我编的程序如下turtles-own [energy]
- _5 n s! i3 }- g4 ~8 e0 g& Kto setup
/ r; y& n- p1 q4 [ clear-all C) o9 @* e3 c) L
setup-patches
3 B1 U b+ d5 b create-turtles 100* P* F( ]4 P4 t9 P X# ?
do-plots
! Q$ r$ Z+ ~+ d- c* y0 J9 m ask turtles [ setxy random-xcor random-ycor ]
5 t8 b/ n9 r+ F7 q* e8 [end
. r& L" j& {3 L* H% g9 nto go2 n! o& k \) Z8 n
move-turtles' N. a: f7 H! U, S) S# L2 ~) N2 {/ R* {
eat-grass
- h. {4 D( g3 j* X/ D5 u' ~ reproduce
& l' _$ M8 e# p# {: q+ i q; B check-death
1 [! L# B; k) w4 d6 ~" O+ d# l" T regrow-grass
( f& \' H0 }; ^" ]) H* J do-plots; s' b; V+ S& A) h# K
end& ^ S# p% q. w8 b6 D) t
to move-turtles
6 u: q0 z6 C4 k$ C4 A" v% S0 @ ask turtles [
) Q4 Q: u( G$ E% S' [' r$ p right random 360, _6 f9 H: ~3 F* R* [/ M( H
forward 1
4 M/ S- ]$ V- x* ^ set energy energy - 1) m4 }6 O e6 F, [" h& ]# B+ f
]
0 j& Q9 m' b% G0 X( ~end- y' W5 w7 W f! l
to setup-patches
" E2 @7 b3 L) _6 g0 [! K+ e ask patches [ set pcolor green ]' M9 J; h4 ^0 u4 F8 z' N1 @* m
end- T9 |- ]& w* x- s6 i0 z5 G! [9 S8 {
to setup-turtles
* H6 K( {6 J0 I! P" s6 | create-turtles 100
# ^4 ?* @( N% F2 v ask turtles [ setxy random-xcor random-ycor ] I# s; z( p5 ^. Q: {3 ]3 N
end% b+ m# g4 S& U2 B. b/ @* z
to eat-grass1 p. l- b- b& r" J( f. |# @
ask turtles [
4 L* V3 b# ?- T& _0 \ if pcolor = green [' Q( j5 r8 M# h# p0 @; _5 b) w
set pcolor black
- Y* p7 x9 f2 n# K+ s8 k$ q7 N3 { set energy (energy + 10)
@, ]* s0 \2 N0 @/ ?5 \; I# c ]
3 Z. E: h7 o2 v( c! e ifelse show-energy?+ O( Y" M+ {0 j( I$ E( G5 c: |
[ set label energy ]& O; [ m* p: o8 ]- v J% A
[ set label "" ]! W: u# q& u! i3 O4 [+ z5 W
]* W( w6 E0 k2 I( m1 b
end8 Q) h U3 _- C/ c8 t
to reproduce7 m/ c! v6 N& O+ U5 ^" v2 b
ask turtles [
; B( c+ G% t% W! J if energy > 50 [; `" ^% t4 d/ d0 v! t# w
set energy energy - 500 _1 U$ f7 G6 g( P% A( r
hatch 1 [ set energy 50 ]
$ o3 L& j! z; _ ]! p: h# W5 ~( }8 I) `- H4 ]. R3 U
]/ ]( W: i" d% g
end
8 E6 V; y$ ~0 t5 Z5 V1 Pto check-death
" C p- A" H3 K" h# j. x# t ask turtles [
* E0 X# j$ k! L. g# O if energy <= 0 [ die ]
! N( z: I. {4 L7 d( k2 J ]2 `; N3 S( f& C2 {& h
end9 W' B; R3 Y2 d
to regrow-grass
' L; R: D5 a3 S! c& r ask patches [3 ]! `0 v7 e; ~* y: t
if random 100 < 3 [ set pcolor green ]
3 O% y2 w, A. r2 \2 {. q ]
; a( G! z, `' d, J, k2 Qend
7 f: m# b& @( q% f! bto do-plots
7 Y: [2 o" A9 v) ^ set-current-plot "Totals"5 x( }, i# b9 T! {6 g
set-current-plot-pen "turtles": V" |; v+ g: [; h4 |
plot count turtles- r: Y4 F n! c- V+ q5 P; m& w4 A
set-current-plot-pen "grass"* }' | E9 |0 [ j) P- n
plot count patches with [pcolor = green]1 E9 C* m V* R' O# r; ?: d
end% Q, Q+ ?: W$ { f* }+ M: q+ D
可是运行时提示no such plot: "Totals"
8 b/ \6 I+ ^6 G( g' ?error while observer running SET-CURRENT-PLOT5 [/ P- u) B+ L. H& p; {( `
called by procedure DO-PLOTS
2 @ O: S; a' f9 Z% Q- ?; g called by procedure SETUP: _) M7 k3 x0 ?5 X1 o
called by 按钮 'setup'' f c3 C! A% P+ [9 O* n
求大神解答啊 |