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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。 t5 [: ?8 f l* R
netlogo自带的social science--traffic grid这一例子当中,
) x( z$ G/ s3 C/ I+ }globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' ?9 z) O( L6 n! N8 Y1 I3 D grid-y-inc ;; the amount of patches in between two roads in the y direction: ^9 l) D) ^! y9 P1 ~6 J4 C/ Z
acceleration ;; the constant that controls how much a car speeds up or slows down by if( q& K5 x- s3 l: F
;; it is to accelerate or decelerate
+ @- e6 [' d+ D" n phase ;; keeps track of the phase, |: ?4 }( z! n
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 P; a* ? E9 J4 Y$ e0 z
current-light ;; the currently selected light
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1 `% @ v* k* M# d ;; patch agentsets
! z9 |3 k) ? b8 C intersections ;; agentset containing the patches that are intersections
1 W ]; |" c# F% q. I; E roads ;; agentset containing the patches that are roads
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turtles-own ^& V( _! {! O# _$ R( P
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speed ;; the speed of the turtle) o* @6 _. E/ [' }* E+ k( |
up-car? ;; true if the turtle moves downwards and false if it moves to the right: E7 T: P3 z# O1 u3 I) p
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads! q( i0 v. r6 }/ G7 J
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
m: X1 J$ m" P. N. d" W% ~ ;; false for a non-intersection patches.
2 @+ q, J4 }! A6 m! U9 r my-row ;; the row of the intersection counting from the upper left corner of the: s# b# w6 v* j5 L# v1 g: ?* q" B4 L
;; world. -1 for non-intersection patches.' C1 z7 B. p) ?7 p
my-column ;; the column of the intersection counting from the upper left corner of the" a+ }- Z' c3 {6 V, k: |* j% N" a
;; world. -1 for non-intersection patches.
5 V4 x( b8 }* |5 `' U6 M, V my-phase ;; the phase for the intersection. -1 for non-intersection patches.
G3 N9 s1 g6 q& L auto? ;; whether or not this intersection will switch automatically.
; O5 [. _" M7 ~! A ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
, V; C' @2 J( ? n" o; N: a1 g7 x4 ];; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
" O9 Q/ h i- V6 l! [! x& _- j;; Create num-cars of turtles if there are enough road patches for one turtle to
* w0 B* E4 z: Z& y0 }7 D;; be created per road patch. Set up the plots.
. r! E& q: w! [* Gto setup
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setup-globals
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1 o! W2 W, e5 I0 G( n1 n4 l ;; First we ask the patches to draw themselves and set up a few variables
6 [5 I0 ^! g4 s setup-patches; \/ N0 |% Z! |. m9 T! G
make-current one-of intersections
. T2 f: K" s' l# H label-current
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; g$ U2 E3 Z i# H& V: b" |4 A set-default-shape turtles "car"; v! k5 V/ _, z; M
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if (num-cars > count roads)
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0 K2 M+ ~/ K- i, ~ user-message (word "There are too many cars for the amount of "
2 I+ @: D3 w- ~( A8 W "road. Either increase the amount of roads "
& G1 I7 l l" K "by increasing the GRID-SIZE-X or "
# w1 S8 m: f, ^; b( \ "GRID-SIZE-Y sliders, or decrease the ": L. b t/ z# V3 ~) p2 M9 p! Z
"number of cars by lowering the NUMBER slider.\n"
b( v4 W( M& l% r. Z/ C, V% m "The setup has stopped.")
7 f4 b$ l: {6 W: W! E stop! f* r( G6 J8 E1 x6 v- U
]
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! t/ D. S6 T. L# T+ W ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 d* [6 s {% L! j crt num-cars
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$ ~9 }% u3 V0 }1 N$ D setup-cars
% g! \. Z# N0 q, o7 c+ f. u' t set-car-color
/ T5 | E3 x( l; d record-data, ?1 M# {0 Z" f) ^+ p
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;; give the turtles an initial speed3 `3 a0 x6 t4 U2 P; u4 o
ask turtles [ set-car-speed ]7 f8 X5 O' M' |. p/ A6 l
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reset-ticks b. e6 D* m( D3 X1 W6 ~
end
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;; Initialize the global variables to appropriate values
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! a9 I- W$ q" u( b6 h set current-light nobody ;; just for now, since there are no lights yet, x8 {4 O/ w7 a2 N, r, K6 F
set phase 03 n: q# B# O6 `* Z4 t+ B. W3 ?. o
set num-cars-stopped 0, d X: l% h: [' |$ E% i5 E
set grid-x-inc world-width / grid-size-x
7 X9 ~5 P8 f4 H' g+ t set grid-y-inc world-height / grid-size-y2 c/ o2 b4 s( _+ O2 w9 |- w$ o* T# }& u; p
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( w' s2 [! V" o' {
set acceleration 0.099' C) ]$ G* d' E, j
end
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% J3 V6 v' |8 W4 r2 c- Y4 {2 V. Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ S$ c9 c8 s0 h w/ G8 o' ];; and initialize the traffic lights to one setting& E( [2 y b4 V# G5 P1 e
to setup-patches
& Q% Q# y% i- l- W( s! C ;; initialize the patch-owned variables and color the patches to a base-color$ M, ~' I! H$ z% X6 w+ i5 l
ask patches
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0 a# b* \& b# w X set intersection? false
/ n& l; M0 M- ]# q& |" s0 W set auto? false
6 \6 x6 k5 o' J7 K$ }: {! I set green-light-up? true+ D; C3 F" t, _& V! ?: Y
set my-row -1
: h8 ?% b ^/ o% Y0 { set my-column -14 C8 w$ a& U4 I3 z: t% r- j$ q9 C3 ~
set my-phase -1# @3 k" n2 @+ ]- o" S
set pcolor brown + 3
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* i9 {" E/ f T8 G& ?; N ;; initialize the global variables that hold patch agentsets
+ J) K" f+ q5 [$ ? set roads patches with
3 P, t) O! c" E7 H* I. Y# l& y% ~& y( z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& N! T. q- k+ Q' @' K' ^- w8 @
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% g9 i; w. n8 t$ a: c) e, u+ b
set intersections roads with' `: |+ _4 }0 u4 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& |8 d1 }6 u6 ?2 f1 w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
" p6 o$ i3 [8 g- Q# q, s) S- Y其中定义道路的句子,如下所示,是什么意思啊?# I4 v7 `; G' B) o
set roads patches with9 \3 U+ N5 K" s& {2 i* J% q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, V- V( X9 E: W' @
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# V: _- |# e# G9 t
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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