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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。
4 {0 E/ R: M+ a) W% Z& ]netlogo自带的social science--traffic grid这一例子当中,
$ H7 \4 _8 y; t8 [( R: M; Q% jglobals" `0 v" [6 H6 |
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4 Y# w+ z. E# D grid-x-inc ;; the amount of patches in between two roads in the x direction
3 }( j' U! ? J& H8 h( u grid-y-inc ;; the amount of patches in between two roads in the y direction
/ l: K$ ^8 d" r; Y acceleration ;; the constant that controls how much a car speeds up or slows down by if7 G* e# u* R2 L7 ]$ t- e, |* b1 j) C
;; it is to accelerate or decelerate% s a& z2 q8 r( Z
phase ;; keeps track of the phase: r) {' M7 ]4 s# ~; P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: A) _+ e+ X( t0 O9 m5 D- _1 F current-light ;; the currently selected light
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' _" U5 D# N! I9 q& x8 ~, h' S, { ;; patch agentsets% R- e7 d# g* b; Z& I
intersections ;; agentset containing the patches that are intersections F0 I: @; X& {* Y1 _
roads ;; agentset containing the patches that are roads
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2 c) x4 V, A! r( R( s; Xturtles-own: N* O2 A1 F1 W1 L' P$ W; b$ a
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speed ;; the speed of the turtle1 f; }8 S1 F$ v% N' G; E9 ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right
. z, e$ e0 K$ f* n& p wait-time ;; the amount of time since the last time a turtle has moved
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patches-own( d& j$ h5 x& D8 h
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intersection? ;; true if the patch is at the intersection of two roads) s( P. _, [9 y2 y8 b
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' h0 k: W0 a& Q/ N" u
;; false for a non-intersection patches.
: m, o0 { D( V1 y* ?$ D my-row ;; the row of the intersection counting from the upper left corner of the: t$ C( L" w3 _* U4 Y) |( n
;; world. -1 for non-intersection patches.
4 w6 o/ U3 j- ~/ `: x my-column ;; the column of the intersection counting from the upper left corner of the
$ Z( U" [# \: b! c1 ? ;; world. -1 for non-intersection patches.5 d1 f4 T) m# F5 I" T6 w9 t6 ~4 O
my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 w! H" z9 ]/ E' f
auto? ;; whether or not this intersection will switch automatically.
6 J3 o$ V" _ ]7 `/ k ;; false for non-intersection patches.3 A8 S9 S( b1 Z5 V5 w; r2 Y/ P
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7 P! r; }, O9 _$ u' D# o' }& {0 [( @;;;;;;;;;;;;;;;;;;;;;;5 x; @- z, f$ x: ^2 u4 E z8 y: K
;; Setup Procedures ;;/ `+ E3 I6 m: j/ { D) Y
;;;;;;;;;;;;;;;;;;;;;;- Q; f9 j7 y" v3 @% g. ?2 o$ n
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;; Initialize the display by giving the global and patch variables initial values.
: Z* J/ u% \; k( W) v3 Z, [;; Create num-cars of turtles if there are enough road patches for one turtle to$ p2 J3 ~0 O2 I1 O/ {
;; be created per road patch. Set up the plots.
9 l$ J T6 |& w. d- {' y6 M+ E* Jto setup$ I. f9 g) t" }$ e7 |: g# s% C
ca
; U2 `6 G2 H- j& L3 ^( Z$ I) r setup-globals
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) X# N& y- f5 H& _& I1 ]9 k ;; First we ask the patches to draw themselves and set up a few variables
/ i9 ]8 Y$ G' a( w6 b* h setup-patches7 X, E1 W" g$ Q$ R
make-current one-of intersections: A2 J. N _- U) |% B
label-current
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# @5 ]. j$ R) e, s* [$ ]' t set-default-shape turtles "car"8 w7 k6 p7 b3 A' Y& Y, j8 l. s) u
! e0 a Y2 u$ p9 l if (num-cars > count roads)
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& Z; J0 D6 u2 ?1 U S! a; i user-message (word "There are too many cars for the amount of "
1 t# a% e5 |% X9 `- { "road. Either increase the amount of roads "4 ~' [/ ]( |: }& L: x1 J2 q3 D4 F
"by increasing the GRID-SIZE-X or "
4 I ?2 D1 k4 ~; | "GRID-SIZE-Y sliders, or decrease the "
# B' o S' O7 m t* T x. c "number of cars by lowering the NUMBER slider.\n"" u( z; I- G. r# d1 F
"The setup has stopped.")
9 H$ J7 D. B0 x$ W; y) y. s stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 ]6 a* }7 H2 l( v7 [: \
crt num-cars) v# s, `+ t! x$ i# I/ h5 ~5 V% C8 Y
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setup-cars: [* }6 d5 @1 J6 g) Y
set-car-color6 v4 x7 g* |& Y" J& _3 U9 v& k5 _
record-data
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;; give the turtles an initial speed2 E5 L w5 _8 y) V* Q
ask turtles [ set-car-speed ]0 e4 a7 G# z! Q' c5 F7 {. m
8 q, @6 @+ n2 T' @; C: M& ]* r reset-ticks
% M' i3 X7 B8 r. P) `end, [5 }+ S% D3 v% n0 p" `4 b0 _7 B
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;; Initialize the global variables to appropriate values
" l+ N# _& s. y% }* @ Pto setup-globals
, Z( M5 r: a% F1 r4 O4 U- ] set current-light nobody ;; just for now, since there are no lights yet: W: S* {# S# c) B$ S X1 b8 E2 q
set phase 00 M) H. P) |" I/ D
set num-cars-stopped 0% V5 C ~* M2 M) w/ v! J' ^
set grid-x-inc world-width / grid-size-x4 J( P3 X% i& h( n! e4 j
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 boundary4 B7 Z2 N* S6 j. f+ L: v+ M3 V- ?1 D6 o
set acceleration 0.099
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4 h. V' a2 f+ j" {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. N$ P1 V0 e: c5 l5 D. @. @8 ~
;; and initialize the traffic lights to one setting
: |6 D2 [; Q. {. s) T) h0 g9 Uto setup-patches
6 a" a* S4 Y& o8 X! S: q, L; V a ;; initialize the patch-owned variables and color the patches to a base-color, s/ ]3 z* ]# i% a0 K! N4 m
ask patches
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& z8 ]: L* t$ `- P4 B; X( E7 l set intersection? false9 K5 \: b) U6 ]( n% V+ [. E' d% x D
set auto? false9 V! [) O7 D' m+ E2 J
set green-light-up? true# M% A1 {$ U# K) o: n
set my-row -1
+ t7 R2 O# Z# J! a+ i; C- E1 L) X set my-column -1
% D$ R% ?9 \8 c/ \8 O- ?4 l set my-phase -15 e4 V8 G6 z, b6 ?# f; u& S
set pcolor brown + 3
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( W% a+ n5 ?! s( z0 u) ^ ;; initialize the global variables that hold patch agentsets& d$ o) h% x; {7 H/ S
set roads patches with1 U7 P; ?" V% p% D" U) w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# j# L8 n* W8 B( f4 k% M" R- h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 t8 t4 q+ q) Y2 @ R2 l. T
set intersections roads with. ~& ?* o& }: Z, n" E3 R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) I( e- r$ |! }$ A6 N/ `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' m9 L1 a1 ]- r8 D
. D a( a3 d+ f! S ask roads [ set pcolor white ]
* i& {8 C( P [6 I3 [ setup-intersections2 {- q7 i3 J; [6 H1 X, h
end
8 e4 [" B F( `其中定义道路的句子,如下所示,是什么意思啊?* ?6 y" H+ z4 y# u9 p1 Q2 F/ K
set roads patches with5 M* j3 v! o$ }& M& ^0 D( d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ d2 H7 N4 ~' U2 h2 n4 Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) X6 }5 v& H4 j& u- k- v" n
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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