我编的程序如下turtles-own [energy]: }; m+ q$ v/ C8 x) E8 B2 T
to setup3 U" o; Q) k" m6 k! D; a* J+ m) }
clear-all
3 i3 M6 P0 P% e4 C# B0 q setup-patches
3 \- H2 j' g" J5 a8 S& L1 Z% V create-turtles 100
; J S# f( N8 r! \4 w; q9 D2 M do-plots t# r: K1 N: t& n0 O3 G+ C
ask turtles [ setxy random-xcor random-ycor ]% X& L% _5 o `
end
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move-turtles" G$ l; C% z. `" S: X7 `
eat-grass
! V0 ? s. j3 W! k; S0 W% g reproduce
' I4 n( k0 w+ e1 B# H check-death
5 N y. i+ N H: n- Q regrow-grass2 U- o: R# g( q" d
do-plots
; T G$ C1 S: u9 f6 c" l" ]' ]end- K0 c. l5 u# [$ [3 X1 p
to move-turtles
9 B. D1 ]' C4 C9 v8 {4 }, i: A ask turtles [! l0 A; |( X1 ^" s0 ~& I
right random 360. Y& @ p, f' B$ j& S0 z& F9 A
forward 10 ]: l0 u( V1 p, j0 g `* b
set energy energy - 1
4 |4 C. _ v! V3 f% L2 F U ]' A9 Q- a% z' T6 e
end
. H6 e; \' X3 x3 {to setup-patches
7 l5 [9 c/ s6 b/ L% Y" z ask patches [ set pcolor green ]
- X3 }5 j5 P# w2 c2 nend
& e9 g7 o. \* q) v2 l7 P7 q4 e5 \to setup-turtles
9 f. }7 x; `4 v create-turtles 100
. [$ r' |7 b5 u' R ask turtles [ setxy random-xcor random-ycor ]5 p& z7 s. q0 b! T+ `
end
, v7 J& s4 e, u0 Rto eat-grass1 A0 z0 ]+ s* H) t/ a% ?* ]
ask turtles [
5 |9 ?6 F$ d! ]8 d7 | if pcolor = green [, ^9 c: J, \' T2 \9 y" {, u$ E
set pcolor black
$ t; i* |2 Y8 J5 F# B& s set energy (energy + 10)0 [+ `( f/ @5 L7 R5 p2 o4 m
]' D5 ]2 y3 G7 H' q V. b' \3 N' Q
ifelse show-energy?
1 i# n- ` G; c* a, @ [ set label energy ]
d! o* H g& t( E% i [ set label "" ]4 c2 Z( ?' R! O# ~* p: W2 l
]
7 T2 D A; Z" H5 f# ~# k0 Xend
" s) V( C8 U# J, [to reproduce
# R$ \ b# D4 U- | ask turtles [
$ P# }: r7 q6 | y if energy > 50 [
4 [7 c6 G9 w5 l4 T4 Z, z! K set energy energy - 503 p$ C8 R& _0 p1 X' [
hatch 1 [ set energy 50 ]5 _, v: V( C' n+ y
], f! f8 H4 r( X; p% f
]: k. Q! J3 g" ?+ m
end
9 F0 i1 M) A% ~3 G' K' hto check-death4 ~9 | o( s* e3 t1 x! k
ask turtles [
( O7 O, }! Y! W1 ] g if energy <= 0 [ die ] c# A4 k/ D3 @
]1 |# a$ K C7 ~
end
3 G5 _ k3 M/ Q4 { Tto regrow-grass2 J8 V- l: ~( _+ q# Z- }
ask patches [
: x! a6 W4 T! S& t if random 100 < 3 [ set pcolor green ]
9 R1 ] o; l2 D& i9 g ]
@* q# n7 y. B: Pend4 T. g" f, D r) `/ N* q# n2 y
to do-plots
; y7 \# a9 k7 a( `( ?* d set-current-plot "Totals"
4 w" d$ q, G# r- Z set-current-plot-pen "turtles"* V9 E. i! e; n. y% }+ U
plot count turtles
$ C9 c t7 Q$ }0 Y set-current-plot-pen "grass"
! b6 F# N$ v+ L! s0 S9 @ plot count patches with [pcolor = green]
( \, d' L7 m% d( Yend
' d" s. R4 ~1 P4 E2 M& ^; H可是运行时提示no such plot: "Totals"
* ^5 U$ G! B: k+ O5 l( a9 Jerror while observer running SET-CURRENT-PLOT
: U* X. f- A; Y' p, b1 M' l called by procedure DO-PLOTS% g( B- ]+ S- m; i$ h/ k; r' k
called by procedure SETUP
! z' H0 \, i$ t2 p called by 按钮 'setup'
. Z& x. C. c$ I0 W; Z1 J求大神解答啊 |