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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。4 x W+ i' I" U. H
netlogo自带的social science--traffic grid这一例子当中,0 G: k7 X* M/ d0 y3 L
globals( N: G' L" c8 |. ]( A6 p4 _6 r
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. i7 q# I2 V# P S grid-x-inc ;; the amount of patches in between two roads in the x direction
# P1 F2 j, E" O& K5 M$ V% } grid-y-inc ;; the amount of patches in between two roads in the y direction6 X/ G3 K+ u, {4 y& N8 Z) h
acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 F/ ?7 k) ?" r) R ;; it is to accelerate or decelerate
/ m; C u) B' l' G phase ;; keeps track of the phase
* x3 ^7 V5 z K6 s num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% ~% p- T7 r( Q2 ]
current-light ;; the currently selected light/ v5 d, P+ y* q6 m
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;; patch agentsets
5 x U4 b5 a# z y intersections ;; agentset containing the patches that are intersections/ E- A- M7 m" e% B
roads ;; agentset containing the patches that are roads
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8 @; T7 f5 |3 J2 I. Uturtles-own: V& N' R4 k1 D7 X
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speed ;; the speed of the turtle
- v' ?) l. ?. h" N up-car? ;; true if the turtle moves downwards and false if it moves to the right7 I! @; }# M1 G/ Y( V
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own2 i% |! l. L$ `$ c; c Y6 O
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intersection? ;; true if the patch is at the intersection of two roads: O( d% h a* S4 ]! M9 Y% Y
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 `2 h) W7 O: F/ M1 @6 y+ }" r
;; false for a non-intersection patches.
1 [* ]' @( c# M& d my-row ;; the row of the intersection counting from the upper left corner of the0 a# h1 P3 K2 n
;; world. -1 for non-intersection patches.
; ~4 E2 n. O9 J' M% f2 t4 \- N* B my-column ;; the column of the intersection counting from the upper left corner of the D5 M) H6 N' Y+ R1 h0 N
;; world. -1 for non-intersection patches.5 w7 N- K: X- j- [
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( h6 |! b; q8 P$ r- R5 s5 Z4 m auto? ;; whether or not this intersection will switch automatically.
& R1 C: S& O0 a5 N$ j/ t/ ~/ S ;; false for non-intersection patches.
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& t5 v& G1 u, K7 w/ c. \;;;;;;;;;;;;;;;;;;;;;;
( T3 A5 ?4 u' _" C0 [0 b;; Setup Procedures ;;
' R9 v& l5 A+ C+ B5 Z1 C6 };;;;;;;;;;;;;;;;;;;;;;
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; F) h% ^$ _3 Z X3 h9 r;; Initialize the display by giving the global and patch variables initial values.
0 ]- ^' Y. m6 s6 ]: Y4 I;; Create num-cars of turtles if there are enough road patches for one turtle to7 B; m Q# s7 y' z$ h; w# p
;; be created per road patch. Set up the plots.0 W* T. `$ w: i; M6 k
to setup
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( I! ^2 y& d/ t ~" H- Z setup-globals' \, f! y: J$ b# |/ c, r( W
- \$ }' `4 r! C+ v' a1 { ;; First we ask the patches to draw themselves and set up a few variables
8 N+ U3 P$ C6 R8 J8 E6 F setup-patches
: v9 m$ Y. U# s& F& Q; a: |8 z0 D8 P make-current one-of intersections" e3 p1 O* O& ^' x# K
label-current
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7 @8 c% Q& ^" _" \0 C; \- w set-default-shape turtles "car"; e! B! h) Y& R
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if (num-cars > count roads)1 _6 ]4 Q( m6 P1 m& G
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user-message (word "There are too many cars for the amount of "' Y- n% f+ C. S0 N
"road. Either increase the amount of roads "
" @" @5 n0 x* C! A. m k "by increasing the GRID-SIZE-X or "
% d. B A( c% ^" g5 I( T4 f; K "GRID-SIZE-Y sliders, or decrease the "4 H5 J' F/ q( |# n' N' W, E; U
"number of cars by lowering the NUMBER slider.\n"
% F7 s: ?) `, \# ?$ q* o "The setup has stopped.")% ^# R; B) u, r0 p2 q% }, O# F
stop- n3 M; j6 `9 c9 u. V/ I
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: t% g+ b1 s' }# v# n
crt num-cars
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setup-cars
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record-data2 P* a* x# l/ O) { R
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+ S/ l; O1 t9 ]% k r+ K, o/ I" a7 n ;; give the turtles an initial speed
' N" x, j6 p& e ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values. f( p% d' @# G6 z {; H4 b
to setup-globals1 e" D& u# s4 Y. T$ o3 k+ U4 E
set current-light nobody ;; just for now, since there are no lights yet
+ A3 M7 b* t( @6 x- v6 a! l set phase 0
( o3 g6 u0 K2 j6 \1 x set num-cars-stopped 09 N9 M4 W8 r- g4 |. @
set grid-x-inc world-width / grid-size-x
, C9 T K3 c: G4 J8 E set grid-y-inc world-height / grid-size-y
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1 ^3 m5 `: a' {2 _ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 k. H+ m( b' ~/ I; k( {8 }
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 V/ T: T* f7 K% i;; and initialize the traffic lights to one setting
% @) T- g: S- M/ P, M+ J! `& rto setup-patches
+ C6 I5 u: a- o5 L( @ h5 G: P1 C ;; initialize the patch-owned variables and color the patches to a base-color
7 @: B1 N. T' Y) Q7 {+ d: p ask patches# A+ n! d! o: P1 E3 C# q
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set intersection? false
1 q6 U( \( a9 v0 w# J set auto? false y$ c& f+ l' m6 n }
set green-light-up? true
4 ?% E3 ]: c4 ~: Z5 k% x2 \ M set my-row -1 q% U7 U' [2 l
set my-column -18 c% u. C# e( p8 Q6 a/ o* ]
set my-phase -1
5 u' L2 U- a7 H8 U/ K set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
8 n1 X O, D2 P# W set roads patches with. h, w$ c0 z8 V: s7 t. e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! V" m0 c: C$ t& }: x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' D9 o T8 x: S* z& M1 ^- p set intersections roads with
# x2 n6 C" T5 j H3 c6 r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 D/ q& \* W3 c' O, i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]( Y# h' ?5 M& m
setup-intersections# b1 b: l# F, I; Z( L" H
end
' m% @ [( Y0 H ?3 o5 x, m! _! f其中定义道路的句子,如下所示,是什么意思啊?
% B) X; e% k) A set roads patches with* G( b( [( o! C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 u+ {( a% h8 f5 e! \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 ~. Z7 p' r6 x. T& H( q; H- f
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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