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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。3 ` R2 i3 j& F) b
netlogo自带的social science--traffic grid这一例子当中, N9 Q/ q* t0 B. E" k' B
globals/ w; T1 c M+ Z; i
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grid-x-inc ;; the amount of patches in between two roads in the x direction, }1 N) r; m. E: q- H5 z
grid-y-inc ;; the amount of patches in between two roads in the y direction: M" a& }, k: Z: Q ^6 r! d6 {: S
acceleration ;; the constant that controls how much a car speeds up or slows down by if4 |/ m; `0 g; x
;; it is to accelerate or decelerate
2 Y7 A7 v% \8 } phase ;; keeps track of the phase/ b) P: ~4 L% g' S8 C/ C& h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ b/ J1 ?$ n& s! E# C
current-light ;; the currently selected light7 f! I2 k0 ]. e1 L) c; P& w
! W8 O/ H6 g, Y, \. R U, c8 b& p ;; patch agentsets( p0 S$ I: |2 W) I0 E$ m0 v
intersections ;; agentset containing the patches that are intersections
7 K! `5 I1 T; \* E/ ]7 Q' c roads ;; agentset containing the patches that are roads
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# h) K) H4 m8 C% Cturtles-own7 {& g+ E, H' Q- E* h& ?
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speed ;; the speed of the turtle% n+ Q; \, ?5 A# d: ^8 Y4 g8 E
up-car? ;; true if the turtle moves downwards and false if it moves to the right* ]3 {# V) _2 R
wait-time ;; the amount of time since the last time a turtle has moved# p% {1 ^3 @) v. O6 A$ c- m
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, c0 n+ x Q9 z( Zpatches-own* B! N) ]+ w* n5 g% D
[
6 U" j' V3 v2 L! b4 k4 l intersection? ;; true if the patch is at the intersection of two roads# J) q" C# ?* U/ q2 f! p& ~" j$ B I
green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ e2 a; H) N/ A5 U+ d
;; false for a non-intersection patches.) ]+ w' a7 ~9 r5 z
my-row ;; the row of the intersection counting from the upper left corner of the
5 X" \* n/ o& T; | ;; world. -1 for non-intersection patches.- n5 d |5 Y; i
my-column ;; the column of the intersection counting from the upper left corner of the
& [6 R( g. T: b( d o( ` ;; world. -1 for non-intersection patches.+ p$ m$ v8 e! H. K0 F" I9 B
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; [" H: A4 T: t- U auto? ;; whether or not this intersection will switch automatically.
* E7 p( o' Q2 ]' m0 E3 p4 e( T8 i ;; false for non-intersection patches.$ C y" q( T( U) V- T
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. o, g, i0 h3 w" Q1 [;;;;;;;;;;;;;;;;;;;;;;
7 D- U1 ]4 N' T& _3 H;; Setup Procedures ;;
/ ~- ^' u& c6 K* @9 i8 ?;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.6 |. ~1 o7 c) J6 ?6 H C
;; Create num-cars of turtles if there are enough road patches for one turtle to
% z* S2 y. g% J8 @3 O4 L# D/ J6 d2 l;; be created per road patch. Set up the plots.8 {8 X+ f2 j. r" A) m
to setup+ U! @% X+ U6 h3 h2 ^
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setup-globals
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5 u, s$ B8 ?2 d$ k ;; First we ask the patches to draw themselves and set up a few variables
8 ^* V$ y& U) x; m* N7 b setup-patches9 }: w' Z7 { c6 X
make-current one-of intersections) u$ ?5 A: x; Q) L/ ]) Y
label-current: J$ D1 H1 d* k3 x" E& i) k
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set-default-shape turtles "car"6 o! C, l. d# U7 n2 y& U
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if (num-cars > count roads)! q7 M$ I% m/ D
[
1 X( J) d4 ^" T' F5 t* S1 S6 ^4 d user-message (word "There are too many cars for the amount of "8 ~4 |; C: q3 _( }
"road. Either increase the amount of roads "
. n% c9 q& {$ a "by increasing the GRID-SIZE-X or "% D" z- K- e+ ~9 D& Z# M$ G
"GRID-SIZE-Y sliders, or decrease the "
e& G p9 R8 ?; I) B "number of cars by lowering the NUMBER slider.\n"
0 a3 Y; o- H. p6 w/ k2 J; e "The setup has stopped.")2 z" g1 r# t" V! o/ S* S
stop
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% D9 B0 h { Q2 u0 [ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. d; D2 |+ t& R crt num-cars
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setup-cars( i5 K- O3 {" |6 h
set-car-color% V) i# f! i* X) S& g8 }
record-data1 R6 U4 h3 u; H
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* g* {. ~3 ^. t' O$ X. c) x4 k8 Y ;; give the turtles an initial speed, s/ @. \( G. o7 I
ask turtles [ set-car-speed ]4 j6 d1 D9 J0 V+ Y# K; g$ q
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reset-ticks6 {0 {4 q4 }+ D
end
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;; Initialize the global variables to appropriate values
' D: \6 [4 m2 J0 [& g; uto setup-globals
* \$ }' Z* j3 Z( S5 Y set current-light nobody ;; just for now, since there are no lights yet
( ~; @) @% X, x set phase 02 t) {; i& Y( U+ z& x0 y$ T0 p5 e
set num-cars-stopped 0) ^1 z7 ^9 \8 x
set grid-x-inc world-width / grid-size-x k1 a5 f* O$ @* l0 J! K4 t7 y
set grid-y-inc world-height / grid-size-y1 s& c" t: m- u
4 z/ V9 a; J. A' Z' ^" Q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 z# E: ?3 E9 }: O/ A5 A set acceleration 0.099
9 g+ @- K, p) _' U, s9 Y# N$ Q% Fend' h/ n9 O1 u7 F- o1 S, Z: n& h6 V
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: F+ ^ [ B d;; and initialize the traffic lights to one setting
. T8 [ T0 M6 Z( { g$ mto setup-patches3 y5 K0 H. u: T. K1 f/ q+ d3 T7 W
;; initialize the patch-owned variables and color the patches to a base-color3 M- M7 a+ J( u6 r# w) a
ask patches
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set intersection? false7 K @1 P( J. {* P: P$ j
set auto? false3 z3 y! D: Q5 @; X/ h% M* m8 |
set green-light-up? true! |# p4 \" g2 L9 ~) u+ c
set my-row -1. Z+ x+ f) n7 l( c" _
set my-column -1
3 r! t. y% K# r4 ]! [ set my-phase -19 B1 W+ P" m# v: }8 ~# G
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
3 I5 M+ x! L8 V; Y s6 n8 C set roads patches with. W7 n) x# n; e( V- w% F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, \: J' w4 K7 A5 R' n4 k7 V, n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 i% G: K) i# C1 E7 k( X set intersections roads with& E" e$ U) S! r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ @! o% {6 u% F, l0 s2 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]+ d9 W0 R! W: x: v
setup-intersections
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, }9 n$ e0 a9 s; J其中定义道路的句子,如下所示,是什么意思啊?' U4 |* A4 i. T/ z. I* P5 l* X
set roads patches with) o( Q3 X6 ]" |" M/ r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. B% o# u/ V5 u1 H/ Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 A7 e7 ?8 v' _
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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