我编的程序如下turtles-own [energy]/ h! |8 a$ w% d3 `/ P- J) n
to setup, [2 C$ k9 p A7 w5 l, b
clear-all6 v- r' ?9 K8 L; c( w7 P7 I4 R
setup-patches1 z$ |+ q3 {2 i1 d
create-turtles 100
% S% |9 k- x& }4 W1 t4 V3 d7 U6 \ do-plots( ]" ~0 A8 s4 T* n, g4 p2 g- j. Q
ask turtles [ setxy random-xcor random-ycor ]3 _5 T/ e+ Y I$ c8 z+ [. G& o
end
1 U# D$ H' S4 l$ D& [to go$ }2 n/ W; ^; M! {0 S' {8 N
move-turtles
) {( D+ g; R/ B* x eat-grass7 K8 c; h+ J) P5 y% ~1 k, B4 _
reproduce( A" Q# g9 a9 ~) s( Z8 K8 H
check-death
: k* a7 c% l$ w0 a regrow-grass) a, n0 K5 o- R* v4 l
do-plots
; j- d! q3 p/ O* F' J5 L3 fend
6 r) C; ]0 ]. e1 m) p7 bto move-turtles$ }0 S0 {7 c6 |/ H
ask turtles [
: |+ ?7 ?# v* r4 q right random 360
' l% e- R. g! a2 n+ |/ ^ W) ]0 U forward 1* y4 I. b% Q, R# R
set energy energy - 1
& v0 r o# K9 |( {2 l+ F ]
' n( s8 J. S" k* j8 t2 mend; U4 F2 m t8 D, p6 {
to setup-patches
9 F8 N8 y) C4 U/ F ask patches [ set pcolor green ]
3 p4 k7 f0 u4 y6 Fend" S0 C# B9 r5 {* _% |! G: {
to setup-turtles
. ]9 C5 \7 A6 E5 c" [! I. D# v create-turtles 100
3 C6 \) L- O. I ask turtles [ setxy random-xcor random-ycor ]
( T# F5 n& ]( ~0 _8 Cend6 Z0 b8 q; L; G4 n5 G( u! R
to eat-grass& V! f' ^5 b) C" G4 L
ask turtles [
& A/ ^0 V% y1 V if pcolor = green [4 E" J3 u) O {, M3 \4 O3 f6 z& T
set pcolor black
, D7 M1 P! e. n1 m1 T; Q set energy (energy + 10)) z4 i8 P) `9 E
]1 W$ n- ~( N8 s3 H: M( z, R; o
ifelse show-energy?
& V; B# F5 x6 J& {% p [ set label energy ]0 x% N& `1 J3 e, f2 {: X0 N
[ set label "" ]
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end: X# E! V& p+ R# i# ?) B
to reproduce4 G! K: Y! [" Y" w) j0 y
ask turtles [& a4 g: N$ g3 R$ e
if energy > 50 [# b8 }7 `5 @8 l: {8 F! n9 m1 Z
set energy energy - 50! D6 X. ~( y; J# @% B s
hatch 1 [ set energy 50 ]
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end8 D: j5 g* w5 E' o8 n q6 Z
to check-death
" B/ a5 n/ i! Y0 z6 q8 J ask turtles [8 ~% u2 W4 s6 J, e8 ~
if energy <= 0 [ die ]* t3 N7 ^! y7 j+ w7 |8 c
]
: X' {9 S" `6 Pend
: o8 u1 M1 K& p% F! j7 n4 }to regrow-grass8 u+ n0 p1 M x
ask patches [
$ f/ [, W: h! D+ F4 | if random 100 < 3 [ set pcolor green ]2 c4 h0 @* `0 r& m7 g. Y# j
]
) @3 N! d' |* n2 u' `. Xend1 Z+ x& \" d, a* E8 \8 G5 j7 F! J
to do-plots; @! e, S- d8 a! \/ L, M% B) t
set-current-plot "Totals"
: d3 u; r: m! g set-current-plot-pen "turtles"
: b8 B. H4 g% L plot count turtles" n/ N: x+ g& s9 {) O+ Y
set-current-plot-pen "grass"
3 ?" B) ~3 C+ n! p: N plot count patches with [pcolor = green]
- A }. n% _( L& xend
. U e! [* \" I4 z4 e可是运行时提示no such plot: "Totals"9 d' W+ {. y; _1 o3 i }: z4 U) d& t* \
error while observer running SET-CURRENT-PLOT8 A# e( R0 Z$ w8 r
called by procedure DO-PLOTS
# y& O+ t3 m& @8 V called by procedure SETUP) ?5 t. W6 H$ C
called by 按钮 'setup'# ]( p+ z& i0 A! Y6 U( Z8 m( j
求大神解答啊 |