|
|
新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
: s! u8 D& x8 \* S2 s- ]2 Wnetlogo自带的social science--traffic grid这一例子当中,3 r5 i! I. H1 b$ }
globals
6 ^3 R) D+ ]6 p) a[* t1 k2 z4 P% \, V$ _
grid-x-inc ;; the amount of patches in between two roads in the x direction
[4 L( [7 w1 m7 p2 { grid-y-inc ;; the amount of patches in between two roads in the y direction$ n! \8 U4 x( ^. D+ V( T" g8 s
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 ^+ k# _9 Z3 Q# X3 } ;; it is to accelerate or decelerate
, q5 f. c* b+ a4 Q0 d* D phase ;; keeps track of the phase- L: p9 Z4 k3 @' X, |0 s" k% g& ~
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
8 l7 G. B" I3 l, F" V current-light ;; the currently selected light
; [. i) w9 {5 \
8 g! W$ @, ^3 t0 u0 v8 F+ {9 a ;; patch agentsets* M \5 B* h$ w. h9 o
intersections ;; agentset containing the patches that are intersections3 b1 v7 N( G8 ?
roads ;; agentset containing the patches that are roads
. [9 D+ \- }) b' Y* |3 f; J# V]3 J2 X/ x& }) r$ F! v$ w- @6 J
2 x( D6 f7 O/ E8 e' b4 F3 t5 T
turtles-own
" x+ D1 s7 L' ]5 m. Q. P A' q[
% ]1 v+ `- D/ k1 N7 | W speed ;; the speed of the turtle2 c2 H0 N0 D3 W- T3 y) L
up-car? ;; true if the turtle moves downwards and false if it moves to the right) L: w& I# W& S4 C* d- \
wait-time ;; the amount of time since the last time a turtle has moved7 N- ]: ]% R; O
]
$ ^$ R* f2 y7 E2 J* G0 H: f6 @
patches-own
2 X. t9 H) O& V/ i[7 d: a/ W% P2 `0 ?, B7 v) A! \7 a
intersection? ;; true if the patch is at the intersection of two roads
% J/ D" {. Q4 j7 _. Z8 r' _ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) b4 d- x! Y$ E7 N8 _; ~ ;; false for a non-intersection patches.. G- b& @. \: R0 H3 ]: W: S. u' y
my-row ;; the row of the intersection counting from the upper left corner of the$ L* I+ D# T; y
;; world. -1 for non-intersection patches.2 F9 I) I$ C: [& d: e
my-column ;; the column of the intersection counting from the upper left corner of the; v$ j( D3 v' C* o4 ~: Z2 e5 Z
;; world. -1 for non-intersection patches.$ ?/ `$ y/ w/ r6 C: T: K6 T
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( L: j9 {% P% v3 Z* n auto? ;; whether or not this intersection will switch automatically.2 S9 N6 C4 q% v& W4 d7 O
;; false for non-intersection patches.
/ {# V( {8 d% M) `]
/ d* n1 T+ \4 A2 v. q
" @2 v4 m* u7 ?! M; _/ J6 c& \2 D+ ]
;;;;;;;;;;;;;;;;;;;;;;( [5 O; K- a v8 ~; K5 R: g
;; Setup Procedures ;;
7 O' |/ h- e# t \;;;;;;;;;;;;;;;;;;;;;;* q. u+ ^9 q7 L1 J) g8 K
9 R$ I1 O& S0 e& v9 a H8 `1 `* X! U
;; Initialize the display by giving the global and patch variables initial values.& s+ L" u M& f# r9 B* {
;; Create num-cars of turtles if there are enough road patches for one turtle to8 o* M( P2 ]3 e+ |2 K
;; be created per road patch. Set up the plots. v% a8 \. Z: d+ |/ b7 a$ U: B
to setup
& o( Z5 S3 w4 \$ z. G/ T ca
; n9 w: R: h& Y* n+ V( U. l; S) t setup-globals
5 {) i3 }! m/ f6 r1 o% L- K
( h2 I$ L$ E$ _( | ;; First we ask the patches to draw themselves and set up a few variables
, Z8 p: g8 d+ ?& U5 w2 |9 ^$ i setup-patches) ?3 \, _; ]1 K
make-current one-of intersections4 P5 q- k9 l+ z4 ?3 c% f
label-current
5 d$ R f+ K3 j5 j% e
4 G1 S# C5 N3 [6 s/ H; _ set-default-shape turtles "car"9 W8 R# b0 e3 J
; `5 P3 r4 f3 D D O
if (num-cars > count roads)
% i: W. L( t' w! T: P. G, A( }4 L4 v [
* k' i$ H- x3 G9 c' _5 Q' Y user-message (word "There are too many cars for the amount of "
5 o/ |2 r Y0 a+ @9 l "road. Either increase the amount of roads "2 d- S+ G' E" [" L
"by increasing the GRID-SIZE-X or "2 f: @1 U5 v1 M9 P2 P2 Z8 |2 Z/ s
"GRID-SIZE-Y sliders, or decrease the "
1 a8 C. S- k7 u) y* n& m3 Z4 z- Q "number of cars by lowering the NUMBER slider.\n"
9 j R+ [3 W/ K. t! O; N0 T) ] "The setup has stopped.") H$ E. G f3 D5 I- c. O
stop
+ ? A/ B6 D6 Y |2 _% ] ]! o; j% K( g1 q: p; R- y4 p
; t: R+ n$ {2 }: w* H: u
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ R1 { u" Z8 W, h9 z2 {# Z crt num-cars, e0 e+ E8 V v
[
1 F a, p" m, X4 M4 ^4 F8 j setup-cars9 n" u1 p K$ b% }
set-car-color2 l( q2 w" i- E0 `# k- t
record-data& K8 m" b$ F/ d% f3 A! `
]9 S/ v# o; r8 _" V
0 `* |/ k, ^ T) g; W ;; give the turtles an initial speed, c0 O! R V( q" ^! S7 n8 |; r: H
ask turtles [ set-car-speed ]
# L+ @- |& u5 P t. _
% W. R/ K1 Y+ Z9 [6 \+ J reset-ticks4 `% F4 C$ n: ~4 ]. _
end
T7 h& _( i* V5 \. y) z8 `) x' }
;; Initialize the global variables to appropriate values
) u% o" @3 m) o) Eto setup-globals
* D' I; l7 ^1 M# ?, q; Z set current-light nobody ;; just for now, since there are no lights yet
% e" n) S: @( G' \& Q7 j: p& U" g set phase 0
b5 p! g1 p; R O: L- n set num-cars-stopped 0
# B$ F& D% g- n set grid-x-inc world-width / grid-size-x- L* j' x% m0 W# e" h+ X
set grid-y-inc world-height / grid-size-y
; D4 ^$ ^% C, }4 L6 `* f; S$ L
0 b6 j! G+ w( L7 y T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 A; j% u$ l v+ q2 x% ^' c set acceleration 0.0994 _" A. i+ u2 n$ M l
end* a2 G- I M' g$ V% k
. t+ H# N% U- h# p# X* k$ @
;; Make the patches have appropriate colors, set up the roads and intersections agentsets," J+ e, w( H D& p, A+ J! ?
;; and initialize the traffic lights to one setting
) W7 F( ~* y( G' g8 E" fto setup-patches* h" M8 A; `/ F! M! x( C& d) z
;; initialize the patch-owned variables and color the patches to a base-color
9 ~" h% c% L& J ask patches
1 D8 A& }8 }5 E/ d [! L- k& E. c" }) s4 o) g! y0 Z
set intersection? false7 [7 }, o- w# D/ g. s5 H) g
set auto? false
# A' p$ |8 h1 @+ x! B set green-light-up? true
/ J% Y# D1 a) m3 b: {4 D& M set my-row -17 o3 d# a; v0 Z7 Z( v9 |1 p
set my-column -18 y! ^& @' u" e* s8 d! H
set my-phase -1
2 j& |: Q+ u k4 R set pcolor brown + 3
9 l9 P, \- X9 R ]
! a2 ]5 W, J/ u" ^' T8 S( q# C
;; initialize the global variables that hold patch agentsets, S w$ z k, F3 g
set roads patches with& T; Y/ o# C% V: d! Q% l4 R5 ?3 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ {! U/ ^) N! q v (floor((pycor + max-pycor) mod grid-y-inc) = 0)] m$ q5 Z5 L3 F8 F$ i* o2 w
set intersections roads with( M- H4 ~1 k# z2 a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! m } W# A! d9 ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; h! i% t) d+ R) T7 v+ H- C6 R* M) u X. b5 c" i
ask roads [ set pcolor white ]$ `' B$ r: ?' W, b' }% Z
setup-intersections
6 j/ Z( d) I/ J, U+ Qend
# p* ?) I) q p7 j2 @* C3 i其中定义道路的句子,如下所示,是什么意思啊?1 _+ N: W2 A: N5 y/ u1 g9 ?
set roads patches with9 \9 O O6 z7 G. s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 m8 y* Z9 d: q/ Q7 X6 ^: g/ b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 }) b% ^+ ^7 w2 Z6 ?谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
|