我编的程序如下turtles-own [energy]5 Z ?6 u( }6 G+ l
to setup
% \3 Z9 `8 [% H- X( F clear-all
' |' }2 N( x6 l; t setup-patches' b3 I% h% N: |0 Y
create-turtles 100
$ D( s k% y! H# e; C ` do-plots
7 v) B0 C( s( }9 C$ D3 J/ y ask turtles [ setxy random-xcor random-ycor ]7 S6 y$ t9 Z: k
end* t+ Y/ X* k& }1 f# L& p2 r
to go
V6 S* W; r' W1 Z( j2 u move-turtles
0 G; B* ^/ _5 v2 D eat-grass @) T, d0 Y8 ?) D6 R
reproduce
; Q' t+ x# j, [% C/ q* u check-death9 w$ }- d+ l9 a; ]
regrow-grass$ J2 ]9 J7 A* O7 ~- l3 d
do-plots% Z+ h( c* j8 }
end
4 O+ q& [. e5 w4 a) X! g4 g5 ~: Rto move-turtles4 I5 } }. R- L4 W$ g* P6 s
ask turtles [0 \) p" C' g! ?2 X4 f* t
right random 3603 b+ X# o# L8 A( |
forward 1) L2 y% y R* V, M3 h
set energy energy - 1; ^9 `+ s+ Y) ~$ F9 O
]
+ f$ s& z" D8 [/ I, c! M$ yend
! `3 V1 `/ _# K1 e- Qto setup-patches
( W+ h7 T1 M1 _ P! H: b ask patches [ set pcolor green ]/ Z8 w1 |0 y: G
end
; v8 U. ? d r/ {to setup-turtles; ^( z& b7 A _. i- S
create-turtles 1002 o4 F. x: C8 g. u/ ~
ask turtles [ setxy random-xcor random-ycor ]
' y2 Q; Y* M! E; Uend; T5 C1 Q# b) h5 O6 m) a7 y6 J
to eat-grass' h! d* F- U: `- {) @/ l
ask turtles [( u$ u1 P k& G* `0 \/ _. @! F
if pcolor = green [
' L+ B6 Z! P0 u9 w- D" E" Y4 X set pcolor black
; P& i$ @7 }; F) U: I5 H% v' I set energy (energy + 10)
, n" E1 X5 n5 P) \ ]
! Y- p8 n0 l% Q$ o ifelse show-energy?$ z/ `* v9 |" m; ?8 O3 d
[ set label energy ]" w+ c; ~" `7 L. H6 j- a
[ set label "" ]* E$ E% `" z% K: Q6 G3 p
]
* R, t+ c( Y2 g+ d5 l$ xend
" K7 ~( \, k- ato reproduce
' s4 |& ^; \" ^3 s8 z, \) ?8 K ask turtles [$ u0 A2 f6 W* Y. g, Y7 Q- A1 n) P
if energy > 50 [
8 N) s/ L6 Y0 T% M$ D. R set energy energy - 50' [5 X9 \( F; Y6 n! z
hatch 1 [ set energy 50 ]5 C; T6 H' t; F. e# F
]
2 F, {; w7 \ f5 F, \3 ^ x# m ]& T0 ^; h9 k& A) k8 q
end
- A9 Y$ K& s+ S4 wto check-death [' d( k" K. E" }/ g
ask turtles [
; J, F1 O/ R9 y6 U3 W% R) E: f if energy <= 0 [ die ]: p, q' J! B( Y% b, `" ]( f
]
: z) K Z0 I* ?end. ]4 J# I/ r. A ^' { u4 a
to regrow-grass3 w2 P- y* [8 D c6 r
ask patches [; n. D& A9 N2 N/ B1 `& ?, }
if random 100 < 3 [ set pcolor green ]8 z4 O |, K9 ~. G$ u& U
]
# L# B2 \& G% ~' d5 Jend% ]! i8 t0 s2 q" |. C0 g9 n
to do-plots* X! c3 z' G! N/ n* |1 H
set-current-plot "Totals"
1 n% Q% t0 s* A5 t- M' K set-current-plot-pen "turtles"
' r" W( v; Q' q e plot count turtles+ y( p- X/ s; B# o' w4 L
set-current-plot-pen "grass"/ H( t R; }* C3 H! E
plot count patches with [pcolor = green]& F- s" T5 s8 ]
end
* O1 w3 L2 p+ p' v1 ]% z6 y- u+ b可是运行时提示no such plot: "Totals"* B! e% D0 S( E# F
error while observer running SET-CURRENT-PLOT
& |# `$ z0 c$ U2 e called by procedure DO-PLOTS- g" H* g) E2 S; ]
called by procedure SETUP
4 R y/ `- F# U$ S# w( n2 k called by 按钮 'setup'2 O2 f7 `, X5 F1 \* S( p$ Q
求大神解答啊 |