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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。1 f: c( i! d3 c
netlogo自带的social science--traffic grid这一例子当中,5 [; D* ?! U: P" G. d% j, q' e- c
globals0 o. W/ i" C; s3 w) m1 [
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grid-x-inc ;; the amount of patches in between two roads in the x direction0 ]4 ~ m Y0 a3 v+ Q
grid-y-inc ;; the amount of patches in between two roads in the y direction
z4 J& h: [* {: g. y4 ^4 [' J1 o6 r; d acceleration ;; the constant that controls how much a car speeds up or slows down by if1 [: J; Y4 U+ k' |) T: ]
;; it is to accelerate or decelerate
4 \& L& o, m% O% F phase ;; keeps track of the phase
9 Q6 Z4 E+ l) [4 B num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* K1 F3 V" w. M! ^7 n1 ]0 S; d8 j3 L" c
current-light ;; the currently selected light! `" z% v% Y$ e4 B1 N# n
9 b: u" A: F2 g% V4 y, c ;; patch agentsets, k6 M2 J& x& S( ?( N$ }
intersections ;; agentset containing the patches that are intersections- ? L( I* y. U( Q
roads ;; agentset containing the patches that are roads
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0 n& ]: S/ E$ b: o$ g: mturtles-own, Z1 r' u7 g6 q; K
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speed ;; the speed of the turtle
/ j# z2 Y+ n! K4 X c up-car? ;; true if the turtle moves downwards and false if it moves to the right6 z5 f' ?* m, `8 H6 v9 J. M
wait-time ;; the amount of time since the last time a turtle has moved
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1 C6 {4 z3 G$ S. M2 wpatches-own
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$ @1 W8 C3 m( F4 ? intersection? ;; true if the patch is at the intersection of two roads4 Q) r/ Q, X) b Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* K4 O1 R1 Y( i# P( Y& ^ ;; false for a non-intersection patches.) _" m7 X& z) d$ ^
my-row ;; the row of the intersection counting from the upper left corner of the" F( x; z: w5 C, }
;; world. -1 for non-intersection patches.
* f5 _1 o& o8 X5 Y my-column ;; the column of the intersection counting from the upper left corner of the' _, H2 j; g9 @6 e {# a
;; world. -1 for non-intersection patches.
9 w" k6 G5 H% [ my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 {8 Q: h+ x8 u) ?
auto? ;; whether or not this intersection will switch automatically.
W- N B8 A+ D0 P; z0 N( o ;; false for non-intersection patches.! j( M0 M3 D3 U2 r( q$ J
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;;;;;;;;;;;;;;;;;;;;;;
3 J- V; D, ~% `' b1 e$ a;; Setup Procedures ;;' o+ a1 F, X' i- R0 J U8 Y
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;; Initialize the display by giving the global and patch variables initial values.$ o9 s! w7 J% Y6 f9 d9 Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 K" ]% F8 F( R: O) R8 L;; be created per road patch. Set up the plots.+ d' M2 o* Z. U
to setup3 O# f5 }4 O' _: p5 ^
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
( x8 G; p k7 n$ }3 Q setup-patches
# D. C+ E, z8 g- d; d% `- {; V make-current one-of intersections
# y& F$ v7 p; V2 r% [ f label-current
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5 a: [7 }* @5 Q) N set-default-shape turtles "car"
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if (num-cars > count roads)9 c2 w2 f% s8 Z7 v; X" a
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3 ~/ [& v( M+ F& b6 g9 k3 X user-message (word "There are too many cars for the amount of "0 ?# r# e7 f1 ]2 o" G$ I' i; A6 B
"road. Either increase the amount of roads "" w# V: ]. \: ` Y; M
"by increasing the GRID-SIZE-X or "$ |, O% F! C9 C4 B
"GRID-SIZE-Y sliders, or decrease the "! W6 Q+ p3 `. b7 ~$ d; b5 u. X
"number of cars by lowering the NUMBER slider.\n"7 N' w/ D# H# M/ q2 l4 F) B2 t% \
"The setup has stopped.")
) n/ R) X3 R9 c+ m8 B8 H' J* b stop4 ]' k D0 i" r* @1 y' G( ^' ]
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, {* q: P# I6 L) ] ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, I* @9 f2 D8 |" L; k- o# a N2 i! T
crt num-cars4 J# G) o* J4 a3 B f' B) ~$ |" j
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/ q$ w7 t1 u% @9 M& j9 a) z N# J setup-cars
& H: s3 X/ U; r set-car-color
8 Q5 a1 U7 `: J. g7 U y A record-data
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# R9 L/ [" z3 ?& h7 A/ | ;; give the turtles an initial speed
% T7 G, i) b3 @2 E( x* M9 A ask turtles [ set-car-speed ]
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% @1 j0 V+ x f- q5 ~ reset-ticks; }/ H. ^) M9 f7 G0 A( U
end# U* ~! T. l' P b# J( e1 H5 Y
: z$ ^. x t) W# Y- y0 ?;; Initialize the global variables to appropriate values8 o, \$ I/ _0 H- H; U {. q, e# W
to setup-globals
5 P# ^, I5 N# B9 A5 @4 K& k set current-light nobody ;; just for now, since there are no lights yet( [5 e8 J* R9 z
set phase 0
* m$ N3 ~9 l, f& S6 H5 x& n3 a1 k: L set num-cars-stopped 0$ V0 x4 {# D" t* @9 q- s
set grid-x-inc world-width / grid-size-x R9 S& Y) \5 \; M% r
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
$ B# b, a! p2 m! |" n9 f set acceleration 0.099! M3 b7 L8 U# k( a4 H) h
end" D1 R" A; m: B6 B# x
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 Q# J5 e9 r+ L7 ^/ b! v) ];; and initialize the traffic lights to one setting& r, C Q5 c. f* r, }6 j/ E
to setup-patches
9 C" x+ F- f: z' o+ h' Q2 { ;; initialize the patch-owned variables and color the patches to a base-color
( m( A! h8 x+ w- ] ask patches
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set intersection? false* }- N. ]7 `9 N/ Y6 Z2 T' f8 O
set auto? false
3 k |) j" ~' J. G6 M; A d set green-light-up? true
1 Q/ o) @! y) J. }; f5 e8 L2 o& q set my-row -16 U+ k a* Q! u" }. b: B' M
set my-column -1% R5 w# h2 ~5 C
set my-phase -1
4 a2 U" `6 c' Z7 ?1 N' d set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets V$ w, _# x U4 N" L. G. \ \* x
set roads patches with5 J# C% |/ W2 ^1 C* q+ d4 m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 W+ @5 b, [, @" P+ x! p (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 u' U1 V$ ~- v! j; P' Y set intersections roads with
7 O7 b: E) D9 l% X( }& y; d8 j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
8 @' e( Z" l5 j% R7 z% ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 q) H& M6 R7 U9 G/ o6 |$ |
G) B! C" K: @5 m1 x% G# x# } ask roads [ set pcolor white ]
5 x v' d7 A% \+ u1 W9 \; m setup-intersections7 |. B$ C/ V+ Q7 _0 F
end
; c+ E/ @) L4 t* z# l! c7 {其中定义道路的句子,如下所示,是什么意思啊?
& i9 [0 _: g# m. t set roads patches with+ Q; v# x, k; |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, ]. p3 t" K; d, b1 p/ {+ h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 I+ V7 u& M# _5 z: R/ Y
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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