我编的程序如下turtles-own [energy]
# {' K( f, k1 y' Eto setup
& E# u8 L: C8 L S* G; t; M clear-all" {* g: t- }# g' _9 Z$ N- w/ B7 z" O
setup-patches
/ J5 o( s3 x* h8 H8 B' W* q create-turtles 100/ r6 u1 t( `9 p( e% P% b3 ?
do-plots4 N/ B4 U( y- F: d
ask turtles [ setxy random-xcor random-ycor ]
# \; Q0 y# m8 t6 H7 P- G4 K0 xend% k& E. A! V$ r( g2 _) K
to go
" J, \4 d: c1 K% @ move-turtles
7 F, S: t% O. _$ r eat-grass6 m; B) f6 Q. F
reproduce! {$ ]0 ?3 D$ _3 n( N
check-death
, ~& ?- @) c. e regrow-grass
, Z E. A9 g# b. y% c: y do-plots* ^3 {8 |" M7 {- |9 K6 L
end% g6 _' S- j, U) d& V) m% T
to move-turtles, n0 [5 U/ u4 u) ~5 D
ask turtles [: ?8 L; z# V8 Q% q' m
right random 360, @# m# T, w7 Q% n( m
forward 1
& F. x4 ~2 B0 `1 ?: g+ W set energy energy - 1- Q% s$ r9 { D h
]/ h+ [; S5 J. q! [9 S# e4 K% l
end
0 M6 M; S' W( A; M0 }' J6 |& Yto setup-patches3 _) L: G6 P3 B+ g1 o& P
ask patches [ set pcolor green ]$ }: V- P5 W3 }% y ?. Q) i! I
end& E/ P5 _% ?6 F( T
to setup-turtles
& l5 j' j: \2 g; D create-turtles 100
. U$ l# v# j% V& [$ G% {# M& ` ask turtles [ setxy random-xcor random-ycor ]
/ ^: j4 V8 v: ?, kend
2 c; C9 [9 K5 @* l: y7 a# Yto eat-grass0 `2 X+ K: I& b6 ]* y
ask turtles [
3 Z! H2 F/ g& U7 o if pcolor = green [
$ a5 E' m2 \' h0 I' T# c O set pcolor black# l% q) R6 N- y8 S+ v, [1 P- |
set energy (energy + 10)
" Q8 {6 u% a/ [' S9 X; o ]
: Y. x0 B' w% y# E0 } N ifelse show-energy?. r8 s8 X, R. @" Z/ ]
[ set label energy ]
2 }9 N- A* r6 {. `1 v [ set label "" ]
5 U5 G/ Q% b* c% q$ R: u ]
1 j) ?/ o e$ U4 Rend3 J, |6 K& R$ X+ |9 F# m
to reproduce. Z" I6 A) s6 i
ask turtles [
2 F& u7 }% r4 d* R) O' C, q+ r' Y if energy > 50 [* h0 P* A) _4 Q( ~) j2 }
set energy energy - 50) T [, R+ D N: X9 w8 h6 s1 V
hatch 1 [ set energy 50 ]7 g6 H1 f( M% I/ U# a2 x: B8 L w
]; p+ [8 G; {5 p' u# _! P
]
, I5 M% k7 O" O8 rend
$ T5 }4 j2 b) @( G) s' g; `to check-death7 f" S% s! ^! |3 b5 H
ask turtles [( X4 k8 U1 K! r9 b
if energy <= 0 [ die ]9 P8 Y: H2 E# P3 z; g
]
~5 @9 ?% G5 N( a9 E5 d* ?6 Vend
" n Y3 Y6 h6 m' k7 ^, Ato regrow-grass9 k. U' \! C r& M% P) P& Y5 n( C j
ask patches [" i3 r: p6 M1 R2 c
if random 100 < 3 [ set pcolor green ]
2 ?- C5 O; e% X8 z9 s5 }4 f ]9 Z* V7 p, b+ p6 k5 H, A. Y
end7 Z, C; L4 L9 P
to do-plots
: a7 L9 s' x6 e2 p- ]- N Z6 h set-current-plot "Totals"3 _8 z' G# L3 l
set-current-plot-pen "turtles"
2 f4 ?+ R8 q* D) g plot count turtles
: l/ x# l6 H; n8 u set-current-plot-pen "grass"
" a! Q8 n5 g3 K6 V& ~4 O4 r plot count patches with [pcolor = green]
) P) O7 Y5 j3 ?7 Oend
* R2 l. r9 n# y& ]可是运行时提示no such plot: "Totals") d( _4 P( I* I" P- K
error while observer running SET-CURRENT-PLOT
' p( L5 C t$ B: K called by procedure DO-PLOTS4 G2 k2 C! W/ |) h6 B
called by procedure SETUP! d# ~0 F8 v' N' \6 R; ]% _
called by 按钮 'setup'5 D% l8 B4 C, }2 V2 v N' x
求大神解答啊 |