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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。
) ]+ m. {( h# T: a; tnetlogo自带的social science--traffic grid这一例子当中,, N4 y$ s8 x3 `7 [3 i
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
6 L5 `$ O8 w4 _! |, l6 s3 X D( j grid-y-inc ;; the amount of patches in between two roads in the y direction' r* q7 q9 k8 [ D
acceleration ;; the constant that controls how much a car speeds up or slows down by if
- u" O6 w" ~: H( E- X9 q1 D ;; it is to accelerate or decelerate* s& f& E+ y0 b" J9 H
phase ;; keeps track of the phase
- W3 d8 |; B, Q; s5 Y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* w$ V7 K+ x8 p4 k
current-light ;; the currently selected light
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7 g4 u( K. k& @# i ;; patch agentsets( N8 Q+ f% c7 Y# s
intersections ;; agentset containing the patches that are intersections
1 x1 m9 F+ B3 a0 C* `3 F5 r roads ;; agentset containing the patches that are roads
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turtles-own
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8 L8 Y& Q7 Y' h speed ;; the speed of the turtle
$ i8 C/ } z6 ` up-car? ;; true if the turtle moves downwards and false if it moves to the right
! u9 t* D0 P2 w" R wait-time ;; the amount of time since the last time a turtle has moved* V, N3 m$ x) N" ~' b
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patches-own
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! j: X# M# R# v* h intersection? ;; true if the patch is at the intersection of two roads
/ s" [1 h, I$ b- U! b3 P# e2 o3 t# Q green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 f/ u$ h5 \$ q& g$ t( I" c$ g' M% e. A
;; false for a non-intersection patches.- h7 c6 I8 F$ ^, z$ Z
my-row ;; the row of the intersection counting from the upper left corner of the0 C) s# s+ w3 t3 m" A4 Z
;; world. -1 for non-intersection patches.$ R/ h7 y9 m# g; t! i7 F0 E
my-column ;; the column of the intersection counting from the upper left corner of the1 f( l4 W( k2 ]$ ~/ G5 T5 u! W
;; world. -1 for non-intersection patches.) k X3 y% P' I8 c& z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ C: K$ M8 i( z/ g! {
auto? ;; whether or not this intersection will switch automatically.& k* }5 Z) p# O3 c4 u- p6 d
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
! d4 U; v( D, _0 X7 ]& s;; Setup Procedures ;;
$ P6 P6 G Z' g$ h6 e;;;;;;;;;;;;;;;;;;;;;;
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( r0 i- ]3 V, e8 D" e' s;; Initialize the display by giving the global and patch variables initial values.1 r9 g7 F/ O) @2 d
;; Create num-cars of turtles if there are enough road patches for one turtle to
' V `! H2 n1 U- ?( f& h;; be created per road patch. Set up the plots.& L. O* i% x$ [( C t
to setup
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setup-globals
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) c j3 c5 v' g6 a1 S( k: i% }& N$ O& X ;; First we ask the patches to draw themselves and set up a few variables+ Y0 h s' Z2 e5 ^2 R
setup-patches# _+ r! d+ S2 U y# \- D
make-current one-of intersections
' p; y3 h( o& l A# f+ L" y label-current
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4 L+ @) J6 U0 A$ j set-default-shape turtles "car"
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if (num-cars > count roads)7 d( ~& @4 U$ u$ e8 P9 E
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0 v, D; }: \8 R user-message (word "There are too many cars for the amount of ". y, {% A! U; Y; [/ m1 u
"road. Either increase the amount of roads "1 T1 c+ V% ]' u, p. ~8 B. ?
"by increasing the GRID-SIZE-X or "
/ ^/ c( G0 `, s/ c) Y "GRID-SIZE-Y sliders, or decrease the " a, J% ]; E0 B% h* A
"number of cars by lowering the NUMBER slider.\n"
1 F/ D( W( ^: u* ^* Q8 f "The setup has stopped.")( S; d9 S; V* V; y( F
stop
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- d# [ V2 F) M! r$ K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 o7 a0 d; r. W# Y" Z; f, g crt num-cars
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setup-cars
9 N/ [$ `$ G" H9 c3 J4 C' Q, s7 `3 l set-car-color
) i* ~: ~& L8 T* M: d% B- p0 V/ L record-data+ h/ I5 t/ i0 p/ l4 ?
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) v" {" ]0 C4 T: Z# N; F: X/ U1 t ;; give the turtles an initial speed0 s6 [9 w& l+ M- j9 \
ask turtles [ set-car-speed ]
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8 V% V, f" G3 V% l7 a$ V reset-ticks: Y! g' N9 c7 \2 e# |' G. s
end
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;; Initialize the global variables to appropriate values1 b6 x2 e3 m0 Z1 h5 x* }
to setup-globals" z1 e/ ^: h. Z6 O8 }4 x4 x1 J
set current-light nobody ;; just for now, since there are no lights yet
" G" ^ ]* |! q; V2 p$ S, w8 V4 m set phase 0
) [3 N7 k h4 u7 P set num-cars-stopped 0. C+ g3 N$ _4 Y$ I7 Q
set grid-x-inc world-width / grid-size-x- K9 R! g$ M9 L0 R/ v* D; r6 K
set grid-y-inc world-height / grid-size-y- J+ P! W+ Q2 q: S" }1 ]; l
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* `6 H5 E% q) q- ?" b set acceleration 0.099
# u- M7 _) Y2 N2 j( J; _6 ?* L5 ]end
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2 N3 \* p5 K% r, p% s& q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) l4 `. {0 ^* h' c' o: k;; and initialize the traffic lights to one setting- u4 c T/ }6 o$ q# v. |; j1 Q# r
to setup-patches
. r- N1 N* k- }# q ;; initialize the patch-owned variables and color the patches to a base-color
* @) E+ X R# l% m6 @' [9 r3 M ask patches
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% V2 P& D/ J4 U set intersection? false
( F8 Q/ l3 i( f set auto? false
* V9 f/ Q) c" T; f set green-light-up? true" e6 z7 E7 ]1 m" u' ?
set my-row -1
" k: c8 g9 j' L5 L& i" I set my-column -1
9 J9 }( [6 l- l set my-phase -1
8 f3 i( p) K; N& i2 N; o" f) } set pcolor brown + 3
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6 K4 D ^- `( X& \6 _: j1 V. w. g ;; initialize the global variables that hold patch agentsets
; A5 U) @+ g: J set roads patches with
; i9 b9 U3 \& m; ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
R4 m# X" c% p: m Y4 Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. u9 i: N; u3 [' a( ] set intersections roads with
1 s, e# l1 W8 ]& W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 M8 ?/ T [5 K _. ^6 P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% t" P* z3 c( R% M! ^; Y) d
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ask roads [ set pcolor white ]9 ^9 G% l) S! K% j* W2 @
setup-intersections
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8 U! P' o) y. i. v% [: O其中定义道路的句子,如下所示,是什么意思啊?
& E1 p: J, U c. A- w. f' R1 j set roads patches with
3 Q. ?- ^: D0 Y" O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% L* p- s% S2 q& U, d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 n' b+ ` O& ~9 ~0 v. ?! s
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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