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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。% q( x8 Q. {; W; _1 ~8 R
netlogo自带的social science--traffic grid这一例子当中,
& b4 n6 d2 |# C( i. V) oglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction7 V' d" C* Q* C+ m
grid-y-inc ;; the amount of patches in between two roads in the y direction
5 ]1 R W7 y$ h" \ acceleration ;; the constant that controls how much a car speeds up or slows down by if4 L. n* n4 k8 f0 J! f
;; it is to accelerate or decelerate
: D- ~" K9 `/ n% l* F/ u5 ^ phase ;; keeps track of the phase' y$ c: ^7 g* W; S6 F- O- F$ [* \+ t
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ A3 \! g9 ?/ A- l, ]6 @4 H+ E current-light ;; the currently selected light; @! `9 R4 ?( C/ r# Z6 j; R
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;; patch agentsets2 C7 ] R3 L# @: y C
intersections ;; agentset containing the patches that are intersections! C( w3 E2 q& ?
roads ;; agentset containing the patches that are roads
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turtles-own: A* {. p5 K" {$ L5 w
[
W- s I( V$ G5 P/ _0 ?6 e speed ;; the speed of the turtle0 Q+ U; ^8 C+ [
up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 w" r. {8 p- c4 F5 _4 O3 [ wait-time ;; the amount of time since the last time a turtle has moved1 W9 M# Z9 K) x! _7 u, h
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+ \1 T$ c: |: O# M: j3 T: Ipatches-own* _8 i$ X2 w/ n. N2 \6 c
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intersection? ;; true if the patch is at the intersection of two roads
' k; m* P! G! F4 P& w/ Z7 H2 w green-light-up? ;; true if the green light is above the intersection. otherwise, false.+ _1 ~: m: M4 g. h
;; false for a non-intersection patches.
& b( j2 v5 m1 p. \1 |/ m* Q3 \ my-row ;; the row of the intersection counting from the upper left corner of the
; C4 }: {4 ~: D4 z7 | ;; world. -1 for non-intersection patches.
/ }3 V0 G! d6 L$ R( a" x my-column ;; the column of the intersection counting from the upper left corner of the. p+ L4 z% c8 u: Z' j3 ?) ^7 M
;; world. -1 for non-intersection patches.
$ e6 E1 `9 L s: F7 s6 | my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 B1 i+ I b' c$ g* H auto? ;; whether or not this intersection will switch automatically.
: o" g3 r8 _6 Y3 J$ o8 @ ;; false for non-intersection patches.- M4 T( Z3 A0 R6 ~" F( L* z7 b
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;;;;;;;;;;;;;;;;;;;;;;
3 m: P1 ?& ]8 O! [;; Setup Procedures ;;1 ~; d: i! g$ G% `7 a
;;;;;;;;;;;;;;;;;;;;;;
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5 Y* m6 H( @4 E0 C! ~; s% \;; Initialize the display by giving the global and patch variables initial values.
5 l: M3 ^% y; S;; Create num-cars of turtles if there are enough road patches for one turtle to3 x) u( F- E6 ^1 D5 E! N1 O
;; be created per road patch. Set up the plots.9 `5 @. Q- o+ G
to setup% h9 J. J5 j0 k
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables% k5 G7 R& G( i
setup-patches6 ^2 w" ?* y5 x5 a
make-current one-of intersections4 O6 x/ ~/ U( A8 w! E
label-current
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- i0 O) B3 T( P set-default-shape turtles "car"
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if (num-cars > count roads)8 h$ {) m' a5 r
[
/ N# L0 u& ^& q: k. B0 Q user-message (word "There are too many cars for the amount of "
6 x( m/ J& j0 H6 G$ \3 ^% Q/ j "road. Either increase the amount of roads "5 x5 D; X5 w6 D+ E& F3 x& W# r
"by increasing the GRID-SIZE-X or ". ^& U& F9 j$ g; x- _! O" V- J9 w
"GRID-SIZE-Y sliders, or decrease the "5 r( M5 s: A) p; U3 `: l5 c
"number of cars by lowering the NUMBER slider.\n"
/ _2 r' s9 S! P! U4 [ "The setup has stopped.")
) [! w0 `. R( c stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 C5 X/ [. j+ N1 h F
crt num-cars- v/ d6 U6 }$ L/ e( i4 D& m
[
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set-car-color
/ s6 e) m5 T& B8 K. q/ Z7 H1 r record-data3 g( y4 H! \6 T9 o8 O
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;; give the turtles an initial speed& L! N! T }7 o6 n4 e3 \6 o
ask turtles [ set-car-speed ]
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/ G6 j& m; v; O! F% T8 F reset-ticks
* o5 G( J. Z$ y; x0 Pend
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;; Initialize the global variables to appropriate values# B. B4 j" P" D* f
to setup-globals
6 @: g8 \" T3 d/ `. p; M- N set current-light nobody ;; just for now, since there are no lights yet
9 c: x8 C( s3 t5 ]9 r* I set phase 01 s. ~/ v( f- @) n& T8 E( t9 Y+ w
set num-cars-stopped 0
% ~, l }# d+ s8 s. ^8 |; V5 \ set grid-x-inc world-width / grid-size-x3 T5 l, d# o- g \& s
set grid-y-inc world-height / grid-size-y
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% Q: v( v1 v) V+ ]5 u8 r' `: ?" E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- u' a$ V4 H/ R; i4 k' i
set acceleration 0.099
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6 _: f7 Z, Z. y5 g0 f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* L# N# p. T4 U/ U& p;; and initialize the traffic lights to one setting
5 p5 M* M' J8 O. ] D' Jto setup-patches5 h- c' [4 S3 K1 g. a' V
;; initialize the patch-owned variables and color the patches to a base-color( \# G5 R4 k' {3 _
ask patches2 F2 P# @. t V2 W3 H$ S8 v& f
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. h- j) ?- o& x+ k, x/ n set intersection? false* W) u8 y# }, i& M* e* e8 G8 H! a
set auto? false
9 }2 T; T5 ]7 Z* }* I( R set green-light-up? true
6 B: f; Z% i1 [. R' O set my-row -1
! d8 p$ ]6 w4 H6 @) G set my-column -1 Q1 j' @) k$ b5 s% R; L' H
set my-phase -13 ?) `/ O) t% i
set pcolor brown + 35 o( P$ I/ B/ ]+ p4 I# m0 A, ^
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;; initialize the global variables that hold patch agentsets L; x" z2 {! e8 x: s" l. Y. e
set roads patches with2 r( v/ @7 T+ e/ i% D3 {7 c9 j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 `& E6 M/ k% T2 N# ^& F. A8 T+ \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 c* c) l% r' g% f# t$ c* ~3 e set intersections roads with/ c, ]4 _; W5 ^; K+ `' s) V7 \ K# b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 R7 {4 g6 M2 K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
& \. ~% z) O9 p8 P+ @5 u! h其中定义道路的句子,如下所示,是什么意思啊?
) T, J, |( p2 `% o set roads patches with
f# V- ~2 n2 v- }# Z" K8 j/ m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# E p2 T9 @9 A2 t4 _& Z+ W# e4 v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" ]. l- i* Q! r9 p; u, H
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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