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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。
' X( H) z z) x! Dnetlogo自带的social science--traffic grid这一例子当中,( H$ N. H1 W/ F: m a" I5 H
globals
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1 {5 j0 F s9 S. @0 p2 g grid-x-inc ;; the amount of patches in between two roads in the x direction) ?- I5 T4 u5 J& _& v
grid-y-inc ;; the amount of patches in between two roads in the y direction' J9 R% |. C: b ^2 G/ ?( a
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 U( @8 S0 Y& v ;; it is to accelerate or decelerate) l% v2 m4 [; |4 k" X
phase ;; keeps track of the phase5 W' v) W& n. D6 E% E M6 {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% [) f/ R! Q8 ~. z, ?8 z) v5 R
current-light ;; the currently selected light
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0 q' g! d9 A: T" c! i# C% B ;; patch agentsets7 n R$ j6 q5 L' }/ l7 ~
intersections ;; agentset containing the patches that are intersections. z: K4 J4 C2 R% a V+ r
roads ;; agentset containing the patches that are roads( X4 |: [0 G, {' ?
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turtles-own
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speed ;; the speed of the turtle+ _! b+ N- L1 p# C) ?% M& G& P" ?* g
up-car? ;; true if the turtle moves downwards and false if it moves to the right& }+ r" s/ X" q" Z
wait-time ;; the amount of time since the last time a turtle has moved
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2 E4 F+ k `2 ipatches-own' a4 [/ Y- o3 K# T; ^
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intersection? ;; true if the patch is at the intersection of two roads
+ @- U' B5 p; o1 t: v! S' ~ green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 }) W) R3 V' P, h+ C7 s/ g6 Q
;; false for a non-intersection patches.
' C/ x& {7 h. E6 y) ?+ U1 l8 p" w2 V0 s my-row ;; the row of the intersection counting from the upper left corner of the0 `/ {( m9 l# i0 E4 \& o1 B! `
;; world. -1 for non-intersection patches.
# r3 m' t7 _+ o5 ~ e, F2 Z my-column ;; the column of the intersection counting from the upper left corner of the" C# a7 D. Q2 H1 Q% X4 J* [
;; world. -1 for non-intersection patches.& ]8 U1 O. L. h
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" h! |6 r$ D. w# Y auto? ;; whether or not this intersection will switch automatically.
* Y0 ~1 s5 E7 Q8 \2 c ;; false for non-intersection patches.6 Q5 U2 ]9 g9 v. H2 B' I8 s
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! m2 J3 U. F5 I5 d;;;;;;;;;;;;;;;;;;;;;;
; a4 f6 ^3 J2 m8 p;; Setup Procedures ;;4 ^$ g+ s/ h8 i% C# d/ r; F
;;;;;;;;;;;;;;;;;;;;;;
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" i$ Y4 r# d9 V3 {: z& T;; Initialize the display by giving the global and patch variables initial values.! v0 n! k4 \' q; h, y
;; Create num-cars of turtles if there are enough road patches for one turtle to
: [+ R& Z1 T I! y; B;; be created per road patch. Set up the plots.; {4 E. u7 G. G4 ]
to setup
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7 V3 p6 U5 J+ `& T setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
1 i; p, W2 I& B. {& E setup-patches0 p3 }! A e+ Z5 d
make-current one-of intersections
5 ?0 s" o! U2 p7 E, ]* U$ J& _ label-current
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set-default-shape turtles "car"5 Y6 r& L: p4 u1 h
* h9 k; x8 Y$ ?5 O; ]& _$ B if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "6 \. ~& a4 z3 D5 U
"road. Either increase the amount of roads "% t& n4 R4 Q, B# x" N* Q
"by increasing the GRID-SIZE-X or "
7 y9 x1 Z) t( ^) s: S) t7 M) g "GRID-SIZE-Y sliders, or decrease the ". ]) q, N9 O" C& D0 s$ Z' t* c" _2 C6 `
"number of cars by lowering the NUMBER slider.\n"
( `& M9 D& e7 U$ u* t "The setup has stopped.")) l% m2 V* k" K& r3 w# V
stop
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7 X, Y) S4 \4 x1 m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ f0 P5 Q6 P& a! N) j2 J; Y crt num-cars
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* L1 ^7 K' m! y" m& u setup-cars
, w0 O. `* ^2 ^ R set-car-color) D, b& m8 c6 h4 r2 x4 D
record-data' ~; F8 Z9 o6 W4 o1 e
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;; give the turtles an initial speed
|0 O( ?% l4 o' q6 ? ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values
6 H6 q" V$ Z5 u$ ^4 ^to setup-globals
* c/ Y b) ^8 G7 A+ X set current-light nobody ;; just for now, since there are no lights yet+ s/ ?8 D/ d/ K* g
set phase 04 `# C7 N' n4 ?# m) D6 \
set num-cars-stopped 04 }1 y& X7 A% ?& Q5 T1 o( @. q
set grid-x-inc world-width / grid-size-x
, o2 l {; x8 ?4 D' U; H set grid-y-inc world-height / grid-size-y2 X3 A- I5 F& t2 ?! T0 d7 O
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 K4 S8 P( F$ s( y# M5 B
set acceleration 0.0997 b0 Y, {' @6 y4 \6 Q" G
end3 u0 t5 C; W! N L/ Q3 K
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* |- P4 A: `( H; @( h! L4 s: H) y
;; and initialize the traffic lights to one setting' a# H. j) v ?2 B' M
to setup-patches( {( ~. y) R% L" o8 X
;; initialize the patch-owned variables and color the patches to a base-color
1 A" ~! ^7 k: X# J; l ask patches3 X# ~2 Q3 O K7 }* @! h+ a" @( ]
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set intersection? false0 N4 a& v+ M; m( h) w% Z+ }
set auto? false
! f: U; T" S9 ]( a8 y5 ] set green-light-up? true
: N) L5 t- r( h set my-row -1/ g; F: v- F9 X3 ]( z4 s$ k
set my-column -1
1 W, d1 J8 z2 l; z6 Y set my-phase -1. `! }7 i. w* E0 Q6 S
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets4 O4 p5 ?7 L& ] t! A4 P4 }' S0 v
set roads patches with
$ r) Q- M0 j! U! a) u0 `. N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' W. e% b! l+ v6 ^( ^' U5 G* v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% s8 @& k. `' D8 [$ s9 _+ i
set intersections roads with. ^! c" g; u* Y) }! q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; a% [4 R" ]: i& K; L
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) Q' G& x! O/ Y+ R1 J; i* r
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ask roads [ set pcolor white ]
0 D7 G( k- _2 ]0 ~7 Q. k+ b setup-intersections
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1 l7 f( e% R: t: r+ {" B8 B* D* J; e其中定义道路的句子,如下所示,是什么意思啊?* o: I/ |; G2 G. u6 v- S
set roads patches with
; Z$ n; ^: B7 p: P [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& }/ g9 W) P5 g2 w r+ Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% x- v7 Y5 I$ Z+ }' W( p" k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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