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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。) h& z/ D: |0 ?$ f
netlogo自带的social science--traffic grid这一例子当中,2 ~& f: q" I- u; o8 H1 T$ t) l4 D
globals0 q* }4 `# z/ n* V( V
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8 P, n, X z4 q" s2 [, J grid-x-inc ;; the amount of patches in between two roads in the x direction
2 a+ C% g% c/ Y3 a1 A" U grid-y-inc ;; the amount of patches in between two roads in the y direction5 l% ~: u9 n f
acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ H+ l( d: [( |5 c ;; it is to accelerate or decelerate
C& Y, u/ A0 {. y/ } phase ;; keeps track of the phase
0 P, ^. p" \5 @* ?6 l6 \- r7 d num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' W: W- P: m' e! T+ U; u0 b* S2 e
current-light ;; the currently selected light9 J [1 C: [& L/ t
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;; patch agentsets h6 m0 W+ }9 w3 L9 [
intersections ;; agentset containing the patches that are intersections7 f: \. J u% y2 U# _
roads ;; agentset containing the patches that are roads
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2 i7 a) g( y+ I2 Y0 }1 jturtles-own2 v( G' y! ?% t3 T9 V* y0 s
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speed ;; the speed of the turtle Y5 k4 Z0 G' F9 A0 ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right0 M% J2 h# Y, x* y, c
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own7 F9 e+ t2 r* B! n! }- q
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intersection? ;; true if the patch is at the intersection of two roads
) |3 m) I3 N. A4 e3 q: F3 M% P green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 N# X5 a) c* f; A6 x( h
;; false for a non-intersection patches.
/ `6 k/ B6 v! {& I. z& F8 J my-row ;; the row of the intersection counting from the upper left corner of the
$ J* N- h6 I& {, Q( P) b4 l& l8 P) d. H ;; world. -1 for non-intersection patches.( F0 c; [, ]# J
my-column ;; the column of the intersection counting from the upper left corner of the
& \9 b' W9 p- o; D2 E3 X5 ? ;; world. -1 for non-intersection patches.5 j. R. D5 n. ~7 L9 M/ b1 g: r- s
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- s! M: Z. J5 B# C# u' Z
auto? ;; whether or not this intersection will switch automatically.
6 n8 P: M$ n# ^0 }0 @ ;; false for non-intersection patches.
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) t" S, Q0 }: Z6 d4 E- X;;;;;;;;;;;;;;;;;;;;;;
* s' O4 f$ U* q2 W8 c) n6 {;; Setup Procedures ;;
8 }1 [( X$ V7 O# i& X. a/ F: T9 \;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
' J# Y$ w, ^3 ];; Create num-cars of turtles if there are enough road patches for one turtle to
) P3 \6 m* L& i, o: w* j' X' R+ `;; be created per road patch. Set up the plots.
% s! J1 O* p- g! Kto setup% ^( D: l9 m7 k# J& F# x ]5 l
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setup-globals0 Z, n d4 ?( I
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;; First we ask the patches to draw themselves and set up a few variables
( ?( I" P3 n e# a/ a4 M7 c setup-patches
3 }% G; o8 H _0 S7 @) k make-current one-of intersections* ]0 Z+ f, {8 w2 x. |
label-current
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; w+ a5 z0 z2 ~# t- B, L$ n set-default-shape turtles "car"8 Y6 Z% E* ~# P4 t* B8 \+ [# o
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if (num-cars > count roads)0 H$ Z9 r2 C5 f
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user-message (word "There are too many cars for the amount of "6 o6 \: J& e) g) U- i2 b* S
"road. Either increase the amount of roads "
' k3 n, S3 i2 j- d: A- P "by increasing the GRID-SIZE-X or "
: f& j# w+ }0 {: b' g8 u "GRID-SIZE-Y sliders, or decrease the "
- h0 [2 x4 c$ u- | "number of cars by lowering the NUMBER slider.\n": k8 U9 j# |; ] w, K& ~4 p
"The setup has stopped.")
( m5 d0 h( y8 v+ i0 s stop7 [& U: G$ w. {! {; v/ a# Q
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! _1 q3 w$ H: i5 G8 s! o
crt num-cars
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setup-cars
, s2 h% O% g8 K, W set-car-color9 U* m6 u: x/ F$ m
record-data8 ^% B0 V; x0 O) ]8 k$ Z
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;; give the turtles an initial speed
8 \3 T2 q+ ~1 R6 A) O+ x ask turtles [ set-car-speed ]& v5 j9 B* e) A
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reset-ticks
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;; Initialize the global variables to appropriate values9 T, [ R. O4 I
to setup-globals. ?2 Z4 H, [& e9 s( k# w
set current-light nobody ;; just for now, since there are no lights yet
2 D4 q$ ~: G, D6 N- V( I set phase 0% [/ c5 ~( t# h( U5 T* A2 h
set num-cars-stopped 07 S# @7 |- L' h5 h
set grid-x-inc world-width / grid-size-x: F1 X# d* l* r' l
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
0 d! ~: E# w1 ~6 G0 B set acceleration 0.099" T3 s) f0 L8 I1 M! G
end% i6 o S: c/ A1 I: ?/ [
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, m3 J; i6 j0 E4 M;; and initialize the traffic lights to one setting
4 ~9 }# X* s0 U6 s- p/ Yto setup-patches) w2 g% x( Z+ v" n8 g
;; initialize the patch-owned variables and color the patches to a base-color! C7 z$ ?" y/ h9 `. H+ l' U
ask patches6 V2 a' I" z* n1 n9 m
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set intersection? false
* w/ e! d/ ?: N set auto? false# }1 v$ A z* D
set green-light-up? true7 x# M4 n) S4 \4 I5 L& i
set my-row -1
+ m" U3 ~3 U. ~% w) |& e9 d) t) K set my-column -19 A' G4 Q3 g+ i. R# ~0 J
set my-phase -1* O4 Q, M9 ~3 c0 A. A- z
set pcolor brown + 3 F' W- p. ?% F
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0 ?) N0 Z% f: A3 v8 o' T/ r ;; initialize the global variables that hold patch agentsets7 h, w. y8 s \. \% a
set roads patches with& U7 I% F& W. T7 r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' `% b F" h+ I/ n) x, ?# g$ Z1 H1 ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ n! [0 L. _2 J7 E' W
set intersections roads with( Q0 S9 ]$ {0 l% y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' }+ O U/ S& n( E8 f8 b& b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 o6 P1 l% J3 w }! q1 l0 d+ p8 w
7 R' z1 \8 x9 l4 L3 k ask roads [ set pcolor white ]
& X/ `" F) R$ i0 i setup-intersections
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4 `4 ^& D0 c' Y5 [ W其中定义道路的句子,如下所示,是什么意思啊?
( l; C4 Y& i: Z& N0 E" c# V set roads patches with' u/ ` P% t& F9 @8 ]4 J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 Y) Q) P4 s& V' C, Y& `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 ?, o0 l" k5 o! P& K- F7 _; 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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