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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。
4 l' E3 S0 A: ~+ gnetlogo自带的social science--traffic grid这一例子当中,) J# {" R2 S6 S! p' V8 c5 x
globals
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/ E8 a: u4 g( x, a# d3 { grid-x-inc ;; the amount of patches in between two roads in the x direction
% e& t) m' a2 {. q grid-y-inc ;; the amount of patches in between two roads in the y direction
: m1 J1 B. h1 A' [% X, F acceleration ;; the constant that controls how much a car speeds up or slows down by if
% }: b4 @3 b9 W, Q* i+ ~- Q ;; it is to accelerate or decelerate, ]1 Q( ]2 D2 c& _' `
phase ;; keeps track of the phase
) r. E) K% p7 @: o7 O num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: Q0 r& o( U& M$ G7 }* s. a
current-light ;; the currently selected light+ P, a: ]* _) K" D$ Z9 Y
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;; patch agentsets, j) u+ {. R: A* t
intersections ;; agentset containing the patches that are intersections
* p" O: V* i$ y4 V: x roads ;; agentset containing the patches that are roads L- t( g% ] }$ `5 n# M
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turtles-own* E0 H% s7 M5 [' S s
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speed ;; the speed of the turtle
0 N( C, N% L2 z6 `+ h9 k up-car? ;; true if the turtle moves downwards and false if it moves to the right
v: K/ U! f$ m, b7 q/ F wait-time ;; the amount of time since the last time a turtle has moved% ~3 Q" J# J' A. T$ n
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads* V" A0 r6 G3 G+ w7 k4 [
green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 `* ]5 b8 T$ m$ k" `4 x
;; false for a non-intersection patches.9 V9 J6 W& O- M( a9 o }
my-row ;; the row of the intersection counting from the upper left corner of the
9 N' ]: L/ t: @0 G ;; world. -1 for non-intersection patches.) q3 l6 T/ e1 c1 K9 N
my-column ;; the column of the intersection counting from the upper left corner of the2 h- I' h* m; F( d# {0 S
;; world. -1 for non-intersection patches.
& Y) L- P0 U2 k5 \9 f8 ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 g! { q' |; k2 a- W" y auto? ;; whether or not this intersection will switch automatically.3 Q9 D* \1 m. x% O. O6 G
;; false for non-intersection patches.8 ]" L8 v. ^8 w1 O1 p! q+ A- t1 ~
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: ^4 L0 ]1 z% R- B- U- x;;;;;;;;;;;;;;;;;;;;;;
! g" g" x! l3 ?% j;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
% A& }& ?( S4 B# r. s;; Create num-cars of turtles if there are enough road patches for one turtle to
9 y H4 e. z9 f# C$ N2 ?;; be created per road patch. Set up the plots.+ c! b6 L% G: [6 V7 v! l' z
to setup
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D8 Z0 a9 Q4 A( j* | setup-globals0 |6 o3 {& B, f, w
0 @8 P4 i, s8 V" ^7 o# y" l ;; First we ask the patches to draw themselves and set up a few variables
6 Z+ [$ W9 }4 j setup-patches: |! }/ W' S0 B, r) J! A( a
make-current one-of intersections
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set-default-shape turtles "car", i, _ i- C- x- C6 G2 a0 j
3 p% y% S+ X/ h* m if (num-cars > count roads)/ U+ U J! a8 x! m1 {; s8 Z6 |5 W
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user-message (word "There are too many cars for the amount of ": t, d* y+ n/ K( A
"road. Either increase the amount of roads "
8 D9 _5 c7 D& i "by increasing the GRID-SIZE-X or "9 |3 ]: ~; j! I' n7 G* w; ~3 ~
"GRID-SIZE-Y sliders, or decrease the ") `" k) A) W L7 t
"number of cars by lowering the NUMBER slider.\n"
& ^* c: F0 u6 o" a/ d) G( Z9 M& Z "The setup has stopped.")
, `8 m/ y6 s% | C stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars
* I. D5 h% \/ f set-car-color
4 I0 e" n: g1 f1 X( m8 u; E# v record-data1 c4 [0 G4 [8 g
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;; give the turtles an initial speed$ ]6 Y6 A5 w: N
ask turtles [ set-car-speed ]
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reset-ticks4 P+ `, C5 A$ F# g
end' r c6 @/ }- l+ x- V9 M5 a7 `
8 [( O0 H1 `' v;; Initialize the global variables to appropriate values( g1 n% V0 H% _5 S2 r9 F! D* S" h
to setup-globals) ]. a6 _- \; w2 J
set current-light nobody ;; just for now, since there are no lights yet
6 A0 f1 \( `* p set phase 03 {+ P8 k9 J2 L) T
set num-cars-stopped 0
+ M6 e7 W- M. K" F set grid-x-inc world-width / grid-size-x& J, |% `' V) K1 N
set grid-y-inc world-height / grid-size-y
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# g& C( j' _2 C+ p- f4 A0 H8 J( d ]! t# ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ C" N$ \$ z3 V+ W/ ^' ?: b! J% V set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets," v$ @, J) v$ L1 a2 u
;; and initialize the traffic lights to one setting
/ S* A. s0 t4 k) ~" sto setup-patches& F/ } Z1 j Z- U+ t+ @
;; initialize the patch-owned variables and color the patches to a base-color
$ @ |- J" J! t8 m% I* u ask patches' ?) t, ~- E4 _ Z- W* h4 a
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set intersection? false) G1 x8 S) ]- W
set auto? false
$ A1 n- r- ~( y3 v# n6 q: W. M set green-light-up? true
! Z% H2 X1 o4 |9 | set my-row -1
. H# I2 v( e2 v0 ~* s, f set my-column -1
1 M9 ~. J* p3 h' _$ O1 w8 v1 ]9 x set my-phase -1
4 A- N, i; m7 `( l% M& E. x set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets2 d" b6 O* Q i! W% ~
set roads patches with- ?# Y* ?3 M0 Y3 m/ z0 s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ I; I, g/ R$ T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( f' r- `7 K3 j3 m( }2 b, j5 X set intersections roads with* {, _% t* o2 m. t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and( H$ A& N: h0 t' |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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6 F6 O' k {5 g. E ask roads [ set pcolor white ] O. u) [) N! Q) y8 z
setup-intersections. s- N, j8 c& Z5 y! B, T
end. d) U, u1 B9 I& o
其中定义道路的句子,如下所示,是什么意思啊?* w( k/ ?1 ]- q z; X, B/ G
set roads patches with' | ?7 w6 f5 q, z7 X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, E& x! u+ |% y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; a# d5 ]2 Q1 F4 _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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