \$ ~8 n: K$ E! }; W* t9 ~
if random 100 < 3 [ set pcolor green ]% t# j' `+ C& z% F8 E* A( C% F
]6 L- v0 z% ~3 W/ ~1 W, k/ M
end1 Y6 B# t f# s" n
to do-plots) ^" u9 L5 p9 h& H2 P4 ?) K
set-current-plot "Totals"
" ?( p# ^4 }; o' Q set-current-plot-pen "turtles"* z+ }: F8 _ w" H( G
plot count turtles% X; G8 ~3 |% p
set-current-plot-pen "grass"% u) k* \& X. [% ?% K4 \3 L- R
plot count patches with [pcolor = green]; ]% {! b, U" K/ j4 U" G9 ?% h
end% {% X9 m9 _" n& u, U$ w
可是运行时提示no such plot: "Totals"2 X2 H% a' F# b' A
error while observer running SET-CURRENT-PLOT( h1 ^& O1 O/ z2 ?* C' H0 l
called by procedure DO-PLOTS
h3 [ A% ?* M1 Q+ T+ D, d called by procedure SETUP- V+ z- O+ P2 E" u) h5 T
called by 按钮 'setup'0 T$ V5 o @( \7 r
求大神解答啊 |