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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。) A# p/ p5 H& m
netlogo自带的social science--traffic grid这一例子当中,1 X' S. i; i% b+ i5 d
globals
* a# A1 O% y- u[
% |" X4 K4 l" H: {# e" h  grid-x-inc               ;; the amount of patches in between two roads in the x direction5 x8 Y. ?. m, N+ N: H/ V
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
+ `' J7 y5 |6 w7 ^% j  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; y! I1 a$ L' ~9 d- s                           ;; it is to accelerate or decelerate: \3 x3 S5 l& z' Q% r7 i. K+ }
  phase                    ;; keeps track of the phase- s1 p! J1 o( F1 a* a
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, h. j$ L* {# E9 K1 n  current-light            ;; the currently selected light
" C7 m9 O: J' N- j6 s' }% ?# ]0 Y
  ;; patch agentsets
, S. U! V! j0 |. Z1 ?% n' |  intersections ;; agentset containing the patches that are intersections+ I/ L* e7 F( K! z4 t8 @7 v/ q
  roads         ;; agentset containing the patches that are roads
# i6 V% Z; k/ O) Q" Z2 q3 _! r]/ B# f" h3 H+ j* h

- A+ S2 Q4 h% r) |$ v+ rturtles-own- R1 x; a$ \5 Z* F+ S& i0 ?$ A4 p! |
[
0 |3 @  H& V% ~  speed     ;; the speed of the turtle
$ C! \- F6 B& P" m8 ~  up-car?   ;; true if the turtle moves downwards and false if it moves to the right/ ~% H' f' f$ u( r5 U3 ^- F) c
  wait-time ;; the amount of time since the last time a turtle has moved7 k* X2 F9 Y; c6 a7 Y2 {
]- X  w/ w" B$ s# k- W6 Y$ t
+ d  J* `# |; J, G
patches-own, z" c) i8 S2 c
[
8 u. c: m! b2 t. l+ Z  intersection?   ;; true if the patch is at the intersection of two roads
, K- l5 ^/ Y# r% @$ A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 ]. p3 a6 ^5 J; x' s4 l                  ;; false for a non-intersection patches.
* H# z7 n$ I8 a6 s/ N  my-row          ;; the row of the intersection counting from the upper left corner of the
( e% X! j4 s/ @8 s6 j8 }                  ;; world.  -1 for non-intersection patches.
6 t) w2 X& p: a  my-column       ;; the column of the intersection counting from the upper left corner of the
7 s. E4 t5 a0 u* ?                  ;; world.  -1 for non-intersection patches.0 G- K0 ]0 u6 r
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* W3 Z" k0 `6 V& Q- D2 Y8 ^" u
  auto?           ;; whether or not this intersection will switch automatically." z1 h6 [: _( o2 C/ l( G
                  ;; false for non-intersection patches.7 `/ H9 a! m1 x
]
& f) V# c7 G& c' w6 ^
' I" ?; a9 |1 z: ~/ B4 G! r
) V  g; u9 h) G6 Y; n( v;;;;;;;;;;;;;;;;;;;;;;
: d/ h, t. |) ?+ k& [: c;; Setup Procedures ;;
  T9 L2 J* L+ K. p;;;;;;;;;;;;;;;;;;;;;;
) t$ `5 J8 c7 B, o8 t
, L( h* x  y  ^/ R* R: a; i& `7 k;; Initialize the display by giving the global and patch variables initial values./ |% `  S7 `3 e( _, h; `
;; Create num-cars of turtles if there are enough road patches for one turtle to# ?, ^1 @5 k8 `8 w$ \0 u7 E- K
;; be created per road patch. Set up the plots.2 o; n& t/ _8 ?4 c
to setup
2 y! D2 ?9 ]2 Z& A1 S! Q6 P* v/ ~  ca+ i* ~3 s2 U  h8 q# Z
  setup-globals
% @1 t7 v; |5 E( f( a5 ]
4 ~9 Z+ _! F+ f# S4 n  ;; First we ask the patches to draw themselves and set up a few variables
9 B8 f& [9 ^7 I) {  setup-patches8 r5 h$ @, S/ [5 U! }/ @
  make-current one-of intersections3 D0 }0 a% B2 Q
  label-current
6 N# L6 K) N6 a) |% a
( L- o, f7 `) A! g  set-default-shape turtles "car"
8 d7 B6 @" O" K7 v. ^- M" q5 q2 d
% z/ s* ^1 n. f( ^$ f; D  a  {. T  if (num-cars > count roads)6 J5 f& e; w0 @3 f  _. Z
  [+ E7 D8 v6 ?+ B# w6 \' j  X
    user-message (word "There are too many cars for the amount of "
" V% ~. Z8 ?  F8 A  o                       "road.  Either increase the amount of roads "0 v9 z, r. W& T0 h8 v
                       "by increasing the GRID-SIZE-X or "
( q' x4 t5 _) ^4 T  {& y4 G* I+ J                       "GRID-SIZE-Y sliders, or decrease the "4 F% @: ^8 i4 A( `/ q
                       "number of cars by lowering the NUMBER slider.\n"
0 K* {- l5 [! {/ v. K; w                       "The setup has stopped.")
6 A' ^$ W4 J# v& k! g    stop
- D! T9 n; `$ M, _( Y: n  ]
3 C0 S* t3 f, U0 {% |* ]+ T) @& S$ `
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 R) X: |4 ?& S8 o: c  crt num-cars3 l% B3 P! t  Q* d
  [9 |3 k* j: r% V
    setup-cars
) q. J9 ]5 K% ?    set-car-color
3 R; i+ S& k& K4 x0 T# {    record-data% H: m$ O; q, t- S' N
  ]  X/ l4 q6 H! G, B: Z

  @# r% K0 p: W  E1 ]8 g: x  ;; give the turtles an initial speed
) W) I6 }9 E' s3 T  ask turtles [ set-car-speed ]
) g5 Y( e$ F& ?6 ~: E, O  }+ t2 h
. e: T( ?: ]7 z  reset-ticks( k+ u  B$ _4 _! c: A7 C
end
* f$ v, \7 V6 a# S6 |) a) t
, Q" D$ Z- o5 k2 u+ E$ N;; Initialize the global variables to appropriate values
/ P4 z, K* P3 M( C# F' \to setup-globals
; m& B  L! m7 K) r3 t6 z  set current-light nobody ;; just for now, since there are no lights yet
. T* y8 a# y- |. i  C) R  set phase 0
! f! H& ^( [% y5 y  set num-cars-stopped 0; @  W) R0 I3 D
  set grid-x-inc world-width / grid-size-x
4 D6 g, }3 G, a. \( R$ |  set grid-y-inc world-height / grid-size-y) b$ Q3 Z/ Z, v% j# V
/ ?$ C- ?! a0 m0 `! X5 G$ ]; F" J
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 a5 j  P5 h+ M2 E/ I$ }: T: u
  set acceleration 0.099
  Z7 \* L+ E: i4 n. Zend! ?  r" n0 I3 R" `0 _

' r( P5 l. x9 f. r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 @, |& {$ ]! _) n; F- N4 A2 j
;; and initialize the traffic lights to one setting
; Q, O- T; R+ @to setup-patches
* u' |% t5 P# t1 y  ;; initialize the patch-owned variables and color the patches to a base-color1 w. [: `: Q' N- N
  ask patches6 Z% P7 U* b! R. P! W( l, A
  [( B( S  Q2 m# }" v9 d) u# k& w
    set intersection? false2 c% y( d! _7 g& e" l
    set auto? false
* Z! p7 v* o7 n; e9 ?    set green-light-up? true
1 g, N1 q; T+ ~! r' S. |    set my-row -1: ?5 A: ]/ Q  {* X% I9 @2 D
    set my-column -1
: l# ~! s" r, T) F2 b* P7 C    set my-phase -1, k! a6 V* S  z. Y1 O" U% H
    set pcolor brown + 3
! T. f$ R4 V+ n. k/ c  ]
% `2 c+ R6 [  w3 |( |! R7 |# ]  F& t9 C
  ;; initialize the global variables that hold patch agentsets
# d% \: p* X7 d- }" c  set roads patches with
/ ~" K6 \8 m6 `0 B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" O) Z( m/ v) e# A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 F" R  `/ x! I! `  set intersections roads with
4 E' H  H3 v9 O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, G$ ^" s' r! d# s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& @& k' y. s# {+ Z% H: c
# n0 E' Z( Y% r; ^3 k9 G" B" s
  ask roads [ set pcolor white ]
6 x$ s3 F& _  S/ t9 @2 |4 ]    setup-intersections/ q' t* t! {7 m$ D$ r4 ^( L+ C" p
end8 S4 d6 }8 P5 r, f% B
其中定义道路的句子,如下所示,是什么意思啊?) l, I: O$ C* a7 x* k( w
set roads patches with
, W. {  Y- {* D5 z" O" `# d- f    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& J2 Y7 [+ o7 f7 E' K2 ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, @7 i' @' T' g1 \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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