我编的程序如下turtles-own [energy]2 W5 H/ n" P/ e6 c- f
to setup
1 j0 i$ t5 O# U z clear-all, k: G/ E) L# W1 J: P, q
setup-patches
& c, ^8 J' T4 M( b R$ e9 v* i create-turtles 100- M! z+ {; O9 ?
do-plots0 g3 R0 |- _; Z! q T
ask turtles [ setxy random-xcor random-ycor ]
& Z: _" ]7 t) y0 W' Z* nend2 Q* k1 z1 v. n4 z' U; M8 |8 k
to go8 N5 ?4 b3 ?" U: F2 ^- L; A
move-turtles
8 A. H- h# K) M7 V: A ~ eat-grass. a" p- ]3 K$ X/ r F; c8 y
reproduce! h$ S' T7 d/ N" ]3 o$ S; q a
check-death2 _3 g c; N+ l; Q* v
regrow-grass
0 G& f" M- [0 t% K& p% p6 r$ X: d% v% O2 Q do-plots
" j p( g) F9 L7 p+ Eend
) o- \: Q5 ^# w* }: b2 Pto move-turtles
/ b. v3 K6 j! E' R% x/ ^ ask turtles [
! n4 |6 e) Z/ @& x* f right random 360( P' p0 ]2 @! @& e
forward 1
' V! T/ c% z; | set energy energy - 1
$ H2 v: I9 @- B- K) [8 K ]
2 D5 g% _6 C8 ~end
- y! s X& [6 T5 Uto setup-patches" {/ Q: G! i. d3 G2 _4 E
ask patches [ set pcolor green ]
; _7 l; s% R6 l/ O8 c5 f% B' Qend
$ R i+ ~/ R/ e8 [to setup-turtles
# | ?# w D: `( @ create-turtles 100
) F8 P2 F) E7 n/ P$ Q ask turtles [ setxy random-xcor random-ycor ]
) @! g: Y) @8 n# A9 j/ |' Gend
% u% V/ | ?; {' R2 Ato eat-grass4 n: Q/ m; @8 e- k# m8 Y; X
ask turtles [
# b5 b8 @8 Y9 Q$ C if pcolor = green [
0 \- K: a1 ]' a set pcolor black
3 C7 R7 v% W7 _. t" Z set energy (energy + 10)! z p! c% c( z7 B5 J1 P5 ~
]% l) [5 e2 w! n* _% e0 e% d3 e
ifelse show-energy?
+ {- R H! ]& C) e [ set label energy ]
9 X4 w# R. C# K7 O- T2 ? [ set label "" ]
$ P! a' {9 n* ?3 ^+ n ^ ]- t/ o; _( [( Y+ C$ _
end
R! D$ a% ?; N4 L. x* H2 N# Lto reproduce4 K+ V% X S. m! W& F
ask turtles [
( A5 W% u: t+ i7 [5 \ if energy > 50 [- F! m. s+ n% q; J% {0 `; \7 x
set energy energy - 503 P5 x- n; P- E: _$ m k
hatch 1 [ set energy 50 ]
5 f# O! ~; ~, Q4 V& y; t3 P# P U ], W! U) k9 g+ l2 |# w3 V. z( @
]. ~6 x. G! ^ b& U1 d
end/ o1 p: `! v1 o! J* T- Y
to check-death
: y7 D$ t) \, V7 A7 |* y ask turtles [* i& b w4 j4 `! R5 w
if energy <= 0 [ die ]
3 O! X1 k* g* D) X# | ]
% ]; j) a4 {" z- kend
- ?4 m" m# \' v. o8 p7 ^to regrow-grass
& T- I5 W4 a( T ask patches [6 H6 T8 ^/ h: f- f
if random 100 < 3 [ set pcolor green ]
" B, n/ F6 \( m/ c ]
6 M3 }7 [& z: W; L$ O( ^% n/ yend
! ~; W: i+ m1 M( H4 R1 uto do-plots
( }% t- ?! }4 ?: y) o6 J& P set-current-plot "Totals"
8 j6 y Y) e; L" R set-current-plot-pen "turtles") c' ?/ `1 C. u+ |; V K- p
plot count turtles7 t- V& `" }: l. t8 l
set-current-plot-pen "grass"( J5 h1 G- | d5 K
plot count patches with [pcolor = green]
8 L4 p0 W. ^. S* ~! Dend2 S' a0 m$ D- p# [5 W
可是运行时提示no such plot: "Totals"
& }# V C0 m' S- g! L; Zerror while observer running SET-CURRENT-PLOT( v( ~1 f) v6 W( k4 V! m4 |
called by procedure DO-PLOTS2 l5 V, z+ V+ m
called by procedure SETUP3 l; z6 l: z- c4 j
called by 按钮 'setup'
5 w1 @# }) p ?6 o求大神解答啊 |