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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。
: e$ a2 G; M0 {& o& g2 }netlogo自带的social science--traffic grid这一例子当中,9 _2 s) s2 d% I2 j( }
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 G; g! M* m/ K' I+ @ grid-y-inc ;; the amount of patches in between two roads in the y direction
) L; x4 h4 d/ R$ t6 [& {5 h' p( y. m acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ ~! d* h" C4 `, o% l* f ;; it is to accelerate or decelerate
. B7 Z$ r/ t7 Y5 ? phase ;; keeps track of the phase
- L7 l, z* Y' L- o& C( e! { num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" K/ c7 x$ O3 I( Z8 |; I6 z9 o+ ? current-light ;; the currently selected light
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;; patch agentsets
! h8 X, i2 @2 g7 ~ intersections ;; agentset containing the patches that are intersections
( t: f l5 X: Y& D4 F roads ;; agentset containing the patches that are roads! l, M+ G. h0 Y: _
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turtles-own+ {# ?- i$ I2 j! Q6 F2 i
[
5 H. R& n+ W- n: f% R+ ` speed ;; the speed of the turtle# o% E6 E" `+ y5 C% |/ W. C
up-car? ;; true if the turtle moves downwards and false if it moves to the right
- C. v3 o/ g( h: s1 I7 N ] wait-time ;; the amount of time since the last time a turtle has moved+ R& N" a) }3 B- ]5 m! d3 V% a
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( U% v1 t. x$ Kpatches-own6 S: r, F8 q1 r9 I% H0 k4 a
[
) K S$ X8 t3 J% F, z. { intersection? ;; true if the patch is at the intersection of two roads/ e- Z1 j5 X; x2 C5 E7 W! T$ y5 |
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 c: w1 k( d8 N6 P7 }, k1 v! ^
;; false for a non-intersection patches.9 \' |' i0 g, F4 i$ B6 n$ u
my-row ;; the row of the intersection counting from the upper left corner of the( d. m- }- c' h, R7 S
;; world. -1 for non-intersection patches., S0 m9 Q4 q" r8 A. c, I
my-column ;; the column of the intersection counting from the upper left corner of the) v H- s8 s. v# X
;; world. -1 for non-intersection patches.
5 D) l/ T- B3 W& Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.; j; W1 u6 U8 a# j/ d2 k
auto? ;; whether or not this intersection will switch automatically., h4 e6 ?, m& w2 r+ d' s$ ?+ P2 [
;; false for non-intersection patches.
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$ ^5 B& Q% F; h' n;;;;;;;;;;;;;;;;;;;;;;% i; ?5 H. J0 ]* c
;; Setup Procedures ;;' S4 O1 x ]4 b) y. E
;;;;;;;;;;;;;;;;;;;;;;' P9 ^) ~" s" V+ D! o
/ w( g) b& x% r R0 }0 n6 h' t( O3 h;; Initialize the display by giving the global and patch variables initial values.
3 B- ?- W; r* ?* J9 f; z;; Create num-cars of turtles if there are enough road patches for one turtle to: G0 X9 E5 ~: W. A
;; be created per road patch. Set up the plots.
2 a- n8 @0 g% J: M. H& w4 W2 C# E* Rto setup
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) Y/ d* v. l" q+ A# P4 u setup-globals! @) V6 G" F0 [
% b: n; v; ?% x2 d* l$ C5 K ;; First we ask the patches to draw themselves and set up a few variables* Y/ Z1 J% s" p( n8 y; d) z
setup-patches
' m: c# l4 J5 q9 p: H make-current one-of intersections% ~8 m1 r3 Y' _% ?( z" Z
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)* Q! z# T3 a) f' ^% Q$ Y' o$ f8 o
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user-message (word "There are too many cars for the amount of "8 L: S7 V) E4 ~! m& N
"road. Either increase the amount of roads "
8 K2 }2 G; k" d ] "by increasing the GRID-SIZE-X or "
: Q9 y X, J, ^& r0 G1 l+ r7 A% J "GRID-SIZE-Y sliders, or decrease the "
& \$ ?) w- j; H+ `; V) t' Q2 P "number of cars by lowering the NUMBER slider.\n". N3 F) L" u8 H6 _
"The setup has stopped.") B4 B' q' w j' |+ Y# b! A
stop% K) B8 r0 a" K- ~9 S
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& S; t8 v' y4 @# C/ F9 Q
crt num-cars
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setup-cars8 Z) e4 |" d% h4 y
set-car-color
1 @: {( X1 W5 z: s record-data6 s+ Z; ]' Q7 ?, x4 Y' I" o. ^1 x% b
]
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;; give the turtles an initial speed# {7 X% ~. S; Y% ~+ w
ask turtles [ set-car-speed ]7 U& r1 o! Z: K2 \7 x1 Q. f
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reset-ticks
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- N4 Q- ^0 H4 t2 F; k3 K;; Initialize the global variables to appropriate values; S6 W! R4 ?$ N& N! ?% g
to setup-globals
/ n* W, H' L* b! n6 c& Z7 r set current-light nobody ;; just for now, since there are no lights yet2 O( o2 l/ g$ A" A, k7 r4 ]
set phase 0 T6 d8 Y- Q2 L- [
set num-cars-stopped 01 R) Q$ R8 v; D' k# a0 }$ J
set grid-x-inc world-width / grid-size-x
% u) b- i' W& h' \! 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
! v% _2 U+ }+ |7 ^* {) Q v set acceleration 0.099
+ e- ~% U, A( F" X, L \end/ x. Q( f1 E5 {
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& r y# [4 ^& Y8 l0 o
;; and initialize the traffic lights to one setting$ S& c6 B4 f( s, D7 ]
to setup-patches4 t2 T6 D8 C8 J
;; initialize the patch-owned variables and color the patches to a base-color
% f& a& i8 Y& m6 o& e1 g. ~! M) u ask patches6 N) z2 K$ `6 F. f% A. m- t
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set intersection? false
# m4 J- ]& ~& Y set auto? false) [' `& i' r2 H' ^8 B/ G
set green-light-up? true
^* V* U; E" ^; [+ y% {9 Z! {: ?- I set my-row -1
: Y- s5 h5 H, P% v set my-column -16 f7 u3 I3 M0 I3 p1 l. ?
set my-phase -1( C7 H& M8 O. n% h( r
set pcolor brown + 35 D5 L( B" c6 E; E. ^/ _3 t% b
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5 {3 }0 h5 v% e ;; initialize the global variables that hold patch agentsets
2 _6 g; O8 w2 U1 ]. F' ? set roads patches with9 @% v P9 o! R1 H b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ E; _- p+ q, W' Z5 r! K) y( ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], Q Z. c1 k* K8 { Y- l5 Q
set intersections roads with( a# j8 `/ h5 T' h8 n' F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 L& h7 e) }/ ?2 G# e: P& p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
1 h. ] K. P7 z0 K' q- _ set roads patches with
: e1 `7 u: f( j/ d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( H# @8 m4 h% z. Z9 G5 b. y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 E5 E$ l" r4 G' I. P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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