我编的程序如下turtles-own [energy]
- J6 L6 r+ m# G; [7 o7 fto setup2 g$ }' c5 m+ ?6 L! D. S
clear-all
- k. J/ j: R3 l! X8 R4 W setup-patches
& r% X2 z6 w$ [" ^# C+ r' g$ J" m" r create-turtles 100
% {3 Z; P2 r* C do-plots
6 I; d7 n+ D- e% x8 R ask turtles [ setxy random-xcor random-ycor ]
) U5 M- P3 {- ?end$ L# P1 y) z) ^0 c
to go
, c! D( B% a/ z: C move-turtles' _' J I3 A1 g$ T
eat-grass J1 K5 f0 ^$ B7 X
reproduce
2 J' \. r0 {$ u! ^/ z% ?/ J% J+ G9 S check-death
5 O! n. P! O! M; \ regrow-grass0 D! ^8 y K U" R' R
do-plots
& d9 o. c& X$ o% g. r8 x* f- wend4 Q n3 w) g0 m) Z& Q* c W
to move-turtles
% W& z9 d$ i1 y ask turtles [
: L r# g- ?$ c right random 3603 |8 k2 ]+ | U
forward 1
) O$ H! H7 d: S0 ?; J) b set energy energy - 1
6 ]7 W* ?3 `7 q ]9 H8 U; G m! a3 w7 L5 q! N
end
! J9 ^. V0 E, {% a& @$ S9 U( ito setup-patches
6 y% V7 k: j3 r1 Q( Z6 J ask patches [ set pcolor green ]
) y/ ?( G9 Y j1 ~+ u8 ^end+ j% u! F; P9 V+ y' S1 k
to setup-turtles7 X' P$ U1 {4 _/ M1 p+ w3 N& j# O
create-turtles 100
0 g8 t4 R( T7 _, N! j ask turtles [ setxy random-xcor random-ycor ]
* x" L. q* E/ _/ [& E X$ k6 h, Wend
% |: J" X' a9 f3 c! Pto eat-grass
6 D* X' ]7 x- E+ k ask turtles [
4 [( h2 d. F5 H if pcolor = green [6 r6 a9 u" L% a6 @: n' Z
set pcolor black
) O0 |4 }) Y8 x$ f5 }6 `/ n) }, o set energy (energy + 10)
3 _: [# n. s2 @9 V ]" L% E! v: @5 O6 [( y, u8 s
ifelse show-energy?
) d& ~" Q+ ?& o. D6 Y [ set label energy ] P" L* `- k) ~) |7 j: | Z6 P
[ set label "" ]
7 i7 a& C8 K# ~ A6 Y. q. n ]
# V/ _& e J- \# n) |! w& Iend4 U4 x3 l2 N+ l2 Z9 l) C
to reproduce
, p. n+ X( h9 E$ G6 H ask turtles [
# }/ ?- u" \! D* F) O# B$ P6 v+ u8 e if energy > 50 [
. w4 u3 c+ y3 d6 Y: W* m, `& e* o set energy energy - 50
4 q0 y; G0 W/ R hatch 1 [ set energy 50 ]" B5 h. a) v3 z+ B
]+ H1 @. n+ G W* c, K
] k7 X9 _4 m, O& H2 U
end7 `' P' S" m# F
to check-death
) K& q4 h G2 f6 w1 H ask turtles [8 x6 [' e( m& l( b: w$ E; y
if energy <= 0 [ die ]5 z# F, @; L# u
]" x; ]& c R2 f5 d
end8 o/ |5 n, w+ i2 q; }5 I
to regrow-grass
3 E. u8 S- {$ C ask patches [
# ^- U$ g$ `2 [& f7 l if random 100 < 3 [ set pcolor green ]
3 w# L4 e" p% i& S3 u K3 ^ ]
& K, h; e, X& R8 L, Eend C# _: J! d5 O% B V$ y$ v
to do-plots
- T$ b( o- U! n set-current-plot "Totals"" V5 d( T- q7 ~
set-current-plot-pen "turtles"! x) q9 Q- U! {) w
plot count turtles' K G0 I1 X+ F* _, V# p9 O
set-current-plot-pen "grass"( i! I5 H2 Z+ C' r. ]* }
plot count patches with [pcolor = green]
0 z8 C' s. E1 ~5 k5 b& A, V& Hend( h: ~# c/ Q) j- [: g- x/ m3 j/ l
可是运行时提示no such plot: "Totals"
2 ~$ W- C7 N* f& I9 w9 \" verror while observer running SET-CURRENT-PLOT
$ Y/ C$ Y( J4 X' p5 G" Y called by procedure DO-PLOTS4 J. c. t1 x' f8 n
called by procedure SETUP6 ?) m7 O9 }5 n9 R
called by 按钮 'setup'( o4 }* s4 B# m" l+ r7 L
求大神解答啊 |