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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 n1 u/ Y8 A% u* P$ inetlogo自带的social science--traffic grid这一例子当中,3 E0 G' Y8 |( R
globals
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' _' _$ f6 X) I' X; y grid-x-inc ;; the amount of patches in between two roads in the x direction
3 u* V" _+ ^. [4 y grid-y-inc ;; the amount of patches in between two roads in the y direction( V X+ `3 ^4 V$ _, n
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ P. _3 v8 n: q+ v1 g# ^) r
;; it is to accelerate or decelerate
8 d7 G1 b& P5 N2 ]1 }2 f# E phase ;; keeps track of the phase
- j; r, U2 B% N0 x5 p) R num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# E6 h# }2 z9 V9 Y3 [ a6 P: T
current-light ;; the currently selected light
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;; patch agentsets
4 k& O; G6 _/ A. r( n intersections ;; agentset containing the patches that are intersections
( P9 |9 B4 ~5 t: J7 e* P9 u roads ;; agentset containing the patches that are roads7 O) u! M e( s/ t
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- s2 A! S' v7 I1 G2 D1 \% q* yturtles-own
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" p w+ v" }1 O9 ^) g6 m7 S% A+ h speed ;; the speed of the turtle" D8 n9 b' n8 Q2 O
up-car? ;; true if the turtle moves downwards and false if it moves to the right* @ {0 q9 M& ?# Z, L5 `0 G8 |1 N
wait-time ;; the amount of time since the last time a turtle has moved# ` J. J* b$ s/ f
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patches-own' a/ z' t9 f& G! D+ o
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intersection? ;; true if the patch is at the intersection of two roads
, Q) I$ l+ O# h. h1 } green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) P9 p! j( w9 A" e ;; false for a non-intersection patches.
$ R% ?, E/ V/ Q2 S my-row ;; the row of the intersection counting from the upper left corner of the
- G2 N: D# S. L! L" H6 E' G; q% A# q ;; world. -1 for non-intersection patches.
4 U, h$ o- F, f* W my-column ;; the column of the intersection counting from the upper left corner of the9 e6 T# \, @, \3 Q% c& y, w
;; world. -1 for non-intersection patches.
& i; X3 S+ Y5 Q( V9 n5 C my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ d1 p |1 {! c% t2 H S. u' c: k, V auto? ;; whether or not this intersection will switch automatically.
! [9 B' x2 z8 J6 i ;; false for non-intersection patches.7 a- z" t( J9 j
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;;;;;;;;;;;;;;;;;;;;;;
! S; _; [! g5 e0 A: ~;; Setup Procedures ;;0 @, ~" v. T1 z, `
;;;;;;;;;;;;;;;;;;;;;;- {: v, C5 X5 A( U3 Q8 n, ^0 r
9 s+ K+ j& f6 W+ h! @6 J;; Initialize the display by giving the global and patch variables initial values.2 T2 [' e8 Q# _8 ?, A. n3 g% l
;; Create num-cars of turtles if there are enough road patches for one turtle to+ L0 E3 ^/ W8 k6 `3 P5 u
;; be created per road patch. Set up the plots.
2 y& @, r e" {to setup: @+ Y1 P' ^0 N9 g
ca
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( W4 ^# {; M1 ]! U ;; First we ask the patches to draw themselves and set up a few variables
/ I V& |9 L$ V$ D3 Q) ] setup-patches
4 }/ h3 _! r3 V; V! y# `5 L2 m make-current one-of intersections; C% N; c! B0 A0 M
label-current0 ^% @, w4 L; m
6 \! J2 d' g6 X* [ set-default-shape turtles "car"9 U& C4 _/ ?5 d
6 \; x2 e+ o, ^4 _ l3 X7 {+ Q: f if (num-cars > count roads)7 {- O: R3 { K a: p
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$ `' N* a0 o& q, t user-message (word "There are too many cars for the amount of "+ s7 V) c' e3 `
"road. Either increase the amount of roads "
; ~ M+ _/ c% r- J7 h% I( M% u* Z. n' d "by increasing the GRID-SIZE-X or "
8 k/ T0 J. I1 |3 E) N. O0 x "GRID-SIZE-Y sliders, or decrease the "
6 z0 E8 ]7 ?; x0 B7 H. a "number of cars by lowering the NUMBER slider.\n"
W1 \/ k6 d6 q b5 y "The setup has stopped.")
1 W3 s }1 ~9 \6 q: T1 { stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars
# t5 V6 I! A6 G+ O! M: c set-car-color6 H6 `1 f; C! v0 D
record-data
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;; give the turtles an initial speed# ]. }6 s" E7 B* r% p' o# R
ask turtles [ set-car-speed ]5 U2 |8 @9 [' ^+ u. F# k
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reset-ticks
- l) z: ` J' N7 h# ~end
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;; Initialize the global variables to appropriate values8 G+ \9 m3 D# u& T1 E$ E6 b1 x
to setup-globals0 R( D9 ^3 K) w) ^$ M
set current-light nobody ;; just for now, since there are no lights yet
1 _" a$ X1 o$ o% c# G( ~6 `" Z set phase 0$ i' N$ @7 Y% F% ~ Y, X
set num-cars-stopped 0( c! m6 S# x& V5 O4 I+ K
set grid-x-inc world-width / grid-size-x, M A+ i( S. h2 I! l/ c$ @0 M
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& ?/ D$ D9 G" e3 B& W/ D
set acceleration 0.099$ _# f6 D7 N) C* I+ q
end. T& r! @1 G# v- p) i& E" g4 b( ~
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" i; Z" [4 G( q5 m;; and initialize the traffic lights to one setting( U# E9 P* T" c- F3 ]$ y' P
to setup-patches6 \, Q$ l4 E; d/ {, M
;; initialize the patch-owned variables and color the patches to a base-color
7 ^- ~1 U. ?; C8 f+ n$ B7 R. j ask patches
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set intersection? false4 [3 P! Q+ B$ {" w9 U3 H( \( ]* c
set auto? false. \: k( I7 p$ P e
set green-light-up? true O5 }# f1 z" c( y8 R1 ^& k
set my-row -1
6 D) {& P2 _$ X: n. } set my-column -1! d; Q: r8 O8 j2 H. X% j4 F
set my-phase -1
% P6 D# ?+ \# n- A. w3 U set pcolor brown + 3
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1 g9 h0 S4 k$ a ;; initialize the global variables that hold patch agentsets1 F3 ?& \% |2 X0 G! @9 @& t
set roads patches with# S4 p2 l* o9 E* S% o& F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: q" f* v9 \9 I) Q/ h2 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ v2 i4 Y: v5 d set intersections roads with
6 f" c' c& H7 c! |8 _" h$ l0 h7 j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 `$ w+ N- L( ]- O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]% P3 R- v9 x v( j7 \7 S9 i: k2 |
setup-intersections+ n; J- M& f8 h0 k$ j% U
end# z$ D A/ F# j+ b
其中定义道路的句子,如下所示,是什么意思啊?8 [6 \$ G* v9 R! x/ n
set roads patches with) w/ M/ D- G5 c2 g2 m% m) }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 s9 y7 i1 y5 Y9 o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ c# a6 x5 X7 e5 F; N) a
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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