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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。# W0 k8 Q6 ^9 m" Q
netlogo自带的social science--traffic grid这一例子当中,
9 W- n( P2 ~$ H* h8 s: sglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
^* }" \, v3 m0 O grid-y-inc ;; the amount of patches in between two roads in the y direction
2 w m9 \2 J5 ?1 q acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 }8 G- m4 T: e0 ` ;; it is to accelerate or decelerate
' r; Z# h- d3 R2 A( N f/ H phase ;; keeps track of the phase' {: r) N$ t& Z6 r
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure! [4 v' J+ G+ W8 j. U* m
current-light ;; the currently selected light
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7 @ t9 ~) D& D ;; patch agentsets
! X" L0 V, H/ M8 u! w x0 k intersections ;; agentset containing the patches that are intersections
/ d# ?- d w: @( s5 _. { roads ;; agentset containing the patches that are roads
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turtles-own
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3 h. f- U% a+ Y' ^ S- ]" _5 @ speed ;; the speed of the turtle! c4 _5 k% B8 t3 i7 V# ?: v
up-car? ;; true if the turtle moves downwards and false if it moves to the right
, Y9 q! ]+ @6 Z) a wait-time ;; the amount of time since the last time a turtle has moved7 E) b, X' J. v% M4 Q
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* D$ y# g2 b6 P1 wpatches-own$ q1 t( z) Z9 P
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intersection? ;; true if the patch is at the intersection of two roads
; v% h4 ?+ @+ L7 @7 F) V8 t green-light-up? ;; true if the green light is above the intersection. otherwise, false.
. Q$ O# i7 m/ r1 N3 N& Y" L ;; false for a non-intersection patches.. R$ m7 A: ?* o# X, P
my-row ;; the row of the intersection counting from the upper left corner of the. h3 |7 _* L4 `
;; world. -1 for non-intersection patches." ^5 J, _" o. D# U5 `
my-column ;; the column of the intersection counting from the upper left corner of the4 n1 \. l) J# o( l/ V
;; world. -1 for non-intersection patches.
. w2 x3 w4 j! ]' R5 l% g my-phase ;; the phase for the intersection. -1 for non-intersection patches.
/ m$ L! C9 k: m' l+ m auto? ;; whether or not this intersection will switch automatically." F3 ~& ~3 B4 t. q' {9 f
;; false for non-intersection patches.) W, i" t$ i+ D# L$ r
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4 K/ A) U9 C" {; R/ T N;;;;;;;;;;;;;;;;;;;;;;$ B0 L5 f( Y; a6 `, J
;; Setup Procedures ;;
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, M' A r) p8 {- ?" J;; Initialize the display by giving the global and patch variables initial values.
. N* z4 s* c3 ` v;; Create num-cars of turtles if there are enough road patches for one turtle to
$ t; B7 d1 c" |, ?;; be created per road patch. Set up the plots.
2 r8 g( F- ~4 I% e5 oto setup, d8 X9 l3 `' U2 ]5 ]# Z g
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
; A2 v! ?( P! }5 q* L1 q setup-patches
, p8 u; j4 @5 A% y) C, G make-current one-of intersections3 \( [+ N2 {( q) ]4 a: p
label-current
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set-default-shape turtles "car"3 B3 m) H, {" @9 x* p+ x
& ], U' D, R" h5 Z- l if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
, B @- K% ?5 D+ H; o) r; x, H* i "road. Either increase the amount of roads "
0 t# X9 N5 d- g9 _( X7 u "by increasing the GRID-SIZE-X or "# x; }4 h, W2 H8 N* L
"GRID-SIZE-Y sliders, or decrease the "' y+ v; G1 L; X1 E- Z
"number of cars by lowering the NUMBER slider.\n"
0 q+ X% {! N8 e/ i0 ~% O+ Z "The setup has stopped.")# m- U' y I J0 a7 ~3 q
stop( a/ [+ p3 f$ }% d, e! D" k) }4 x
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) `8 x2 k) Y1 @* [( j& R+ E& L1 G% p
crt num-cars
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set-car-color
0 M. S9 s9 c7 p& r* r) b; M [4 G record-data+ K6 W' m, U0 i6 x, d. Q% t
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;; give the turtles an initial speed! _& |' A d2 d
ask turtles [ set-car-speed ]
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- l x% U. W; M5 V2 u# k0 L4 q' U& r reset-ticks
+ u8 `) @6 g, e# d+ zend
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;; Initialize the global variables to appropriate values
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( {; c3 o! @; Y set current-light nobody ;; just for now, since there are no lights yet2 U6 d4 n; _ w6 }9 k
set phase 0* f* y+ Y% Q% |% g) H
set num-cars-stopped 09 Q+ ?; ]% Y* r* {3 P
set grid-x-inc world-width / grid-size-x8 |1 [# i! U( h- _# @
set grid-y-inc world-height / grid-size-y
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5 I+ H3 G# p2 Y# J( e ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' Y. L) h; H( t) S set acceleration 0.099. f2 W" a7 `) m1 w; N, ^
end: \( ^/ F n2 P. k' j# P& n
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 c$ h5 u3 r% F6 x9 W7 p;; and initialize the traffic lights to one setting
4 [& ~. f/ {" c5 m _$ Tto setup-patches$ {. n8 g& d& P7 v9 H- L3 v" X
;; initialize the patch-owned variables and color the patches to a base-color
! w% y6 V2 `. U. `# S ask patches% P# m7 Q" t: A" y7 ^8 R+ x0 [
[
$ c$ j6 m# `. ?6 ?7 ~7 y& v' b4 Z0 e+ u set intersection? false+ y( {5 J$ _2 U1 {! ]& ]( X5 _
set auto? false, P" k! f9 v. q! P) }
set green-light-up? true
2 ~% R3 |/ g: S% S/ G( q set my-row -1" f- z1 q" B8 i* X2 e0 [
set my-column -1) X b1 E1 O0 ?% K1 r
set my-phase -1
+ t: p4 S( b0 F: Y3 a8 K set pcolor brown + 3: q6 r2 K9 H, Q
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2 ~' n& s' ?, s; \2 ] ;; initialize the global variables that hold patch agentsets ~3 Z7 n; n3 X6 H/ r! D' t
set roads patches with6 n# Z' g' b, }, J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 ^% u2 s5 f+ P( P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 a. Q) H7 \8 W- N$ s
set intersections roads with
- Y$ l5 @: w9 J! P( j$ u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: T+ y$ J' U# U* W4 Q# F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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7 x9 H3 A4 [. a( l' ]% \1 u% o$ M ask roads [ set pcolor white ] Z& }& X" Y3 G
setup-intersections3 k: M) ?3 o: |: L
end* o7 H0 h$ t G1 Z& d
其中定义道路的句子,如下所示,是什么意思啊?
0 Y0 m3 K: y0 E$ T1 E9 w8 Q set roads patches with Y. ]! x# G0 ^5 e5 T @: \1 n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% F& q; _( L# k8 ? h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
H* ^" v0 L! e/ |$ m- v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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