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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。) K, b9 w* O. K8 {' I
netlogo自带的social science--traffic grid这一例子当中,. l. d* w \! e6 l+ `2 [
globals/ M' ?1 h: p0 E$ K& r
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grid-x-inc ;; the amount of patches in between two roads in the x direction
) W; g5 _& o$ R+ u$ P3 d grid-y-inc ;; the amount of patches in between two roads in the y direction
/ {2 |0 N% b5 U$ S" K. k4 ~ acceleration ;; the constant that controls how much a car speeds up or slows down by if
" |& V) c% O' L" s ;; it is to accelerate or decelerate
& v( B+ G% I9 ~+ c phase ;; keeps track of the phase
0 n( I" A7 ~: W) ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure1 B2 \. @1 j& @* `% y y# I
current-light ;; the currently selected light
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1 J1 A: D$ [/ ^* V$ a' _' O% ] ;; patch agentsets
, b# D7 m! H- |4 [" m8 g, f intersections ;; agentset containing the patches that are intersections
) V( [7 |6 w* V8 b! O2 C roads ;; agentset containing the patches that are roads" W& F# i) ?/ i2 B7 n( ]
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$ ]5 q+ a" q1 zturtles-own
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" u* w: i3 u$ f8 N speed ;; the speed of the turtle" _: C4 [3 f* {; n3 J' w+ F
up-car? ;; true if the turtle moves downwards and false if it moves to the right, i2 \" s2 O$ E
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own) E, D6 n3 U7 P, }: G9 l
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intersection? ;; true if the patch is at the intersection of two roads, F, A+ s# e! c) E3 D1 Z) ?* _/ p" ^
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 e- J4 {5 T7 x( T2 L! a: ?) |9 |$ v ;; false for a non-intersection patches.
1 C% d& U( y/ b1 F- y& Z0 v( ] my-row ;; the row of the intersection counting from the upper left corner of the
9 P/ @2 I3 p/ o4 K3 a6 @) j, { ;; world. -1 for non-intersection patches.: d0 p6 f2 y7 g# P
my-column ;; the column of the intersection counting from the upper left corner of the
7 s/ w& U' h5 d9 _$ o8 ` ;; world. -1 for non-intersection patches., f. p( l7 q# g( l# @9 @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 h3 n+ Y' D' t' i4 b+ m auto? ;; whether or not this intersection will switch automatically.4 |/ y8 ~7 ^7 n4 J
;; false for non-intersection patches." h- f3 j5 r# ^( n( m
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;;;;;;;;;;;;;;;;;;;;;;2 k3 q8 Z; D& u: q1 N) M
;; Setup Procedures ;;# a3 D- }3 Z9 ^' K8 B# ^) ]* v
;;;;;;;;;;;;;;;;;;;;;;
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7 { H1 B$ L+ m. Q5 [6 \;; Initialize the display by giving the global and patch variables initial values.
4 P: j" z' h% Y l7 y;; Create num-cars of turtles if there are enough road patches for one turtle to
" q' }* n3 ~! j. n# z2 i;; be created per road patch. Set up the plots.
$ n! k9 B. d) J: lto setup
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, l0 r; J& V! F/ e# B setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
1 a. ^2 M- ~# c) S* r% V setup-patches# |6 T7 H; y* c @% m8 \4 Z6 v
make-current one-of intersections
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set-default-shape turtles "car"
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* {! ~6 E! L# Y# l1 e0 k if (num-cars > count roads)4 X! L* Z7 ?, r4 N9 Z
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' B9 |, F% }% b7 o user-message (word "There are too many cars for the amount of "
+ J8 p- L' K- H R5 A "road. Either increase the amount of roads "2 x7 z" M" B: ^9 z
"by increasing the GRID-SIZE-X or "
% I: d& _8 L; W! _; q2 m$ { "GRID-SIZE-Y sliders, or decrease the "
& u# e# s1 m$ s: Y8 |% R: _ [ "number of cars by lowering the NUMBER slider.\n"
I1 _& ?3 I* ]2 A. m3 O) R "The setup has stopped.")
/ u) D5 i; T& g% t: y. M$ ? stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# j/ C7 O; |7 b crt num-cars
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setup-cars
2 W2 ~, C! p0 c set-car-color: U" n7 m8 S ?; x
record-data1 ^+ i, k2 X( x' C, N5 R4 x
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) Y4 Q( I/ p9 j2 i ;; give the turtles an initial speed4 T, h$ v7 V/ C$ e% O; z0 q
ask turtles [ set-car-speed ]
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3 N4 e7 F. Q# X" Y6 R reset-ticks
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;; Initialize the global variables to appropriate values
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1 O2 R5 ?/ {4 \, ]- I set current-light nobody ;; just for now, since there are no lights yet" I& z+ R1 m: b2 {! K+ P- h
set phase 0. h0 l: C/ A4 e
set num-cars-stopped 0
/ A7 z# K) t7 w! O8 d8 \$ X set grid-x-inc world-width / grid-size-x7 S- I/ c) k" S) m8 {
set grid-y-inc world-height / grid-size-y
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7 J! X4 \* U( D3 G8 z. z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% j) G ~% ?& g2 I
set acceleration 0.0990 @6 U, w. W; G( o) @* R8 k
end
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& t( O* e Y. G( w' q4 w8 x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 ?5 J: J5 N$ l) q
;; and initialize the traffic lights to one setting
7 o3 F( R$ k6 s- lto setup-patches
& r' g0 v/ H9 ?- F1 Z6 t; O ;; initialize the patch-owned variables and color the patches to a base-color4 t' p& p3 q7 p T; {/ O# l
ask patches
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5 ]5 \( Y3 m) S set intersection? false
& }9 B$ f7 N/ @: S0 ?( |$ i" N1 _3 O set auto? false. g8 Q: ^+ b: F: e) Q
set green-light-up? true5 s2 G7 a& g8 Z/ C
set my-row -1
4 l/ n% r$ z6 V( u% P set my-column -1$ P9 ]4 V$ _- `6 u3 `
set my-phase -11 K0 i" x# p' ]
set pcolor brown + 3
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9 m% I7 B) Z B ;; initialize the global variables that hold patch agentsets
|) w& w& @" b* j6 J; C set roads patches with. I' b& g1 m1 w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 Z! J2 h* i: d6 n9 G1 f' n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 k8 [' a( O3 t
set intersections roads with1 j; y* s' @9 h6 a& b2 z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# T! P2 V% k1 k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
% k0 A4 ]1 i: c& z; _其中定义道路的句子,如下所示,是什么意思啊?8 {. e% _' _+ J) {" ~
set roads patches with$ ]+ x+ R% I: }4 M: X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 a, X% c/ Z, _& W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( J# C4 t3 o: t# i% c
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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