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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。 T* p( L% G! ?, l9 {
netlogo自带的social science--traffic grid这一例子当中,
" [4 O; @" p" b: L: h _' W [globals
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& q3 j5 L# M/ b; G grid-x-inc ;; the amount of patches in between two roads in the x direction s+ j& o& e# P2 U" p
grid-y-inc ;; the amount of patches in between two roads in the y direction
2 l* u( @0 f3 v) O! t8 F E( ? acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ z% V, x1 ~$ Y ;; it is to accelerate or decelerate6 P5 H0 E. T2 {9 W
phase ;; keeps track of the phase/ L5 T b$ m0 M$ J. J0 d* [7 F6 y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ B" e+ C9 H0 y$ e3 E0 f
current-light ;; the currently selected light% g+ B7 t# F2 E1 d/ u
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;; patch agentsets0 s2 p% l. F% h$ Q4 C: e
intersections ;; agentset containing the patches that are intersections
; b! x0 ? u( A2 S roads ;; agentset containing the patches that are roads
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turtles-own. b1 P' [. l: o) D3 A, x8 U
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speed ;; the speed of the turtle4 J4 Z1 M; `( x" X3 ^' @: x( m/ w
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ a1 R5 T: ] _ wait-time ;; the amount of time since the last time a turtle has moved
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- C8 N+ x5 ?" ~. _patches-own
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, S, A7 R2 h& y) w intersection? ;; true if the patch is at the intersection of two roads
4 R/ k, S: m7 n6 [+ Y green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 r) O4 m/ R! F! R) H6 w: G
;; false for a non-intersection patches.' C7 h) {4 l* b- c
my-row ;; the row of the intersection counting from the upper left corner of the2 M W( _1 b/ t8 ^) E9 |2 y
;; world. -1 for non-intersection patches.$ ^9 F$ x6 _6 y1 Y6 a E2 b; s2 `
my-column ;; the column of the intersection counting from the upper left corner of the
8 `1 S8 l2 }7 v) N/ c ;; world. -1 for non-intersection patches.9 S9 [& Y- Z: o e9 m
my-phase ;; the phase for the intersection. -1 for non-intersection patches.% ~. G. N0 x+ x5 g( v
auto? ;; whether or not this intersection will switch automatically.+ v3 a4 l2 [5 J* @, d+ Y! T
;; false for non-intersection patches.6 `: x$ J/ G/ j
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;;;;;;;;;;;;;;;;;;;;;;
: k. q( j- U9 q6 ~3 @;; Setup Procedures ;;6 ]. h, `/ e( B0 ?- D0 g' T. q. {+ w
;;;;;;;;;;;;;;;;;;;;;;
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4 I7 v% K8 {; `' G+ W t$ u;; Initialize the display by giving the global and patch variables initial values.6 p; A( X" ?7 e& Q- s3 `: N
;; Create num-cars of turtles if there are enough road patches for one turtle to2 c' X! O% P: ~+ _9 x5 H5 k3 Z
;; be created per road patch. Set up the plots.. }* p; R! I; w/ B# }& v! j
to setup
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) s' a: F; i/ x2 W' z8 T setup-globals' Z! R2 F- K$ w1 g
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;; First we ask the patches to draw themselves and set up a few variables
! y' O3 m- m {/ J7 T0 ? setup-patches! ~% j* S) x$ F9 t
make-current one-of intersections
! ]8 Y+ e y% F- v$ f4 \/ I. `% s label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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# ~- y ]! t: o1 K$ f! f user-message (word "There are too many cars for the amount of "
+ m; ~* f+ L. T& o, i, a "road. Either increase the amount of roads "
3 ]! f- h/ y3 t# a "by increasing the GRID-SIZE-X or "% k- v+ ]/ }( ^7 N# ^$ ^1 k
"GRID-SIZE-Y sliders, or decrease the "
: n6 Y) y. k2 G% Y "number of cars by lowering the NUMBER slider.\n"
1 _; L' T# b, f5 H$ v c+ p "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( t' q3 c2 N9 {0 ]# ~ crt num-cars; R+ ?+ J* }4 v6 [3 E1 k
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0 ?4 c* h6 z& d9 S/ h, d+ s setup-cars
7 f9 W, m% S' f+ T set-car-color1 L* r: ^. p& n4 E# T8 w: ?. F) o j
record-data
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$ `9 u( F8 |; U. Y6 x! d ;; give the turtles an initial speed/ F. l' x* a% g; S A3 S* N+ Y" m
ask turtles [ set-car-speed ]% N# X3 n# H! J9 a$ E A; i
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reset-ticks& c( R0 i2 s5 c# O. F% o. u
end
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;; Initialize the global variables to appropriate values5 z( r% I, e+ b8 v) a1 G9 I$ K1 k
to setup-globals) f$ h5 N/ I3 \
set current-light nobody ;; just for now, since there are no lights yet8 i! d% \$ v: K! p8 Z) z' z3 J
set phase 04 L" r8 N/ e( w
set num-cars-stopped 0
8 W- C5 V5 e! |; U set grid-x-inc world-width / grid-size-x) {, E/ Z( A( T- e
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 t4 b* f& G; M% v
set acceleration 0.099! x/ L2 x% N4 o- h
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" P( C0 ]1 F J, B' s;; and initialize the traffic lights to one setting
- k; S3 ]: @- J, I7 @) D3 Y" ~to setup-patches
% H' c3 q( ]7 v* i! `0 D) S ;; initialize the patch-owned variables and color the patches to a base-color
R: ^" Y G" F% y3 F7 ]7 v9 a ask patches
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set intersection? false4 l' G" K8 _1 O- s% B4 m. @7 ?
set auto? false; }$ T8 B' ]( y5 i6 u8 \
set green-light-up? true
/ G5 ^% H0 G( N& Q- o- {- n4 P- T$ r set my-row -1
$ l! V F% b: \0 K set my-column -1
! Y' ^% o. J8 B3 ^* C set my-phase -1
# a; d) ~ I, }; i \3 r set pcolor brown + 3* Z' j) W7 n& G! s; B3 H
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0 S G t7 g# l! } H& C+ V2 I2 m ;; initialize the global variables that hold patch agentsets% T& T4 _+ I; |, q5 u M$ n+ g
set roads patches with. G/ [2 l, N, s# e$ k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! |6 X0 B: C* k6 D/ n0 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ T7 K! u5 u; j/ C set intersections roads with
, B- f! F; c+ ^% p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: X! d1 G+ V. A# X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 Q. d5 ^/ f# B! ~; @$ H
- v4 g4 B7 k V; b ask roads [ set pcolor white ]8 |+ P/ E! r ]1 V6 ^* C
setup-intersections F; V: p9 n( z, ~4 _
end
/ @5 u& F& f$ q9 M7 T( D& d其中定义道路的句子,如下所示,是什么意思啊?2 I7 v+ ^* f+ W; @; w5 J
set roads patches with2 b7 d) ]4 n [! i4 a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! j4 ]' ^( b* m3 X0 d# e+ Z k1 v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 Y6 p7 X% C/ ?& y2 y
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? |
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