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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。
8 J" w( \6 U& u% H0 s+ f& ^/ [netlogo自带的social science--traffic grid这一例子当中,
. W' M. Y6 a% Y8 q9 g7 C& v- U& Zglobals Z# E0 `6 @9 C0 i
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grid-x-inc ;; the amount of patches in between two roads in the x direction
7 I* N" F9 L5 X# U- _& j grid-y-inc ;; the amount of patches in between two roads in the y direction
+ @+ ?, T8 l% N7 k7 q. i# w0 |( v acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 @% V8 z9 K/ [, t+ }& P* p3 j ;; it is to accelerate or decelerate- a8 ? b8 F& @$ Q/ ?
phase ;; keeps track of the phase
+ Y" F# O! `7 ?5 O$ g num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
' @5 R5 D4 l) Z% z4 f# W' L& T. M current-light ;; the currently selected light
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" \+ O& K) N9 Z2 S( ` ;; patch agentsets! U J( ?1 \8 Q0 U9 M
intersections ;; agentset containing the patches that are intersections
. s/ Z$ m$ I6 |! Z" e roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
7 G/ v( \" _# \" I+ L/ f up-car? ;; true if the turtle moves downwards and false if it moves to the right% F3 k9 V# [! Q* ^
wait-time ;; the amount of time since the last time a turtle has moved. y5 @" g0 }: m5 F* u! |
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
* t5 f }0 J! {8 N9 d green-light-up? ;; true if the green light is above the intersection. otherwise, false.# p# {2 e U6 ?
;; false for a non-intersection patches.' R' r2 X* I: J8 E: I6 U6 H3 _
my-row ;; the row of the intersection counting from the upper left corner of the/ V6 p' K! ?. R- S
;; world. -1 for non-intersection patches., x7 I2 C/ }; l) J" F+ Z
my-column ;; the column of the intersection counting from the upper left corner of the( `: ]0 X& H/ {' Y# x3 J
;; world. -1 for non-intersection patches.' ?3 Q+ r7 g& a0 Q* H
my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 Y3 W# F/ c9 Z, Z
auto? ;; whether or not this intersection will switch automatically.
5 S5 Q1 v! i% f ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
$ p) \/ V) s; P8 N( q0 @5 b7 L5 p( c;; Setup Procedures ;;6 @' C3 v: p0 l! d
;;;;;;;;;;;;;;;;;;;;;;" N. f! T4 q( ?9 T/ {- K
* x9 m" l* V% D, U;; Initialize the display by giving the global and patch variables initial values.# U' P' G$ z- `: v
;; Create num-cars of turtles if there are enough road patches for one turtle to
' ?( {+ P' @+ ]8 h& C% `* X;; be created per road patch. Set up the plots.
; D/ ~! z4 r" B! ]/ ~0 }0 b4 |to setup/ ^# p. y+ ^$ O8 J
ca
- h8 ^6 B0 z% W+ J setup-globals
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' w3 N3 m/ ~4 r ;; First we ask the patches to draw themselves and set up a few variables: m5 T1 q n0 c B5 k( u
setup-patches6 Q( T- E# @& ^8 I/ t
make-current one-of intersections4 z' v& G E$ S4 K, M
label-current
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set-default-shape turtles "car"
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; A- _2 Y Y9 f1 x if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
: T3 l: ^( K: c. J# l$ S7 { "road. Either increase the amount of roads "/ G1 Q! x& I2 R% l. j
"by increasing the GRID-SIZE-X or "1 @1 S/ R+ |! J
"GRID-SIZE-Y sliders, or decrease the "
5 f3 @% [/ W; h "number of cars by lowering the NUMBER slider.\n"- m- `& y# f$ m; ? d9 V
"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+ |: O1 Y1 N- a9 [% X8 F1 A, r
crt num-cars4 w* O. A$ |1 k* R7 P. `+ x
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setup-cars
- y7 T8 E* _* Y8 n7 Z set-car-color( z& ?8 b N5 `1 J5 _7 N9 t
record-data
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- C, v8 D( t2 Q% Q2 R. X ;; give the turtles an initial speed% x+ s. { U! G% x2 z# Z; q6 Z( Z
ask turtles [ set-car-speed ]% K' l, P' h( f# U0 L2 T1 Z
1 L# X! D; j9 z7 z0 O reset-ticks
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet( @0 D: k ^! w: H1 j: Q
set phase 07 j" g9 R6 S- p1 ^4 }! I- `1 n( M
set num-cars-stopped 0+ K9 P7 a _$ E& [" U
set grid-x-inc world-width / grid-size-x
) \$ V' \$ h: D/ f+ Q- @ 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$ h9 z& h) b: T- X0 p7 R3 j. R1 j
set acceleration 0.099
/ P2 S+ s* X& ^# v4 [end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# g4 Q# d7 i: P" @( q" ?- K
;; and initialize the traffic lights to one setting5 k+ s( y! k& u' d# X0 A# J Z
to setup-patches9 r7 f- } w1 R0 F) W( p6 J3 p5 U% ~
;; initialize the patch-owned variables and color the patches to a base-color
/ N, [8 |8 O7 I3 p9 H ask patches+ r0 n1 [* f c! G! V k4 V8 L
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1 G$ F, V' j4 R' S% f! ] set intersection? false/ |+ i0 S8 \0 h" t2 ~: h+ A/ c! c
set auto? false& }0 q" L/ A# i9 H
set green-light-up? true! K0 I; V5 z. l7 g* U) o/ H$ |
set my-row -14 k0 O: Z* @8 s
set my-column -1
! B1 s4 |( p" n set my-phase -1& D" F4 m3 u. c& g8 @0 k% A
set pcolor brown + 3! l9 F# D% `5 y8 K" q+ K$ k
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;; initialize the global variables that hold patch agentsets4 G0 E5 P. O" @% m F8 }6 e
set roads patches with& q% d8 A6 \5 ~- l/ M0 ^/ B4 P) s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) \- k5 G7 \2 T3 U1 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
J6 E; ]" V U! ]! J4 P set intersections roads with
9 @) m2 v: p. `1 [/ I3 w6 U. z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& ~$ N- }7 y$ W/ N8 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]5 ]- H5 H/ {; p* o# F
setup-intersections9 N3 }+ F! O% h8 a( l% y8 {1 T3 y
end
: ~" w. N" H) C其中定义道路的句子,如下所示,是什么意思啊?. K$ d2 K9 m; ?8 a9 G
set roads patches with
4 x1 N0 C. w5 Y6 A/ D: q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or W `' M& ?: K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 ~5 L9 r& v% J' ] c% j6 M
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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