我编的程序如下turtles-own [energy]/ R6 j1 [7 P% V4 o4 t
to setup; B! j2 B& Y& D
clear-all c1 e0 ~* a" e' u: Y0 v R
setup-patches
" ^' b, o g5 r/ w Q9 l create-turtles 100
8 t: C6 H; R) d do-plots3 D4 `" m/ I1 a( J" j; s
ask turtles [ setxy random-xcor random-ycor ]! q& s7 U* h/ O, X3 I: a, o! o2 }* p( y* n- s
end
" J4 n( `& x" @4 l2 Ato go n2 [- C; T! K- G" l6 f
move-turtles7 J- y, a, A6 X% g
eat-grass
. u/ h+ w0 ]9 ]9 }% ~ reproduce4 i: D6 n; W. n
check-death% Z( L2 u: s ]( L
regrow-grass! V6 A2 Y; H4 G3 k3 k
do-plots
. r% z0 H" _) gend
' r9 g* v" l" ?to move-turtles& w) i( G. ]" _% w
ask turtles [
/ Q' Z) A/ O1 L5 { right random 360$ g9 b$ J: n! Z. e3 r4 {! {, L
forward 16 B! O# L) G, x$ F$ i: p4 s8 {6 J% E
set energy energy - 1
K0 r9 Z: U. E" ^ ]
( K c; T/ a& K5 S+ n4 qend
6 ?, d) ~0 b$ a8 ^to setup-patches
# B& \$ P5 c+ A* g3 H/ f0 Y, w ask patches [ set pcolor green ]
, J' P. W9 s3 b9 L! k" h/ b' |2 mend' ]1 T& w3 }8 |! Z
to setup-turtles; z& E: t5 P# j8 c. K- ?
create-turtles 100
# v* L4 U+ l1 [% h2 M ask turtles [ setxy random-xcor random-ycor ]
7 C6 F7 e/ t! U# P/ T6 Zend4 z- d4 C9 V% p' e& _3 N
to eat-grass5 F/ J; Q. o) }. D9 q" {
ask turtles [
/ X o6 Z1 G) C% T% q8 i, c if pcolor = green [ T+ Y9 _. q9 V" g. j2 |' _" [
set pcolor black
3 v, w' ?" _! r) e3 e( Y- F set energy (energy + 10)9 H8 Y2 h: G8 w
]
# ?$ I: L4 }# }3 q. f% M; P ifelse show-energy?
9 A1 Q9 t) g8 Q1 {9 }) T [ set label energy ]% r$ I2 C* z, h* t! Z
[ set label "" ]2 q' j( o' ~5 K ^/ o1 u
]
- a1 D& m' Q) `, ?; O& c: oend
3 Q+ Q T! O8 z/ Q( N6 Ito reproduce! c7 G" @( r0 }' Y& f" M7 u0 {
ask turtles [3 I% D/ F5 T: V) `; j; q5 {
if energy > 50 [
; D# j8 ^' `) f4 W set energy energy - 50! j. w' U5 e9 w3 n
hatch 1 [ set energy 50 ], x3 `8 o0 q |4 `7 x3 Q
]6 m t7 O! f/ ^
]% Z! l2 f H- h
end
: b( u% E7 i5 W7 }) @to check-death/ C, |+ Q7 w+ u+ s0 C! @7 T
ask turtles [
! C; [- g- X3 H! K" Q if energy <= 0 [ die ]& \) [' \! z2 W- W* k
]
+ s. _; c" W- I `, ~3 Q+ _end, P9 C1 C p/ \$ r, z# R
to regrow-grass E) M6 P/ o2 K+ d
ask patches [7 t6 C' q* M2 u9 C; {1 g4 f
if random 100 < 3 [ set pcolor green ]: p4 P2 n+ ]$ u
]1 v! \6 I5 ?2 P1 e: A% ^% E# z
end" F/ \( v( H' W0 A; n# e& F
to do-plots! q" g& @! V/ N- C
set-current-plot "Totals"! Z- m& F3 R: d. d
set-current-plot-pen "turtles"
: A9 |% b4 `1 ]3 z( D5 p plot count turtles
- M" T/ C9 E2 L y set-current-plot-pen "grass"
3 M- Y0 e- z L) E7 g( C/ o plot count patches with [pcolor = green]
: z# t4 h( Y) _8 h1 B. Oend
. E0 a2 V) w O9 M可是运行时提示no such plot: "Totals"& f4 h( A4 A0 T
error while observer running SET-CURRENT-PLOT) h% u7 N7 O1 M7 D* A" T
called by procedure DO-PLOTS
9 m7 I. B5 t# |( U7 m' j4 V called by procedure SETUP; K! X7 J( X6 n
called by 按钮 'setup'
5 k* y% n$ e: Q% z, e2 y求大神解答啊 |