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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。9 `5 ^% Y/ j% t. f$ O; |4 b
netlogo自带的social science--traffic grid这一例子当中,# F7 g& F7 l9 e
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction! L) B4 u( J9 Q- D# I
grid-y-inc ;; the amount of patches in between two roads in the y direction3 c; G) k2 O# {+ z) H3 S
acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 m" o# S" {% S) T7 _" n8 l ;; it is to accelerate or decelerate/ u% Y& n$ \* \" s! a
phase ;; keeps track of the phase9 X7 l E6 h! p
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ P* o C3 n& f1 N9 d2 [5 i5 W' U
current-light ;; the currently selected light( f& ~! ]/ M- g; J4 Z
( r& O% b. r2 ~9 H) q ;; patch agentsets' m/ ?" V" T3 r" V: Y
intersections ;; agentset containing the patches that are intersections) d. ?% v* l8 E. D" C+ w" V
roads ;; agentset containing the patches that are roads3 e! t( k+ R G4 W6 U: e9 d7 F' A
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, k3 l* I7 q L" pturtles-own
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- Q% {, Z: p; z, g3 [3 K2 U- _ speed ;; the speed of the turtle4 D1 U: v. m1 o8 s# n3 {
up-car? ;; true if the turtle moves downwards and false if it moves to the right
Z( A$ g U0 `6 q wait-time ;; the amount of time since the last time a turtle has moved- v) [5 b" }/ x1 N( @
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" `4 A6 [6 c* D! D8 cpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
; ~4 Z. P G2 O green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 S. y" t5 O+ ]9 K" T' i
;; false for a non-intersection patches.
$ p& N+ B5 a! p h2 [ my-row ;; the row of the intersection counting from the upper left corner of the4 K" D6 U0 D0 T3 o( R+ Y( j
;; world. -1 for non-intersection patches.4 ?; B0 U/ S8 a7 ^# @$ }/ w
my-column ;; the column of the intersection counting from the upper left corner of the
8 r% r7 V- A+ _! {9 F ;; world. -1 for non-intersection patches.
3 u) T( \' N$ M3 e my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 Y# `* n( c4 F6 K+ \
auto? ;; whether or not this intersection will switch automatically.
+ O' I5 g P+ g4 ?$ q9 Q5 k8 ?9 x ;; false for non-intersection patches.- ~ A4 O8 M, l
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0 h$ R- \9 t% ^# h;;;;;;;;;;;;;;;;;;;;;;
[1 C& o/ p- s;; Setup Procedures ;;& _0 y% K1 H2 |4 L
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
4 b5 A" Y# A# s# F;; Create num-cars of turtles if there are enough road patches for one turtle to/ f# t! [- l9 W1 @$ \, n4 p
;; be created per road patch. Set up the plots.
! u% w2 D$ I0 F$ a& O2 b. v1 N+ eto setup' t7 A1 l0 k! i9 g! B% W% O0 s
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setup-globals3 l4 V; t/ R5 u4 P( }3 F
1 O3 b$ @. a, n ;; First we ask the patches to draw themselves and set up a few variables4 p5 d. Q) m) x4 i( _( ^
setup-patches
4 e$ F s& Q& |" @" {: Z make-current one-of intersections( w" x* h7 S9 {8 Q) @1 k
label-current6 x2 q ]+ @" z3 c) F) ?
! ~8 R U- ]" @- ^- q( p* u set-default-shape turtles "car"; f* ?( q% k0 w* p$ C
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if (num-cars > count roads)" `5 A# i" z0 a# y. l o7 C
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user-message (word "There are too many cars for the amount of "( j# Z g, N' M5 O5 e! q
"road. Either increase the amount of roads "4 L) P; c4 o& x. B2 n6 N; {% @
"by increasing the GRID-SIZE-X or "
/ j# G h; t- }! h" @2 e "GRID-SIZE-Y sliders, or decrease the "
9 U1 k* W9 ]& _! q# v9 g( O; Y "number of cars by lowering the NUMBER slider.\n"$ B- _- t# }. O3 l* q' G) c
"The setup has stopped.")7 l* Y0 |6 ]. h; {5 E4 f
stop: R$ O1 z2 _- p: a8 G* S
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% Z7 i3 M& W! _9 |; B1 i ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% G& k( m1 i- [8 n' q e
crt num-cars
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setup-cars
4 ]" _; ?8 g# _; | \ set-car-color3 k* v2 i( W$ R9 {7 l
record-data
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;; give the turtles an initial speed
/ l" t: b6 g/ _: \/ S z ask turtles [ set-car-speed ]
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7 L9 G6 A: u; A reset-ticks
8 C* }# W) c) ?end& n9 S! h4 l7 A1 C& L
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;; Initialize the global variables to appropriate values
+ j5 u0 n' b6 _# y* b6 @" h" z. ^to setup-globals# _: W: n- ]% n7 @( O+ V
set current-light nobody ;; just for now, since there are no lights yet& W* @+ q' ]3 b: \' W& W7 l
set phase 0
g$ k! _% G. B6 u+ x6 W* K3 N" `- q set num-cars-stopped 02 b/ v |2 j: h" V
set grid-x-inc world-width / grid-size-x
* |' @4 n8 \" Y/ G+ q4 U9 ]9 m 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' I' d1 }. y+ d, C1 H
set acceleration 0.099) d! h, I! t' S, U& D
end( f- d6 q& _+ i0 c+ A( r) ~" [
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* j7 k4 K6 V v* l6 O* ~6 b;; and initialize the traffic lights to one setting
0 M1 ^4 d. t: j- `& q& {9 v# bto setup-patches
7 M/ o! X8 ]0 H8 D7 P ;; initialize the patch-owned variables and color the patches to a base-color4 k6 u z# n& V) E& P4 W
ask patches) l( _4 ?6 b* g! U% h
[
3 l S n2 ~) |6 C set intersection? false
. y J* H0 t* r$ l' P set auto? false4 ^3 N$ @) `! \2 h8 N! g4 E7 L
set green-light-up? true% }8 _7 D3 N, G
set my-row -1
! \' A& E, e# g2 i6 D0 A set my-column -1/ ]0 W& c$ P* y/ k# g" Z' T
set my-phase -1- W5 Z7 @ [2 ~7 r0 w2 ?, k
set pcolor brown + 3( l7 u% D: U6 s2 @
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;; initialize the global variables that hold patch agentsets
7 Z( M4 l! j* A' | set roads patches with5 [; d/ |/ ^$ {9 Q q/ x8 r5 A5 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 [3 A; S% Z8 p9 } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* P. {& }* Y* ^' r9 l
set intersections roads with. A. p5 C' w! V2 b# v e7 ~) X. h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, W! g8 e1 h1 V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! ^9 k8 y% R: c9 v& j, b ask roads [ set pcolor white ]0 m5 r7 f" |4 u$ l
setup-intersections
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. z) n3 f, T0 a( E& e. m4 S其中定义道路的句子,如下所示,是什么意思啊?# B1 L/ A! T1 N
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 a1 a& W6 D/ A. a! M. s/ a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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