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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 b# r4 ^6 s% T1 K: R! U
netlogo自带的social science--traffic grid这一例子当中,; E0 M! @- |. h. h, f2 v& I k
globals# ^: A* q0 C; g( W3 s8 }2 ~" ^
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grid-x-inc ;; the amount of patches in between two roads in the x direction7 k$ ]) b! j9 i7 C
grid-y-inc ;; the amount of patches in between two roads in the y direction
7 G( D& A& @: S3 P: C4 `7 F acceleration ;; the constant that controls how much a car speeds up or slows down by if; {' G {' J7 o. z% i" z/ \* A0 R
;; it is to accelerate or decelerate* u( X) G2 Z7 `% K7 M) h, d
phase ;; keeps track of the phase+ r ~; A( M3 |8 m' D9 q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 ~ F; Y# g# F- N4 I z2 a current-light ;; the currently selected light
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;; patch agentsets9 A7 Z7 r7 A# R
intersections ;; agentset containing the patches that are intersections
/ X& P& |0 t; N/ k( g roads ;; agentset containing the patches that are roads/ g v- B5 f2 v# F* O, ^$ ?
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5 A, w% j f+ K3 c3 R9 ~turtles-own
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speed ;; the speed of the turtle4 z+ v: J7 ^- a: `# i
up-car? ;; true if the turtle moves downwards and false if it moves to the right
: G% A0 l0 W& E& ]+ R4 `3 K% Z) o wait-time ;; the amount of time since the last time a turtle has moved4 m7 L" L% w/ L% o+ I2 `% |! |
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads7 f3 W1 |' {2 ]* ?7 T, Y- G
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 C1 f- i" C7 W8 V+ |
;; false for a non-intersection patches.
& G6 ~0 S1 v9 h2 e/ l my-row ;; the row of the intersection counting from the upper left corner of the. r0 u/ s# `( O# [* p
;; world. -1 for non-intersection patches.' F# i* J" b! y& X8 G/ K
my-column ;; the column of the intersection counting from the upper left corner of the
1 J0 f v4 o/ ?% m5 U$ F ;; world. -1 for non-intersection patches. R8 m- v% a5 W4 t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ X- n8 p- Y' r% x$ j
auto? ;; whether or not this intersection will switch automatically.% Y0 z6 u9 t. @ z$ b4 v( v
;; false for non-intersection patches.9 r! a- U3 j6 U& ?' c
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;;;;;;;;;;;;;;;;;;;;;;
4 P+ q/ d* L2 h4 H1 g2 U" t3 C;; Setup Procedures ;;
: q1 n! y3 l& j5 x0 Y;;;;;;;;;;;;;;;;;;;;;;
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3 v" V0 K, R- V) x' m;; Initialize the display by giving the global and patch variables initial values.
5 {# s7 l, A E: K4 d6 \4 l! }7 |) Y;; Create num-cars of turtles if there are enough road patches for one turtle to; W3 b3 K9 p u+ T, r/ v; `& f
;; be created per road patch. Set up the plots.
5 b( ]; t& Y% s, D" P ^to setup
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setup-globals
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1 @1 t4 d* [( ]* q1 z2 c ;; First we ask the patches to draw themselves and set up a few variables1 U# o) O3 ]. S P& u: s
setup-patches
e6 j" R m1 L( s) o make-current one-of intersections
- X# ^9 B, q5 i& i, L label-current' V, h% S- Q0 ~
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set-default-shape turtles "car"
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- c6 K4 H" {9 {/ h# q: f if (num-cars > count roads)
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2 g- U# V$ v) ^2 k user-message (word "There are too many cars for the amount of "" J* c) i7 D3 {6 g, r( R8 N) ~
"road. Either increase the amount of roads "# g' g" w- X# K g; V
"by increasing the GRID-SIZE-X or "
- C7 V* ~4 g$ b4 t9 T" w4 Z/ w "GRID-SIZE-Y sliders, or decrease the "
6 P# g% H+ S( j3 d+ Y "number of cars by lowering the NUMBER slider.\n"
! i+ ]) l; D! I# n6 ? "The setup has stopped.")
. N/ c4 \! W0 m9 }6 v) n! h. N, Q stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& E1 ?. j6 o. r* |: _5 j! |
crt num-cars
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setup-cars; g& _; b/ d: d6 V: J0 H8 {
set-car-color
3 N/ ]1 Q9 B% ~! P record-data
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- W Y+ g' w- u) P/ M6 J; z ;; give the turtles an initial speed
8 Y6 }( j$ M0 E; `1 M1 a6 \! Q" f ask turtles [ set-car-speed ]0 {' L* V9 e6 X/ I- F
6 r+ a$ h8 R) R" p& Z* b7 c reset-ticks* k; G7 }) {% [6 R. P
end
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5 k& [! z( C" O M- [8 r& V" X2 l;; Initialize the global variables to appropriate values
9 P; C/ L. M3 K1 P7 kto setup-globals6 U& O7 m5 T A2 C# m
set current-light nobody ;; just for now, since there are no lights yet( y4 A' \' F( R0 A/ u4 k1 K
set phase 03 }/ K9 k: g" e
set num-cars-stopped 00 B3 s, b1 S* K5 {' o& W) N+ P
set grid-x-inc world-width / grid-size-x
- z2 l4 h7 b# Z8 U& n7 i 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
& M3 N: K7 ~$ }; S+ a* e set acceleration 0.0992 J) |( z: T. x
end
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" V, \' a1 {4 X: O# f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, J* `$ S! h7 q
;; and initialize the traffic lights to one setting
4 l/ R1 {; v8 W8 [4 Y0 \! a, q) zto setup-patches
' ^, S% P+ Z' k- ] ;; initialize the patch-owned variables and color the patches to a base-color; K' X0 |& r; Q8 ^/ r' c
ask patches
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' {1 @3 G6 }# U9 r) p3 G set intersection? false# h. l3 V) l( d2 @; o
set auto? false
! M. s. a) j# p2 ]) i' l set green-light-up? true5 f! ]% S' k# X: X& i
set my-row -1* K1 e* K/ ]/ O$ r2 {' A* H
set my-column -1
4 E- |& X% e6 M$ h set my-phase -18 e1 {6 }; N1 |7 I4 t2 u
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
8 {# B8 l* ~& ?7 Q7 L+ z" | set roads patches with
4 |( P6 x% F6 x, a% H: P3 ^) V$ K; B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 h$ P5 W Y& _) p7 L! O# c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. [2 J$ R% c4 p0 y& ]2 ] set intersections roads with5 c- \0 W4 X1 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. k9 I- y3 G% |: F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]% { m& y3 T( _. i- M
setup-intersections) U- ~6 ]3 g6 j
end; @1 m$ a* C' `2 z7 n+ n
其中定义道路的句子,如下所示,是什么意思啊?% b8 @! F% [4 M4 w. G* T
set roads patches with$ h' G2 k. J) e9 H: f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- t4 _# X+ s; K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* M; s0 [! B5 p7 @) j
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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