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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。
6 d: A, m6 n& [netlogo自带的social science--traffic grid这一例子当中,
0 l/ j+ v& @ E; Iglobals
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/ ?' T2 h! C" u- b, |' h* v grid-x-inc ;; the amount of patches in between two roads in the x direction2 Y4 O! d6 l, x! ~" @
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ C6 @: h6 ~3 `8 G' B: G acceleration ;; the constant that controls how much a car speeds up or slows down by if U3 o6 a+ K7 K; a! Q1 d
;; it is to accelerate or decelerate4 x8 x+ Q- M$ ^* _1 }% e& S% O
phase ;; keeps track of the phase9 w, Y, K) |: B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- i! Z6 E; X) q5 x% Z% v. L$ p current-light ;; the currently selected light
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2 T( T, h/ l2 [) m ;; patch agentsets" {% w! N7 j. C( U4 R
intersections ;; agentset containing the patches that are intersections4 A+ X) q* \4 G9 i1 e' P0 ?' A
roads ;; agentset containing the patches that are roads
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W8 K& @; H# G) Z3 @3 Kturtles-own: [8 \. |# u8 c
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speed ;; the speed of the turtle, b; Q2 B q% {0 D
up-car? ;; true if the turtle moves downwards and false if it moves to the right& N' H" m- {) a
wait-time ;; the amount of time since the last time a turtle has moved
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) R: N, ?/ ~; Y" jpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
; u! ^& |' L6 j" W8 G5 _# |2 e green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ H6 ^( Z3 l, i4 C: o
;; false for a non-intersection patches.7 R" F: Q. s$ o
my-row ;; the row of the intersection counting from the upper left corner of the. W. \9 x3 e$ ^9 e+ w
;; world. -1 for non-intersection patches.2 Q$ p8 q7 z' L& e2 k( \- F- ]
my-column ;; the column of the intersection counting from the upper left corner of the
) \" D' ]6 n. x. Q, Z, b% I ;; world. -1 for non-intersection patches.; h4 t! |! I( V. Y! w9 r; O
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& v9 L' A: k+ l z
auto? ;; whether or not this intersection will switch automatically.
) i' [$ x# U/ H ;; false for non-intersection patches.) z4 |! k1 F) t9 I' K( L( U
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;;;;;;;;;;;;;;;;;;;;;;
9 n7 {1 s) m& f" G;; Setup Procedures ;;
, g% _+ K0 e4 _% w2 A% G;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
% x/ p1 |/ l, B9 L& p; W;; Create num-cars of turtles if there are enough road patches for one turtle to
& Y0 z% x- A: o, C;; be created per road patch. Set up the plots.
3 T* ~) G0 z( o6 Gto setup
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, ]% g/ s$ [, N# r setup-globals
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;; First we ask the patches to draw themselves and set up a few variables! |; p; z: B0 J O
setup-patches; ?% U: a2 T. U; R8 b9 x
make-current one-of intersections
0 M& G6 H; r; ` d k# { label-current, H. t2 n2 X" y& i; K; R" h
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set-default-shape turtles "car"5 d2 ? d' z; _* w2 |
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if (num-cars > count roads)$ l' J* [$ l$ \( Q) R; M9 c5 t
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user-message (word "There are too many cars for the amount of "
2 ~: _& r* K/ a* u$ }# s: X "road. Either increase the amount of roads "
7 v0 O3 A0 S/ c "by increasing the GRID-SIZE-X or "
5 K! R* l- j' t2 b3 S' J2 m" [( s "GRID-SIZE-Y sliders, or decrease the "# c% L7 {/ j! F3 j. l3 d& v
"number of cars by lowering the NUMBER slider.\n"7 M+ y7 g6 t% z2 m' @5 i
"The setup has stopped.")
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2 G* L- o0 G" Y) n7 C+ I ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ |8 l. D6 b7 r* t
crt num-cars P+ W# u! j9 Z2 ^* c
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setup-cars" E. n W3 u- Z' v8 R
set-car-color
& e% G% T2 p) p- P1 G+ p c record-data0 W) s) b8 G5 K# k% z
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( ^6 W5 L2 y0 d# M8 h4 J! M ;; give the turtles an initial speed
) _+ x4 l0 M9 D# j: T ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values
6 Q* z& |! X0 y6 G4 Yto setup-globals
( p+ k* s" P( W4 _ set current-light nobody ;; just for now, since there are no lights yet' C& X: g# ^+ s g p+ S" ^5 I
set phase 02 `/ @5 T+ I7 E" i+ ]
set num-cars-stopped 0; \2 b7 j/ J$ c7 W
set grid-x-inc world-width / grid-size-x/ W9 C0 r$ a+ F1 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/ x6 l. R4 o: o7 `. f- g
set acceleration 0.099# K8 e. n# i9 D+ H7 p. k
end7 G+ Y$ n; A: j3 ]
) f9 t' x4 G! ~9 _8 @4 Q% v4 r) V3 W/ w. d;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. b2 u) H( H% ~% T3 k;; and initialize the traffic lights to one setting
+ U. Q9 [6 Q+ i$ z' @. q# L0 N/ Dto setup-patches, N) L( q4 R% e
;; initialize the patch-owned variables and color the patches to a base-color: \+ N, F% z6 O. y
ask patches' M( s# t9 }2 j) q) A8 Y$ d0 n
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- X$ f2 O+ T; Q, t( b0 u( o M set intersection? false7 g, [; L' W6 Q+ [6 \* z: x
set auto? false O9 F) Z: ?% d
set green-light-up? true
6 a& l0 S) n Q1 }3 d j% v set my-row -1- \. Z0 |) U2 j H
set my-column -1
' i! W% I. ]' [3 E* c$ Z7 t set my-phase -1! s0 d5 c8 g, B$ _; W3 _' X
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
5 C3 ~+ ~' w! S8 o+ @+ `( ` set roads patches with6 l" {8 s7 ~- O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 d. P( j4 b0 E! t/ P- @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ `7 A& j8 M5 p6 Q5 ` set intersections roads with
0 E. ]7 C1 ~- t5 z3 l$ { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% }4 P- U. z& X. [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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" L: {; |- W5 ~8 z; g2 L ask roads [ set pcolor white ]
2 p) m- ]+ K o1 W- R$ _2 e, s& \ setup-intersections
1 Y. ~4 i* p: ] Q% y& L4 }end
" N+ Z. {4 p3 M [) M( m3 @4 I其中定义道路的句子,如下所示,是什么意思啊?
9 D- d6 |3 _. q) q& B3 L set roads patches with
) k/ n2 a2 f- `9 d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 b7 W/ Q' Y0 Z, m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 Y+ p5 d/ O! {5 w& F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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