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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。
[* ^+ U& t3 l+ inetlogo自带的social science--traffic grid这一例子当中,# i: R5 A+ V4 u5 R/ d
globals
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+ G" ?0 _" f x3 u B! z0 J grid-x-inc ;; the amount of patches in between two roads in the x direction+ y& H8 S, n" D) s
grid-y-inc ;; the amount of patches in between two roads in the y direction( l6 ]$ k2 l9 l$ o
acceleration ;; the constant that controls how much a car speeds up or slows down by if5 t8 e* e1 |! b4 H+ c* O
;; it is to accelerate or decelerate/ j1 Z' c) p) f Q2 w" ]
phase ;; keeps track of the phase
$ f$ I$ b O1 {$ M7 x2 w+ r3 H num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 r& _$ r1 h2 R' V
current-light ;; the currently selected light, D$ ~+ C2 b' J
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;; patch agentsets
7 g- U6 k- l/ R1 @/ i6 W' u intersections ;; agentset containing the patches that are intersections
4 p. ^4 `1 D) w roads ;; agentset containing the patches that are roads
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turtles-own
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1 L1 [0 _4 z: c6 s1 f9 _- W" o speed ;; the speed of the turtle
* D+ z- X c2 C/ N* [ up-car? ;; true if the turtle moves downwards and false if it moves to the right6 |% a: }% r9 P: Y
wait-time ;; the amount of time since the last time a turtle has moved) w' G* }3 ^3 G4 J
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
, m$ j5 j0 a0 h: E8 b% H green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 G4 U$ ?! m' {3 O6 K* o2 ~3 @ ;; false for a non-intersection patches.
* W, H) ~6 W: a8 j" E: L my-row ;; the row of the intersection counting from the upper left corner of the
. i+ B: M: ]( @7 z ;; world. -1 for non-intersection patches.
8 S+ S2 X0 s& k: [& F* {: ? my-column ;; the column of the intersection counting from the upper left corner of the
6 ?- @) A; k. h6 P9 g6 C3 N$ t0 c ;; world. -1 for non-intersection patches." n+ g+ a" ]. S
my-phase ;; the phase for the intersection. -1 for non-intersection patches./ `4 w7 h5 l5 r$ W: M, h
auto? ;; whether or not this intersection will switch automatically.
- Z- W7 [& S/ f* u ;; false for non-intersection patches./ n1 D. r# `3 L& A
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;;;;;;;;;;;;;;;;;;;;;;
, B8 N* P5 h& y6 B ]4 S- i; v;; Setup Procedures ;;' i, q( z/ z; C- k
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. c& \% a$ c/ o* O' S6 q0 J;; Initialize the display by giving the global and patch variables initial values.8 Q3 Y. Q0 b/ f" g6 ^( _6 p3 ^- Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
* l' L# W5 C( q1 j;; be created per road patch. Set up the plots.( L" |0 |- k5 h; R: O6 p
to setup
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setup-globals$ l3 u2 u; ^* c, e
( n- n |+ ~2 e9 B% \0 k1 N& S9 \ ;; First we ask the patches to draw themselves and set up a few variables
( m: t8 s: S1 e; `. U2 c1 Q, ` setup-patches
. D* D0 D9 p9 ?* ^9 f; f make-current one-of intersections
* V0 J8 y% E5 U2 t" ^6 ? label-current
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set-default-shape turtles "car"
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1 \1 Z c) |2 _0 l6 J1 H# A if (num-cars > count roads)( v4 p5 l: Z' x! p
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user-message (word "There are too many cars for the amount of "( `6 ~! {; a/ \& Y1 v; l& j* f
"road. Either increase the amount of roads "
. ]: @9 P& X6 I' B "by increasing the GRID-SIZE-X or "4 s1 G4 C* ?4 e( f! h6 [
"GRID-SIZE-Y sliders, or decrease the "
. F4 q; G% s/ U% V "number of cars by lowering the NUMBER slider.\n"
- O+ @6 | K3 ~3 H9 \" D "The setup has stopped.")
7 e: ]# K3 O% f8 B: c/ G. [ stop
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* T+ f# Q: Z% d5 G1 c; @ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: Y: g( `, H5 ~$ E. m$ k
crt num-cars6 r# ~4 I4 _+ z6 B& y
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setup-cars% }! ~4 ~+ d$ t% ~
set-car-color9 P! C3 b2 K! U I
record-data* p3 s' A9 `2 C! O
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8 @: w8 Y* a2 s3 j1 ` ;; give the turtles an initial speed
5 {; b( u+ J9 M4 w4 t8 m ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values o' u) r6 c: `% Y" ]# s
to setup-globals2 f4 r; }: v' w
set current-light nobody ;; just for now, since there are no lights yet; D0 u" E/ [, M; O7 u
set phase 02 Z! E' W( T) N- u( |
set num-cars-stopped 00 |8 j0 o( U3 |, R. Z
set grid-x-inc world-width / grid-size-x4 B) x( `. [$ l W
set grid-y-inc world-height / grid-size-y* z8 R$ p+ ?+ F! I) h2 E
0 c/ t' s6 Q" c% r: f& U ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* P# s5 L7 p; q/ t9 s4 J' p( F set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,! j/ S4 a! U8 q; w: Z
;; and initialize the traffic lights to one setting
4 Y+ W y" e& i) dto setup-patches1 U* u: K! @* `5 `. c
;; initialize the patch-owned variables and color the patches to a base-color* Q% \1 Z/ W5 Z3 @1 Z6 a; [
ask patches9 d" R8 e9 `' p0 M
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set intersection? false1 M/ T* |! x4 |7 k* w
set auto? false
& f5 C5 @/ c+ _ set green-light-up? true
x% U* V8 v; G set my-row -1& D, B2 ?3 q: R- O# T! e
set my-column -1& ?0 o- {- S% V% k* h
set my-phase -1* z2 f" W4 x# U+ D9 ~! g
set pcolor brown + 3/ |# i( h. s5 ~* H2 j5 a6 j
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;; initialize the global variables that hold patch agentsets
& A: l: Y+ n' x0 t7 o6 w set roads patches with" ~7 `/ ~7 m F6 z) P, {- U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, U% r D4 W! o! F2 Y! P* ~# @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
X$ a9 E2 z0 @7 ~0 C$ r u) N# v; j set intersections roads with
" x. N: W! {& \' O0 Q3 w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% F; g% p4 |9 j0 a+ x4 [: V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# x, }' z* M; M" ?1 E
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ask roads [ set pcolor white ]
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end i$ M$ Y7 j; E
其中定义道路的句子,如下所示,是什么意思啊?8 ^* g4 P R; C4 {, X( O: S
set roads patches with3 h$ e9 _; e2 I5 Y1 w4 Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ R/ B/ y/ E, W0 b- A5 k+ ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( E" t; I- N, r$ O3 l
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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