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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。
1 g1 q5 ~7 e. b' X: ]6 r9 W2 ynetlogo自带的social science--traffic grid这一例子当中,' ^) F6 e+ ~# s- A% Y/ W
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
" w/ T2 w! @) t: m grid-y-inc ;; the amount of patches in between two roads in the y direction* H) ?! S: [ c0 D. v" w
acceleration ;; the constant that controls how much a car speeds up or slows down by if
: d( v( e7 F/ h ;; it is to accelerate or decelerate
/ r3 U F6 f* }% G phase ;; keeps track of the phase
$ `! A0 P5 \3 o3 O8 }0 B num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, f; v, n* j: A! L! u9 G+ \9 f
current-light ;; the currently selected light
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;; patch agentsets& r, S, ~+ q8 [/ x8 H
intersections ;; agentset containing the patches that are intersections* }' S" X6 a8 A9 a6 n. ]
roads ;; agentset containing the patches that are roads( x( t$ Y8 K5 v7 H$ t
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turtles-own! N7 g) V; n' N6 l4 c( o
[
) z( r! C1 G: C" @. C* M0 n* ? speed ;; the speed of the turtle/ O$ [3 b5 ]" I1 N4 E
up-car? ;; true if the turtle moves downwards and false if it moves to the right; ~- }! Z8 S5 t
wait-time ;; the amount of time since the last time a turtle has moved
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% Z, k+ |$ ^8 o2 _2 N& b2 U# Spatches-own" J. `- Z) i% D0 z" k8 q3 ^6 S% c
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intersection? ;; true if the patch is at the intersection of two roads) q/ g. G) ], S' {% e0 S4 E
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ f& W$ b9 O) J! u ;; false for a non-intersection patches.! Q* U) P( _. u
my-row ;; the row of the intersection counting from the upper left corner of the9 k+ I3 ?2 o) f* ^7 R
;; world. -1 for non-intersection patches.
1 B2 @: T8 Y+ B" |2 y5 x my-column ;; the column of the intersection counting from the upper left corner of the3 B& b# A; e- h+ _% | ?
;; world. -1 for non-intersection patches.
7 X8 L! K j( [ a( J6 S my-phase ;; the phase for the intersection. -1 for non-intersection patches." f: A0 c# }+ u: \* F
auto? ;; whether or not this intersection will switch automatically.
2 E& E! k H; ?; o; o1 y ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
; O- k. B8 M$ {. n* [2 r) h;; Setup Procedures ;;7 f, V# l% F1 ~- E J
;;;;;;;;;;;;;;;;;;;;;;
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$ T. f% }7 w6 ?, D7 B7 S, F8 S;; Initialize the display by giving the global and patch variables initial values.
' T; l0 q/ E! V" p' ^0 W2 q' z' A;; Create num-cars of turtles if there are enough road patches for one turtle to, X, E) t2 c# m9 B/ a7 h6 @
;; be created per road patch. Set up the plots.
" A* ~+ l6 g- [1 j: ]# Lto setup
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setup-globals1 r: T/ N# c1 W6 {6 X$ [- e
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;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections3 r8 }' \) O3 X+ L) d- U
label-current
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set-default-shape turtles "car"7 f) j) Y3 J9 |. o
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if (num-cars > count roads)6 R" `/ w; m l `' c6 l9 U9 ]$ `
[
4 q% e1 C# z. |4 R. X( P* } user-message (word "There are too many cars for the amount of "
- Z: @2 X7 k( f1 z3 W "road. Either increase the amount of roads ", M9 c* |: H8 ^9 f, F( T2 y5 j* C
"by increasing the GRID-SIZE-X or ") r. q+ e3 ~6 j; p; o
"GRID-SIZE-Y sliders, or decrease the "
7 f6 y5 a; C4 P* ~0 u: V% v9 q% a "number of cars by lowering the NUMBER slider.\n"
: v9 p. j' T( M A" d( U7 v; g "The setup has stopped.")
* R4 Y0 X$ e) Y9 I 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-cars5 o% p' P) f# p2 s% N
set-car-color* l0 W+ f2 {2 @& J; Z% r# j) U
record-data
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;; give the turtles an initial speed) i8 O& ^3 r7 s; P7 u1 |
ask turtles [ set-car-speed ]
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reset-ticks9 n0 `# N- d5 n6 h; ~' d
end U. v9 J4 J) g
+ j H3 T: V3 s& w; D% a0 _;; Initialize the global variables to appropriate values z1 Y: D! `' ~6 d2 l
to setup-globals2 s. Y u! H" o
set current-light nobody ;; just for now, since there are no lights yet
9 c% ?5 z- \9 h) e5 F. O set phase 0. x2 M T5 o) R
set num-cars-stopped 01 Q4 y* B- B2 B2 v
set grid-x-inc world-width / grid-size-x
. P9 z8 }6 C' M/ w set grid-y-inc world-height / grid-size-y, K7 v, } n9 T1 J3 C
9 \ u c, u0 p) A3 l, x ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# n, F: Y* b% @3 X' T set acceleration 0.099" u( g0 U5 h3 b' V! E: R
end
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/ w; T" [, [" x1 G/ G& c;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& S0 C/ b/ k+ `. h;; and initialize the traffic lights to one setting& T* y! b3 d* u! P1 G8 o
to setup-patches
5 ]9 W: l7 O7 x8 w4 a; R( N ;; initialize the patch-owned variables and color the patches to a base-color7 k4 T8 p3 @3 V" F, y2 s
ask patches5 E8 ^8 V/ a( Q
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set intersection? false7 x& c, [9 P y# T+ z' c' d$ N8 f6 T
set auto? false
3 F1 X* S& F# p, f5 A: g3 ] set green-light-up? true
8 d1 u6 c, x y" U8 J/ s3 M# G set my-row -1; H6 U5 d$ J* b( A% F& }4 {
set my-column -15 y: M1 r# Q& \8 F% W# }
set my-phase -1* Y9 |1 p+ _/ G$ K0 S
set pcolor brown + 3 u2 ~- w+ }$ f# B& l+ [) m
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;; initialize the global variables that hold patch agentsets. K9 @3 Z, M8 W( V
set roads patches with
+ ]' D; V* W* t- v' G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 y! Z7 p) C8 l, q! I8 h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ G2 g! [7 G5 D/ t" {1 u set intersections roads with9 ?. L% u+ c0 F9 F! |, C2 h" N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! h: R& d3 E7 u, Q1 _7 n( B" O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ x0 Q2 t; Q% k9 p! o" m
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ask roads [ set pcolor white ]
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end3 g5 b d E. r7 f( J# p2 B
其中定义道路的句子,如下所示,是什么意思啊?
, Y1 @& Z) ^- ?2 s; Q set roads patches with, C% |0 u3 T$ z3 H
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) i# l3 R1 _! j3 ^5 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& m& E7 t- [, ?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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