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[求助] 在看例子时有几个问题看不懂

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发表于 2012-6-20 08:59:43 | 显示全部楼层 |阅读模式
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 N; A& D& @; O! x& O- R  rnetlogo自带的social science--traffic grid这一例子当中,
' s5 R" ]  P2 U! `globals
# ~& X. |/ B% ?; G; L$ x. ?) j[
8 `$ ?4 b- }8 B4 D4 u. e. y6 C+ y$ x; P7 d  grid-x-inc               ;; the amount of patches in between two roads in the x direction: K0 r/ d  E. J+ X
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
$ `- @" C( a6 ]7 I  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
0 o4 h7 f# [$ u1 M                           ;; it is to accelerate or decelerate+ o) p( d# n! g, a9 G4 P
  phase                    ;; keeps track of the phase: ?2 Y$ H, H5 m% Z, t& k
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  t( n+ `2 h) P- K% h
  current-light            ;; the currently selected light
$ H% V) s/ x0 C. f8 b( h6 ^6 {  f' q; c$ S7 p2 U
  ;; patch agentsets& d  h" M! f/ C5 A( j3 u
  intersections ;; agentset containing the patches that are intersections
% y: l6 a- s  c" U; a, A  roads         ;; agentset containing the patches that are roads) `% s+ f% {: s& y# _6 U
]
0 [- x/ x# f, j1 }$ B7 d3 c( l5 T; _/ _0 d: Z/ h+ @# [  m
turtles-own& C' a7 T5 S$ S( K/ j
[# c# y! U! j; m0 ?5 m) z
  speed     ;; the speed of the turtle
* a7 g5 C2 D) E( w+ W+ X  up-car?   ;; true if the turtle moves downwards and false if it moves to the right9 r- A. l2 o/ g
  wait-time ;; the amount of time since the last time a turtle has moved) r) F& Y- U0 H$ `  p
]
0 y7 \5 `9 a, D6 k/ X% |. X+ T$ ^1 T: x! Q
patches-own* L: b9 j. `6 `8 U9 X/ @
[
% _  Z' L4 _9 M/ [$ z/ `- W  intersection?   ;; true if the patch is at the intersection of two roads  h; \7 ~+ i7 `8 o. f
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
" C% |2 t$ ?. \9 I" i3 Z. c/ a7 v                  ;; false for a non-intersection patches.% |* x2 i5 C( L8 M4 m
  my-row          ;; the row of the intersection counting from the upper left corner of the2 B1 k. M) g+ h! |& {  T, [
                  ;; world.  -1 for non-intersection patches.
' X% P5 e- Q2 ~% u4 I  U9 A2 @  my-column       ;; the column of the intersection counting from the upper left corner of the
$ }$ T+ @+ G6 z                  ;; world.  -1 for non-intersection patches.3 b" [. e* U2 N1 c2 y
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
$ I1 g9 K% Z6 I6 ~% V& K  auto?           ;; whether or not this intersection will switch automatically.
, _+ X# a, y5 N* z                  ;; false for non-intersection patches.& h' o) I4 e* b7 b
]9 j1 i% k. {& N) c) K" @5 n" _

. \& J% o2 E3 E6 [' r% O/ h9 @5 Z# y. S
;;;;;;;;;;;;;;;;;;;;;;
) U& Z; i* A4 U5 z: ];; Setup Procedures ;;, |" |% Z" |! Z( T
;;;;;;;;;;;;;;;;;;;;;;
# v- y6 i8 c1 ?  C3 N# i  C3 Q9 m$ X6 ?
;; Initialize the display by giving the global and patch variables initial values.
- u6 f) h: P' ~9 c; `; W( @;; Create num-cars of turtles if there are enough road patches for one turtle to
- ?- y- R6 ~- r* Q;; be created per road patch. Set up the plots.
9 [( S1 r" R6 Cto setup
( a, R; z5 T0 A' ^, |  C9 J  ca
: z4 o2 y1 o1 o, L( t& \  setup-globals
  N3 C& i" J2 a9 c; }6 ?0 |. b* [
  ;; First we ask the patches to draw themselves and set up a few variables; R, G! u, ~6 |9 v' I
  setup-patches) |9 u8 q9 \5 E$ \$ d- P
  make-current one-of intersections
) I+ y; |8 `' F  label-current
( u5 S7 K  A/ L6 c+ |8 o: o- H0 E2 A* A; z
  set-default-shape turtles "car"
  N' P  F1 q4 U3 [* S* _( G( y/ v! N- v/ D
  if (num-cars > count roads)
! J7 a/ @* V6 x4 h0 K! Q: ]0 R  [' n* l) Z1 y, V# ]
    user-message (word "There are too many cars for the amount of "4 V/ k$ U7 @/ z; y& P
                       "road.  Either increase the amount of roads "
) l# Z/ w' `3 c' j% R2 |                       "by increasing the GRID-SIZE-X or "% \6 x8 z7 \/ q' i1 t
                       "GRID-SIZE-Y sliders, or decrease the "& U5 m' P3 x0 e. e! N4 d5 t" `6 m
                       "number of cars by lowering the NUMBER slider.\n"
& o. _' N' ]- T. O) J4 O+ M# Q0 N- t                       "The setup has stopped.")
: V( H) F) i% A1 m1 [    stop
) J4 \# ]1 N. S; W, j9 D0 w  ]
/ M: j3 h6 a6 T7 k# l1 @" B, P6 ^# h3 }( D* _
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: Z6 @: o/ p( p; B) T" r# i5 s2 L
  crt num-cars
: t, A7 s# F) U5 B0 Y7 w  [" M4 w8 A3 m3 @! ?! j5 s
    setup-cars1 _( i  Z4 e: L/ I" D) {6 ~2 e0 ]
    set-car-color' _( [0 h" K- `& \, W
    record-data
2 }# B0 l. G4 O. q; k' i  ]
$ A0 d: n& t0 F+ C' b
7 t& v4 a7 {/ _9 V) K: F  ;; give the turtles an initial speed8 h; g4 v9 Y" W1 ~8 W. _6 F
  ask turtles [ set-car-speed ]
+ P; {3 h. m) B2 G# q2 H4 W( H) [! Z% R2 Z. {. }
  reset-ticks
* Y% I- o- o" o# U, j* Jend
  g- U" q  U9 ^7 K6 r8 e, X- M) w0 B( N' z- \- a
;; Initialize the global variables to appropriate values
, C+ ?& I6 I; vto setup-globals2 c# x9 |3 g8 D/ C
  set current-light nobody ;; just for now, since there are no lights yet  B+ @( M1 J. p2 T
  set phase 0$ ^( V4 z- p/ B6 E/ B& R
  set num-cars-stopped 0% f3 q, k' `2 E/ V- J$ P4 B- j
  set grid-x-inc world-width / grid-size-x
* i( ^! U! ^3 S! U  set grid-y-inc world-height / grid-size-y8 d& I* Z* K/ x1 \: `1 P

( e% @# t9 `5 @6 k6 Z  d  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) c/ x! ?6 Q+ R! \! k5 X+ D  o4 Q( P
  set acceleration 0.0992 s- Z5 m8 o/ l6 Z( |; s
end6 Z4 R1 n7 z) ~, g+ u

2 E, [/ Z9 a( W: _3 d;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& N, m' x" w( C( R! {2 D; Q2 ^;; and initialize the traffic lights to one setting
' T1 l$ L! o0 ?  W# H! }; \to setup-patches
7 I5 L( |0 I7 f$ b  ;; initialize the patch-owned variables and color the patches to a base-color7 T2 f! h& `. K
  ask patches' R: h2 C0 h: V1 R4 W
  [
% _* g% p0 G: y9 _    set intersection? false
! J: K7 l4 g2 V( |/ P    set auto? false
4 R+ C5 F  o( d9 d5 K    set green-light-up? true
% r; t4 D( ?6 [& H    set my-row -1
  P, h9 m& [+ Y7 E5 d( A# q    set my-column -1
0 o$ k& i" i6 L6 i    set my-phase -1
5 Q6 D7 v& Y/ z. W    set pcolor brown + 3
3 p. z6 b: L8 X) q# u* H# l" [' [  ]& e6 K5 K& i- G

0 A" ^3 m- ^0 y0 Q0 b/ S$ O  ;; initialize the global variables that hold patch agentsets
9 V7 S: ^+ I  {( A( l. I- ^" V, u0 }# ]0 j  set roads patches with
$ j' _3 D3 i$ R: r( i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% N1 N- D  T1 a7 V9 m2 n% t3 y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( k4 I. W* ^6 g; m) I: F' @9 P  set intersections roads with5 X- H4 H5 b9 M2 b, Z, y* E& r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* N- q( w$ F% r2 P4 B; M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ P6 f" E, a0 a3 ~* O* B6 D  Q9 ~( Z1 L1 G- g8 e
  ask roads [ set pcolor white ]
) ?. I" B3 F! q2 C4 @# f, M0 h* t    setup-intersections
; t4 ?+ R- z  A. ^# i: {, |. Aend
9 |8 z' }( t+ c$ j; V% d* g5 ?9 ^$ s其中定义道路的句子,如下所示,是什么意思啊?, F  X9 _+ B1 ?- m9 N! b& n: J2 j
set roads patches with( j; D) S$ F9 {/ f) X) i# d( F7 S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 L7 d, U8 a- h3 Q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 q6 t' k# c% R2 d
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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