我编的程序如下turtles-own [energy]
' w& Y1 q+ I6 Q7 N6 wto setup5 o P+ @( Q/ W/ q, g+ [) Z7 T
clear-all8 L$ I; I3 `- X% J( _
setup-patches+ V& h1 f1 K% W
create-turtles 100* M+ y" r7 {$ }( b/ v
do-plots
9 s. f6 d1 a- M& F! e ask turtles [ setxy random-xcor random-ycor ]
6 q" ]) Z; }2 @; mend
) y5 h" n; Q$ @+ ~9 _to go, v) {" T7 U% i: d$ T2 P) V
move-turtles7 N9 p9 [0 A4 O! `
eat-grass* ]( e7 A% j% F
reproduce& @& U" h. f2 Z/ K
check-death
" ^% x7 \/ F" B, u regrow-grass8 w& o! z4 D5 _6 s0 @! @9 I
do-plots
9 g8 p% {1 T- f5 v! fend
6 J6 Z& ?4 W& _/ Y I! Zto move-turtles( {. Z* P$ ~( L/ h
ask turtles [: t/ o4 X0 X3 L; o/ m- K8 W
right random 3602 z+ k- ^" N1 O" \" e8 V
forward 1
6 D% l8 {* S: e set energy energy - 15 ~; I5 s$ p, p
]
; ?- W# k2 b6 t* a, u: gend
E5 G6 Q5 x" S1 J! c" ?to setup-patches
* p3 E7 U4 T- ` ask patches [ set pcolor green ]! r4 `% E* G/ [3 M0 J* C6 j
end
9 n0 ]: ~% F4 s0 U- t* z% kto setup-turtles% ?% ^3 l! s* h) C) K3 h
create-turtles 100
# e1 B8 @8 B+ w8 G. S [7 Z4 }7 V; T ask turtles [ setxy random-xcor random-ycor ]9 L( F7 u0 Q& z- k' H
end" t8 k1 l- d$ z: D$ i
to eat-grass
6 |2 Q( i( W/ [$ V7 y Y ask turtles [2 ?: l% D# T2 |& B' K, L& s) d
if pcolor = green [
9 K: u" x3 j1 @/ v set pcolor black) r0 k( s4 }1 i2 O0 r) W
set energy (energy + 10)) S, E1 M8 g K& y C! o
]
$ M4 y- k# z( u# x ifelse show-energy?. U. E( m Z, @1 j, s8 u
[ set label energy ]
6 {: F. Y/ E2 C3 y( ^ [ set label "" ]
& k$ d6 K/ f9 p ]
. \! I; T& g1 w/ n. Hend: L7 b# I8 ?8 M8 n. `
to reproduce
: J- \0 D; V0 m( ~2 L5 t* r, V$ @8 C ask turtles [2 c# V7 @# y7 p6 [6 S
if energy > 50 [
( v( _$ L# a6 e% f( w, O/ `8 c set energy energy - 50" ^! {. ?9 `8 y$ l& O
hatch 1 [ set energy 50 ]
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]
) S- U7 H. w5 Y- nend: d" T: u: B: X; ]& u
to check-death
h: N- H9 Y7 ^. ~; b, Q; n! c! s ask turtles [$ f z0 |. d, e4 o4 s& ~. ?
if energy <= 0 [ die ]
+ Z& P) W3 k1 H- X f% B ]
, w6 g$ R- Z8 s* iend/ T6 P! a" A( p% x; w
to regrow-grass3 e/ Y& {( k0 t" g" l7 t% C
ask patches [. I0 [" ~ L; x3 f' G& X
if random 100 < 3 [ set pcolor green ]
; Z& o8 q6 J6 d( B( {4 ^9 I# z+ v I ]
2 B/ }8 \5 R. X+ s8 _, {- _( Rend6 I5 L3 w+ c T1 ?
to do-plots0 I: n& }8 ]' o: e7 d0 l
set-current-plot "Totals"5 [, g8 @8 `/ v4 U
set-current-plot-pen "turtles"0 s" b) |; I1 a: K( I
plot count turtles
7 c. i# |, M2 k, v set-current-plot-pen "grass"/ h+ [* B1 z4 d6 n" H% B4 w
plot count patches with [pcolor = green]9 O: ~) K- U% S7 _
end0 X2 }4 H- h. _) r) x' o/ H) Q$ i
可是运行时提示no such plot: "Totals"
' u) r" I- u3 perror while observer running SET-CURRENT-PLOT
/ M2 `7 l* A' Q% R called by procedure DO-PLOTS! g3 L; z) _" ? \: C
called by procedure SETUP3 M% U- \; `3 F H
called by 按钮 'setup'
S9 H/ x. ^ E" ]3 d求大神解答啊 |