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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。
/ U* M& B! `5 q, [netlogo自带的social science--traffic grid这一例子当中,. i/ v" Q* u. U5 w. X
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 e! U+ s8 d( y' H grid-y-inc ;; the amount of patches in between two roads in the y direction
7 P2 [ I9 r2 `9 ]) U acceleration ;; the constant that controls how much a car speeds up or slows down by if
! A1 u- n9 w: M" z, G ;; it is to accelerate or decelerate Q* z" \( N5 l7 i- e7 F
phase ;; keeps track of the phase+ Q; c, }% l* N1 o6 G
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) i: o: n& j6 v z% K
current-light ;; the currently selected light
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;; patch agentsets
) w( p1 r- U* M V% a0 r intersections ;; agentset containing the patches that are intersections
1 ? r# i( M( Z8 {- w roads ;; agentset containing the patches that are roads1 R4 T+ }( ?' u2 [& d6 e
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4 z+ B1 _6 M. K$ o) \turtles-own7 h5 ~8 _4 L3 _* `/ U
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speed ;; the speed of the turtle" {! y) o8 ^) o/ [
up-car? ;; true if the turtle moves downwards and false if it moves to the right0 f0 R& L; T& ^* o, R
wait-time ;; the amount of time since the last time a turtle has moved
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0 T7 }* U/ L+ W/ t8 H6 k' spatches-own
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intersection? ;; true if the patch is at the intersection of two roads# M0 P+ a3 e" D! r
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ V8 l! f" e$ Y$ C0 }9 k
;; false for a non-intersection patches.+ e, v5 m# p3 |1 Z
my-row ;; the row of the intersection counting from the upper left corner of the
3 J# O4 L% R1 V6 _) F/ @ ;; world. -1 for non-intersection patches.
$ b ], f* H! Z# V. d7 ~. @ my-column ;; the column of the intersection counting from the upper left corner of the
& h0 D4 k" \- Z9 j+ S7 ^- | ;; world. -1 for non-intersection patches." {$ k$ o- o3 ~5 g
my-phase ;; the phase for the intersection. -1 for non-intersection patches.+ V! v% S7 n7 W S+ v* r
auto? ;; whether or not this intersection will switch automatically.- R4 o9 ^5 j9 @/ d' R! o. E" a7 n
;; false for non-intersection patches.
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9 M* G' ]- }( s$ N0 z. d% _;;;;;;;;;;;;;;;;;;;;;;9 h* y! I; e! Z. k
;; Setup Procedures ;;- \$ x9 S Z( t2 |3 S. S
;;;;;;;;;;;;;;;;;;;;;;! p: t O) ], Y: H8 @9 \
9 \3 C4 G; z: B/ ~0 J;; Initialize the display by giving the global and patch variables initial values.& z. _% K# y* y) F
;; Create num-cars of turtles if there are enough road patches for one turtle to$ Y, E& X' {, t- e2 @7 ~8 u
;; be created per road patch. Set up the plots.
1 z- u7 F6 t4 pto setup
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" L1 {" T: E, q5 n7 g5 t4 i% B setup-globals8 N( Z% F3 O1 A' H* Y0 e0 _8 A
7 w, G( W5 \/ u( h- ]& m ;; First we ask the patches to draw themselves and set up a few variables
" @8 B9 s2 f/ {& G! ?3 s3 b4 {) @ setup-patches5 R+ f" g- M3 n3 u' c9 d
make-current one-of intersections4 m& G8 U' g8 J, {2 J8 b- [% e6 Z! o0 D
label-current
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set-default-shape turtles "car"
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( e6 F. {1 t7 |; y if (num-cars > count roads)
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8 n" U5 ~6 X$ R1 s9 v6 B user-message (word "There are too many cars for the amount of "
1 [( r* e9 y" U' k$ V2 o: \ "road. Either increase the amount of roads "
9 e. S/ L2 }/ v9 ]% z6 W "by increasing the GRID-SIZE-X or "
9 |3 r/ Y% ~8 s" A x: C "GRID-SIZE-Y sliders, or decrease the ", a0 G# k$ u% D9 U
"number of cars by lowering the NUMBER slider.\n"
$ {% L* q: x$ Y- B, y, N "The setup has stopped.")9 O3 i2 X O2 d) N I7 p. j
stop5 i/ K; x) @/ t; c/ M/ T) z' J
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4 O. o, h. [+ b. z7 W5 ? ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 ?1 P" O# L4 O, V/ W4 |# @ crt num-cars
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setup-cars
4 s% u5 @. N6 Y2 V set-car-color
" B( o. b* _8 Q2 y& F$ C& d record-data
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;; give the turtles an initial speed7 u0 |! C$ c; w. v* E1 C
ask turtles [ set-car-speed ]5 `: P9 N% e8 C* n) `: a; a( L
' }# A. ~+ H6 O reset-ticks8 s, v7 \, Y- G4 _$ n
end8 I8 [' h g' Q0 J8 K
3 l: J* Z" S4 d;; Initialize the global variables to appropriate values9 `6 f# z4 j2 Q8 A* q
to setup-globals
& r( g6 L9 z+ y( g set current-light nobody ;; just for now, since there are no lights yet
* Q/ v( o, ^0 g1 P. z B set phase 0! x" V: `, m) D, O1 E; J: H4 y. k
set num-cars-stopped 0
; c7 N/ u& T4 g- U/ W" S! t set grid-x-inc world-width / grid-size-x3 }" Q# f) k6 X+ R6 z. F
set grid-y-inc world-height / grid-size-y' C/ ^+ z7 o3 ]6 l. E
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' o& G/ w; f T# U
set acceleration 0.0993 d. j4 L K' l5 m$ G) U
end, ?) i! t' ?$ v/ H$ j; \( J# `
; B. K/ S k% s: f$ s. N8 i;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ g" n" l( |: X' x7 j: H8 a
;; and initialize the traffic lights to one setting4 o9 J6 c. w; q
to setup-patches9 j+ V! h# i% T5 @) L! Z; P( [+ r
;; initialize the patch-owned variables and color the patches to a base-color
+ o1 U2 M4 S$ W ask patches4 i* ~8 R- c+ _- {2 x3 J1 T
[
6 F1 f; H$ j3 H7 F4 { set intersection? false
9 q; s6 v7 b+ L* s @ set auto? false5 O8 `/ h( h) H0 ?5 y" e; v
set green-light-up? true% M! J5 B1 C5 f
set my-row -1
9 t0 [& t$ w7 _. v+ l- T/ u set my-column -1
* ^8 v) `+ Y0 |) `$ k! c set my-phase -11 i% Y3 }" a* H6 G( S
set pcolor brown + 3! v, F' s5 q \' u; m8 f
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5 U* S5 h) ?+ T3 X ;; initialize the global variables that hold patch agentsets
, P: M0 M( u2 d set roads patches with* s' }, s; P! B* ]. n- j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 i; k' ]$ F" j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 |* j) V* G }
set intersections roads with5 \5 x d& e+ j* u+ x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" n6 B" O* }# @( Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 u2 |% {, r5 x0 N; p8 J" J
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ask roads [ set pcolor white ]
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end
4 w2 V% o7 G! ?1 i% ]5 @其中定义道路的句子,如下所示,是什么意思啊?6 P: D6 h. U6 p+ r, r
set roads patches with
) _" i C e2 D0 u q$ s7 y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
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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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