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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。
/ \# X# A( f$ e4 J$ |/ Hnetlogo自带的social science--traffic grid这一例子当中,
1 c, u _0 G( p5 ^/ Bglobals, e: D& M0 s3 s7 T
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grid-x-inc ;; the amount of patches in between two roads in the x direction
8 T$ J9 T) T' @2 o' \ grid-y-inc ;; the amount of patches in between two roads in the y direction
& n% f1 G5 |7 E7 H3 N acceleration ;; the constant that controls how much a car speeds up or slows down by if/ S; p1 `" [3 s/ B0 s$ A' ~
;; it is to accelerate or decelerate! T e& Q# J* t3 W5 s& T
phase ;; keeps track of the phase
6 J+ ^* C0 n |& S- f9 F$ n. i num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- z5 m0 b" A( u+ o4 G- j ~
current-light ;; the currently selected light
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;; patch agentsets
. w3 r& J9 s* X4 \ intersections ;; agentset containing the patches that are intersections
% W9 v( o5 R: ~, A4 f5 `( y b roads ;; agentset containing the patches that are roads
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9 N1 N4 X4 Y6 K- x1 I9 H. R0 Tturtles-own
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speed ;; the speed of the turtle
" g* S8 k. b3 }3 B: F up-car? ;; true if the turtle moves downwards and false if it moves to the right9 p y \% }: n
wait-time ;; the amount of time since the last time a turtle has moved$ f- x2 h5 Z" Q, r
]
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patches-own
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( L |, t; B* T+ c intersection? ;; true if the patch is at the intersection of two roads
! i6 r& \( l3 z0 o R green-light-up? ;; true if the green light is above the intersection. otherwise, false.+ p5 f+ p/ C4 [. G v
;; false for a non-intersection patches.( R1 _$ r$ c9 {6 Z
my-row ;; the row of the intersection counting from the upper left corner of the
: f- C% L1 R& j4 e) \# Q ;; world. -1 for non-intersection patches.
, k; P1 W! Y% x7 l) ~ my-column ;; the column of the intersection counting from the upper left corner of the
- g6 X" D$ k: d% x* p9 j) z ;; world. -1 for non-intersection patches.$ i [0 j: M$ \- ?, b# o
my-phase ;; the phase for the intersection. -1 for non-intersection patches." ~5 a L% K- Z! z1 T
auto? ;; whether or not this intersection will switch automatically.6 J* z5 ~4 g: ?1 e& F8 u
;; false for non-intersection patches.
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) A7 X6 k) q/ |% G$ `8 T" q;;;;;;;;;;;;;;;;;;;;;;
# }5 A$ V" k2 ?2 w;; Setup Procedures ;;
z. D5 k+ }$ c U1 {% w7 K* ?4 s;;;;;;;;;;;;;;;;;;;;;;3 H" g, w0 i' b* L6 R5 y! O+ e
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;; Initialize the display by giving the global and patch variables initial values.% B. g7 c S( O( n
;; Create num-cars of turtles if there are enough road patches for one turtle to
" c7 R8 e* C. Q9 E;; be created per road patch. Set up the plots.5 k, A( ?; O s& S1 g( {# S
to setup% V3 S2 f* M, k. o, }& w; s
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setup-globals% n. \$ w3 t9 J. Z$ w3 ~
" i6 I) j8 @6 R! f- B( k" K ;; First we ask the patches to draw themselves and set up a few variables, A9 Z `9 n7 `1 }
setup-patches; A& j1 H ?, G9 }. ?
make-current one-of intersections+ u; T2 }8 K( c
label-current
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/ p' L5 z1 Z# }9 [+ N6 k set-default-shape turtles "car"/ M8 p! H- D* W3 j# d# x9 G! v* Y
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if (num-cars > count roads)
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+ P5 B# p4 t, M2 Z$ A+ x user-message (word "There are too many cars for the amount of "6 m8 k7 m `( P; q/ {
"road. Either increase the amount of roads "
/ ~$ ~: ~3 A& U/ h "by increasing the GRID-SIZE-X or "8 J6 e( p3 j: i! @
"GRID-SIZE-Y sliders, or decrease the "
8 g2 G# @" q# l1 e& x "number of cars by lowering the NUMBER slider.\n"2 v% t! Y9 U' I% |4 q0 d
"The setup has stopped.")
. n4 P( c8 x A" W) K3 a7 N stop
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- M+ f1 \5 G9 H& K& y' ? ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 @: x+ z; X* \8 Z: F/ E
crt num-cars
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setup-cars
6 J6 E+ z8 l3 R: Q/ b# \ set-car-color) U4 z$ S4 t* k* V+ E
record-data
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;; give the turtles an initial speed
( u1 X o' a' z4 f4 u ask turtles [ set-car-speed ]- T5 I" q7 S6 e! L& G
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reset-ticks9 p& w+ y. \' V$ ]" J! Y/ x3 L. K& V
end5 B, K/ k. ^. `
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;; Initialize the global variables to appropriate values. h) ` y6 g0 k( ^
to setup-globals
6 ?6 s/ _# K7 S* w9 d3 y8 N set current-light nobody ;; just for now, since there are no lights yet
5 a0 |) } r$ R y# u2 A. Y3 a" ` set phase 08 L, e1 W8 @% o' g2 C3 p
set num-cars-stopped 0- K- M2 R9 T' X* U7 [ l% n
set grid-x-inc world-width / grid-size-x$ M5 I+ @1 }# P0 l' _( ?0 T
set grid-y-inc world-height / grid-size-y
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5 I3 A+ U) ]/ s- s* u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: T2 K2 `% m/ ?# y, i% `
set acceleration 0.0996 h# y8 O3 B) E7 K
end" W4 [9 O1 X% y$ ^) y2 R5 |4 c
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 {$ w& }) v' [+ |9 I: D;; and initialize the traffic lights to one setting3 \3 ~* w; o6 F9 g2 u
to setup-patches
2 B2 x s8 Q' Y$ w ;; initialize the patch-owned variables and color the patches to a base-color# Y+ D+ A& w; q8 f
ask patches
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5 r( i, g* y3 `: i5 G9 J) L set intersection? false
3 h8 o. t( \- i4 @: M set auto? false
* }) D& U3 N8 J0 c" k( y8 w set green-light-up? true
7 ?, o2 d# W/ s: x4 {% p4 v5 L set my-row -1
3 o7 w ]' a/ [4 K( z x! D set my-column -1: I0 m2 J% R' S0 Y# i( x
set my-phase -1
0 G @8 J2 g- |+ d set pcolor brown + 32 R3 l9 t7 A R
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0 x' D k; m$ V. ^ ;; initialize the global variables that hold patch agentsets
' k2 q& s9 p: w& d; K, u8 [0 r set roads patches with: N$ t4 P( J* a4 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 I- X2 X( P7 g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. `! `1 O1 ]/ @7 d1 Y. ] set intersections roads with! ~& t4 O6 g" _, `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ V+ S' V/ k8 M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 K; ~; q7 m c- w7 w t) e
& {- [$ t6 v% b% B ask roads [ set pcolor white ], a* z3 e* @8 N0 e7 R r- H
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?1 F# x6 a# i8 n/ L2 j( l- _
set roads patches with4 N& T) ]6 M8 B9 p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% `2 b. [, Z' i. S/ h2 i% r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; M) a- d2 L4 [3 {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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