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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 K- H, x |) {7 t) P$ qnetlogo自带的social science--traffic grid这一例子当中,$ }& {! d4 n2 N# ]& a
globals
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8 {7 ?. m/ W3 E, i6 u, _3 g grid-x-inc ;; the amount of patches in between two roads in the x direction8 c6 V* \. Y8 ^0 c G T7 c0 b3 c9 q8 n
grid-y-inc ;; the amount of patches in between two roads in the y direction
7 [: \ P8 J1 t8 t5 y+ X4 r acceleration ;; the constant that controls how much a car speeds up or slows down by if8 X3 z. _# f( A; z; E* T% U
;; it is to accelerate or decelerate
$ K$ D" ?- u8 T6 E: l phase ;; keeps track of the phase
2 X; f( d0 _: s" i8 u, z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure7 H7 \9 O) ~* v! U: v: V
current-light ;; the currently selected light3 u: _. j% ]6 {! W5 K- e7 s2 C
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;; patch agentsets
' C: J2 k: R9 v% _2 Z6 m intersections ;; agentset containing the patches that are intersections0 Z7 C! @. Z% @& [6 u9 J/ Q
roads ;; agentset containing the patches that are roads
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5 ^* d( s+ f& I9 G5 Xturtles-own
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3 J. k% j( A+ @( X/ I speed ;; the speed of the turtle- o6 d% D2 u h9 {. v
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% M9 [/ A8 c4 Y g; n wait-time ;; the amount of time since the last time a turtle has moved7 Q& l: Q: Y' d6 J7 T% C
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. S7 ^$ `; E( N* A+ b# q4 Apatches-own
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intersection? ;; true if the patch is at the intersection of two roads+ }- O" f3 l+ ?. q! \9 \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 o6 n( p0 A9 }/ A' @ ;; false for a non-intersection patches.4 x' _0 K4 l/ l7 O* f; `- W) p
my-row ;; the row of the intersection counting from the upper left corner of the& h3 C4 c0 K0 |
;; world. -1 for non-intersection patches.
! ^9 }& N0 V2 [5 L- o my-column ;; the column of the intersection counting from the upper left corner of the3 y/ ^5 k6 f! V9 C
;; world. -1 for non-intersection patches.1 |3 y& r5 g6 Q
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) a- R8 r. h/ O" q7 H+ N( V
auto? ;; whether or not this intersection will switch automatically.
. V8 g9 k Y9 J1 B ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
, M* ^1 m: m% B;; Setup Procedures ;;* {$ E: O! Z; c- u# X
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5 U; i' V/ n( \, r$ k;; Initialize the display by giving the global and patch variables initial values. W% b. Z% v. |3 `. H2 `5 r
;; Create num-cars of turtles if there are enough road patches for one turtle to9 D" z0 y. S5 v4 z
;; be created per road patch. Set up the plots.: Q. h4 d" h! A0 {
to setup
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setup-globals
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/ n9 a, s% K) D4 f0 y ;; First we ask the patches to draw themselves and set up a few variables
* H0 z4 g$ m+ u8 K8 K setup-patches& V- c2 ]8 j8 Q, j4 `) p8 T
make-current one-of intersections- ~. ?4 D+ {+ Y! b/ x8 H
label-current5 W5 Y9 t3 c& O
+ S8 X- G3 J# }/ U set-default-shape turtles "car" A( q- P1 F& D4 X. o! r
- F( A' G" G8 Y! M# [ if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
7 D8 ~' q( R4 b; H "road. Either increase the amount of roads "
9 n/ j# @& n( Z0 W: J' E "by increasing the GRID-SIZE-X or "- Z- Z X* Y0 x3 b, Y @
"GRID-SIZE-Y sliders, or decrease the "8 p% ~# c5 j3 f3 c
"number of cars by lowering the NUMBER slider.\n"; P3 p! g! w$ T% s0 C" I
"The setup has stopped.")
9 e0 [& A' T3 Z' T1 c5 { W* Z 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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[
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set-car-color
& P5 G0 ]: w F( w record-data: p- y; i, B, C- n% X9 U
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% q3 A- k- t. b$ Q1 i7 s6 o# f ;; give the turtles an initial speed
' _4 u! z% i2 u1 i ask turtles [ set-car-speed ]
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3 P# y- ^5 `/ h. W! q reset-ticks
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;; Initialize the global variables to appropriate values
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8 q0 }* o. o+ [; g4 q& X set current-light nobody ;; just for now, since there are no lights yet
0 s4 c; g9 P/ p T& }/ m! M% p set phase 0$ D, a: u6 ]7 @% X
set num-cars-stopped 0
4 E( w5 c0 V0 C- H8 i0 Z: Z set grid-x-inc world-width / grid-size-x
2 i) a! s4 u" X$ ? set grid-y-inc world-height / grid-size-y4 k2 z" t. v, K0 H# 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
6 z9 C( V2 W ?" D" f t- F set acceleration 0.099
' Q" n. @- h# t6 B( v1 wend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 h0 B% p1 {% c1 ^;; and initialize the traffic lights to one setting4 [1 O7 L8 u8 c
to setup-patches5 Y3 q1 t* h9 H9 @
;; initialize the patch-owned variables and color the patches to a base-color
; ~( A+ J V3 ]$ i6 ~0 K ask patches
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set intersection? false
' l( B7 ~" h% s8 m$ s! s set auto? false; r- \; `+ X: M3 Z
set green-light-up? true: {( |/ c3 x" T3 y3 C+ f
set my-row -1
0 m' p7 W8 e! V6 V q1 z set my-column -1
- [9 M7 `) a4 n! ?- T% V0 Y set my-phase -1' q4 W$ N5 @% t; u
set pcolor brown + 3: I5 s l% h- g* T5 |; m% a
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5 ]# U# t3 ]* F+ W' Q! c+ h1 a, W ;; initialize the global variables that hold patch agentsets
; Q9 g2 T8 r0 [! Z$ `, k! [0 _ set roads patches with
0 y% j5 V) x8 u/ I8 c* p9 x5 g% V6 | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' q g" G5 O D/ [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 m7 N- E$ ^; v4 t" i6 I set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]- b: c/ @9 m" X! |
setup-intersections- z2 F3 y9 l5 U, o
end7 M$ [7 q% C2 h5 w* k i
其中定义道路的句子,如下所示,是什么意思啊?; w6 S3 X( y$ E6 M" { [2 N6 }# F5 q
set roads patches with" d$ M4 R0 l7 j# m: h c9 @. Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. t% O2 G8 N0 Z2 Q5 S5 ]9 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' b* k6 C' x% M
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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