我编的程序如下turtles-own [energy]
; g0 e2 Q# R% O7 K9 P7 |1 ~% s& F& mto setup
! V4 @: ]) x# Z$ M6 \1 j( l clear-all
. _ b7 K: }( g1 Y) T9 ^3 T setup-patches
- k( T# Q7 Z7 V, \9 A create-turtles 100
8 w3 J# @% E. j( `% i! ~! ]& M do-plots
& z& _! H& r6 R" ~) m' B# m ask turtles [ setxy random-xcor random-ycor ]6 Y2 P" d2 t* Q4 ^
end: x% i3 j; t0 t$ P0 J
to go
, H6 N5 M4 u$ i& X5 k, W move-turtles! m5 H r$ q! l* b% _$ K+ ~2 |/ O
eat-grass+ m K, A: L* ?! I; U# k
reproduce
) F( I# ]+ a* s" u+ g: l7 F) ^' l check-death
, N3 S& |- f, P$ q# j: U5 J* C regrow-grass
4 R+ l6 q7 ~& C do-plots
r6 M* P; y" u& S8 O6 l! pend
& i4 E# f4 I& l2 Sto move-turtles
* a( q! T4 V# \% I/ h2 O; @/ Z ask turtles [# h* q, \! x' p9 Y
right random 360- w, r/ V- F+ ^4 l+ d
forward 1
' b& A4 S# h. a" z# M0 O2 M" n set energy energy - 1( z* x# c) I+ R( Y9 o* A* J$ l
]
# P5 ^0 x- m+ G4 oend
0 U2 |: E2 Z7 \. r. Ato setup-patches3 D: F$ [$ U0 {4 F
ask patches [ set pcolor green ]
$ y8 t8 o' n5 q& A$ Rend1 d" Z) \. `/ U* |$ i
to setup-turtles
" g+ M$ H+ S" V7 ^* Z create-turtles 100
5 V2 M- z- p9 B) N4 S! [ ask turtles [ setxy random-xcor random-ycor ]) w8 X( H! o7 O2 T0 S! s5 c
end
# d, D. y7 d4 I! } ]3 ]5 d$ xto eat-grass$ U4 G6 j, S) S
ask turtles [* Z2 f2 |8 N. {& k# b
if pcolor = green [
, c: ?% G( D$ u( H6 Y set pcolor black
2 `+ H- b5 K! d9 j. ? set energy (energy + 10)6 n' o* C- {, v Z. D
]
! C/ \+ \1 U) o( D3 ]. D ifelse show-energy?& N, P/ f0 |9 P' j8 R$ ~: e3 n
[ set label energy ]4 H- M% J2 w! F' x
[ set label "" ]
+ W$ g/ U0 z8 G ]+ ?% V8 |9 b- K/ A% I& w2 t
end+ }- J) H( A, n8 W# w2 j
to reproduce* j8 f8 k' }, N$ J6 {+ G" p+ {, j8 J# P/ J
ask turtles [# _& X0 |$ O+ y3 b
if energy > 50 [
' H/ I+ E% p) D/ M* `$ d& m set energy energy - 50
% ?4 r9 ~! ?9 Z8 e: ~2 H* ~ hatch 1 [ set energy 50 ]
$ z1 X9 ~: W; I" }- I# U) i6 E2 n- a4 Y ]$ S) H0 K& u: b% G; @ S8 Z% T5 m
]
, D8 ^9 {1 J8 Mend
: T) ?% ~: y2 ]- w i, i: f- Sto check-death/ q; w5 a% o, @
ask turtles [! F! }4 j. W1 P, N! w0 I* D& m
if energy <= 0 [ die ]
/ r7 r9 C' ^. P; X/ c ]
, }1 n% J+ P/ k, X* R/ a0 lend* m, \, C9 b9 X! l
to regrow-grass6 t: D' d. i+ R9 f' ~' Q
ask patches [/ I, ?/ C+ G& e+ f0 u
if random 100 < 3 [ set pcolor green ]; D% A g+ N" Y- E8 b" v$ Z9 I$ O" x; o
]
1 x% t% w. n. c1 c, `$ tend
& V1 R0 y+ n5 z" ^/ wto do-plots
9 l, a0 |- X+ m! Z$ a set-current-plot "Totals"
. i+ v+ L5 Q* @ set-current-plot-pen "turtles", b8 t* ]' C9 H' r4 J+ K
plot count turtles
1 { c* U3 D# e/ w$ Q, y set-current-plot-pen "grass"
: M. x7 {/ R! c# h. D: G* x% q plot count patches with [pcolor = green]
. _2 ~7 i3 p# v0 f! P! nend
' i2 p' M+ v K* g" ] b( c# t可是运行时提示no such plot: "Totals"5 h! ` }2 c/ k: K
error while observer running SET-CURRENT-PLOT$ I ?( Y6 ^( u' a4 e
called by procedure DO-PLOTS
( F# k: k# T! x called by procedure SETUP
* N: t- o1 C: h1 c: k2 m8 W, `* ~* } called by 按钮 'setup'
( |3 R( M, W! H6 h4 {求大神解答啊 |