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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。
% I& @; c+ I. w& }' `% Bnetlogo自带的social science--traffic grid这一例子当中,
& o' [0 n1 x* d% b* Cglobals
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5 l f, k9 w6 Y* L grid-x-inc ;; the amount of patches in between two roads in the x direction
" ^1 w$ ]1 ?8 d8 V% [3 p grid-y-inc ;; the amount of patches in between two roads in the y direction! S% A6 ~5 ~. o1 d# W
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ n5 S7 H7 W E
;; it is to accelerate or decelerate
1 t- G S/ }( `: Y5 A7 f phase ;; keeps track of the phase3 G/ i) P( d. |% |3 l) g
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ ]# S: k8 m- R6 M3 g0 @6 E, X' d current-light ;; the currently selected light
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& s* c) n3 r+ ~5 v. R& D8 \ ;; patch agentsets. L/ V s1 i# H: W' r4 C
intersections ;; agentset containing the patches that are intersections) q( r- ~, G0 B& _+ l# U
roads ;; agentset containing the patches that are roads
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3 w+ L& ?# e! X1 O% i& y ?: g6 |turtles-own
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speed ;; the speed of the turtle
5 h/ V& P4 S6 l$ X" V% y& M up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ c8 ^6 L( }: y5 Y. C+ |: j wait-time ;; the amount of time since the last time a turtle has moved3 r6 N" q5 g7 a& e
]
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8 r' @9 F. o5 u3 E2 }patches-own
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intersection? ;; true if the patch is at the intersection of two roads3 }: J* @7 I; g( V7 p$ v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) q- E. u6 Z) L5 D8 K6 H1 Z
;; false for a non-intersection patches.$ n; ? w) B# e' b5 Q
my-row ;; the row of the intersection counting from the upper left corner of the
9 C! `# W: j. }0 E W ;; world. -1 for non-intersection patches.
! l. |2 l8 u; j# J: m$ F2 U! R1 } my-column ;; the column of the intersection counting from the upper left corner of the
1 {* N5 l* Q1 ?. m ;; world. -1 for non-intersection patches.
* k5 L7 o7 A- ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 \5 s+ h$ ^: j auto? ;; whether or not this intersection will switch automatically./ D2 h0 I( l$ \$ b7 \- f/ x* N4 L
;; false for non-intersection patches.3 J& l3 Z2 | P- Y1 H
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;;;;;;;;;;;;;;;;;;;;;;
/ ~" O5 ~( Q9 G |) G" ?;; Setup Procedures ;;! r- P* E% a1 x) u
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7 x) @$ ~) }- K# A;; Initialize the display by giving the global and patch variables initial values.
5 s$ {! F/ e% d: {% \;; Create num-cars of turtles if there are enough road patches for one turtle to) l$ I1 _- U" p8 q3 t
;; be created per road patch. Set up the plots.
' P2 M' R, R% k6 p. Xto setup! m0 o5 y6 s" e
ca
. ?' y5 f* [& n7 _# q T8 ? setup-globals
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2 t$ b/ K, _6 {% ~- f) E% l ;; First we ask the patches to draw themselves and set up a few variables- A0 ?" ]+ @7 ?1 }0 z
setup-patches
6 o. P" ]0 W9 k make-current one-of intersections
3 N, u$ T2 r c6 w, q label-current
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, ]& j: n, A$ g9 ~ set-default-shape turtles "car"2 q3 g: R1 n$ C
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
/ N! L" U$ X9 b/ C- T7 ^& g" L "road. Either increase the amount of roads "# s, H: O) y! s* k2 r5 o8 n/ C
"by increasing the GRID-SIZE-X or ". b, e$ e9 m# S
"GRID-SIZE-Y sliders, or decrease the "5 x l. a1 P2 g1 d0 |% H
"number of cars by lowering the NUMBER slider.\n"7 T) `/ N; g( z& y' B$ }
"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
" ^, N3 l) p4 A2 T/ u: a4 L8 r M0 } crt num-cars
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1 x6 a+ g& x7 Y3 l; T( C* N setup-cars
W4 ^, W1 x% a3 @ set-car-color2 f' o% V" D) ]( S
record-data7 C2 z: Y `5 ?# i
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- Y) f9 t* g5 e* C' s- T& }! q ;; give the turtles an initial speed
) s7 e- A! n% s0 Y9 ~, ^. ~6 ? ask turtles [ set-car-speed ]
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reset-ticks2 r) }3 W. _) S; T4 y' h, S. ~
end
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' T. f& ^1 Z1 f$ i;; Initialize the global variables to appropriate values
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" |6 l6 U- J$ C2 G4 b7 o set current-light nobody ;; just for now, since there are no lights yet
) Z2 _( H! _0 t5 E x" i set phase 07 N; o$ }% v% V" s( c3 }4 g1 i
set num-cars-stopped 0
% V. J/ u1 ]/ j% g4 P8 [5 w0 p set grid-x-inc world-width / grid-size-x
* R& k3 n/ P! w# d5 [ 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 boundary
$ y* e& n/ q7 _* b& U) q8 S set acceleration 0.099
! [6 L( l( G" r/ U, N" fend
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N' C! W( N0 n: V% Y: a# ?;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ }' H4 R' Y: o. k9 s) j;; and initialize the traffic lights to one setting
6 J8 C. D% B; \* p7 _8 h$ nto setup-patches; ]! y' J5 u, n! Y
;; initialize the patch-owned variables and color the patches to a base-color" l7 h" _! C2 q' E" E8 | p5 T" h' O# d
ask patches7 T3 Y, O4 u. ~+ E! _9 r3 h
[
8 _% F' A$ u9 m; i, ] set intersection? false2 p+ c5 U9 O1 N( N& ?" ?9 W* K
set auto? false
+ G: E+ x% [& [* X* A' d+ q set green-light-up? true
7 ` _& h4 C* g7 ` set my-row -1
@% @7 E0 l( x$ y; ]/ \ set my-column -10 X3 e/ o6 c3 x U) J- ]$ U( y
set my-phase -1# z) W+ |, q* R3 d
set pcolor brown + 3
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" r/ f7 |! _; [ ;; initialize the global variables that hold patch agentsets
5 t3 V6 R/ B/ E8 q, v0 f set roads patches with( a7 q* ?7 D9 ?' Z2 G( y: S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: u/ |' \6 B; ^5 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) E* s' j6 l* T+ _0 \ set intersections roads with
( S3 }$ [2 |* `$ o7 z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 Y3 d5 `7 N2 j! D$ Z5 `* k; N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! B$ ^3 R4 d$ `9 f1 ]
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ask roads [ set pcolor white ]8 S$ w0 O3 i% j* M& Y( U$ z2 K& w
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?; k7 C: z# P1 `" H7 k7 x" e! }
set roads patches with* w) g- u2 [' P! k& r0 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 q) B1 r0 O2 u+ H) J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* V4 G* X7 I" c: L! E _% 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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