我编的程序如下turtles-own [energy]
* x3 ^% m* _/ J' x0 r; ito setup
' d' G, S! M5 i8 N7 H6 s+ s6 n7 E clear-all
& N0 e0 b! q( j( p( Y) }1 C setup-patches
; Q9 Y$ h: t: L7 V( K, L& [ create-turtles 100
3 O4 d; N* i5 h5 ^6 b# k do-plots
6 `# Y2 p$ _* v ask turtles [ setxy random-xcor random-ycor ]$ j, {9 w- O( D) }; k
end
" t0 p8 I- b3 j4 O- i5 mto go5 n9 G: H0 M' `" I
move-turtles% c$ v6 y8 x2 H k( [. z6 G
eat-grass
/ T- K6 L: {+ O& I3 T" X reproduce
4 O3 Y) W# o( o check-death
/ S# D7 E7 H8 [: r/ i( J2 t regrow-grass: u( X( f/ x, w2 @$ ]" A* z1 J% K4 w9 L
do-plots
, S6 F. y1 o1 K$ ^end3 g5 h9 W, Q K. K7 t4 Z( \
to move-turtles" l4 b$ d1 x; s _4 f# ?2 ]$ G
ask turtles [
/ I, [$ F: {; A+ f- p right random 360
3 }9 i: }0 [) h- c" n+ H forward 1/ W3 v# @9 r8 @/ Z3 l
set energy energy - 1
) Z: ~: I8 ?( Y9 \5 C; k ]- r6 n8 L/ J2 u w6 q( `$ u$ F
end5 k3 d: }. l2 T1 U
to setup-patches% L" T- e! h5 d3 r' j
ask patches [ set pcolor green ]& K3 K9 K8 \2 s# g8 r
end& a( Y1 b0 E3 h6 Y7 M# Q
to setup-turtles" a! _- p8 i4 `$ R
create-turtles 100. _( t* X4 u8 ?3 G: `8 i
ask turtles [ setxy random-xcor random-ycor ]
- c0 g$ u) e( hend
+ W: z5 ]) x/ hto eat-grass
7 l8 [% C5 G6 E2 m1 t$ v/ |+ m ask turtles [
: `7 D3 {6 ~- C, w/ X" S if pcolor = green [6 h U- a% c! T0 a
set pcolor black6 s/ j: `& h/ Z1 M
set energy (energy + 10)
3 z0 p; ]7 C b7 {0 c, {/ [7 M ]8 e" x7 n7 }2 B* V3 Y5 h
ifelse show-energy?, r* H2 D6 s' d$ E( ~, \, G( n, e* y
[ set label energy ]+ E* K# y1 p i b3 @
[ set label "" ]4 K* |( A+ `8 G( ]" D" k
]( G! e& D# e' n K6 O- e5 s
end* p% x3 u; P4 w. n8 d
to reproduce
, N7 V; g6 S! | ask turtles [# ~2 U f3 S& u: N
if energy > 50 [
+ p. p X/ e1 D; H7 }4 _ set energy energy - 50, S4 m! T3 @ R5 O8 T
hatch 1 [ set energy 50 ]
- F {& [' x. r) R# a. `: u ]
' v( B" M [3 i& r- m ]
; A$ O% v* u* g% n) [end8 W5 J( x; K6 S' r
to check-death* |4 l: e) Y) ]3 _) O$ J( s# F a
ask turtles [
0 C$ c# Y+ a5 H0 j+ T4 H if energy <= 0 [ die ]
* E- [, l& v% g- X8 h2 ] ]7 @' w4 h, b( m! s
end
4 |4 N7 D0 |. \; s! g3 ], a& A5 oto regrow-grass
! Z. E2 H/ V7 c3 e! A ask patches [
( G! A% V2 }: I: F" C$ t$ D if random 100 < 3 [ set pcolor green ]
3 n8 Q- A+ A* J. g( y ]/ j b" t; e- R) I
end
: `& B* ]# w' G( D( vto do-plots
8 u, F5 B6 B! a% z+ X set-current-plot "Totals"+ ~ J( \0 y, _% F9 `, b, p- W
set-current-plot-pen "turtles"" ^! [# `# c9 O$ y9 e) t1 E
plot count turtles6 x9 h {) T9 U7 v. y% S/ l( U
set-current-plot-pen "grass"3 L$ I: V8 E- ~6 v9 t5 D
plot count patches with [pcolor = green]2 I* e* z9 J% y" R& g- g% b9 R" M
end
+ L4 T4 |* H8 e3 |/ L可是运行时提示no such plot: "Totals"4 j1 S) Y0 i5 O8 ]& I( |9 X J
error while observer running SET-CURRENT-PLOT
R& e# `% ~: @ called by procedure DO-PLOTS
) E& l( |7 R5 I/ I2 f9 ~ called by procedure SETUP
5 e, H3 X% m. \4 t2 e: w called by 按钮 'setup'
& h5 Q3 m8 j% Y* n* x+ D: P求大神解答啊 |