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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。
8 w5 z$ \4 m6 `2 v, g# l% I* z! F9 Jnetlogo自带的social science--traffic grid这一例子当中,2 n6 G5 N! M0 X/ |
globals
' j2 S% n# v, T& Y/ b[; T! x0 x% b! D5 J
  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ u& w& M$ x. n2 z; H1 O
  grid-y-inc               ;; the amount of patches in between two roads in the y direction& Z2 ~, F1 a$ G0 z/ Y* N( J0 a
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 j8 |" ]: a. D                           ;; it is to accelerate or decelerate2 L; |+ H) j9 b% q& C! H, @
  phase                    ;; keeps track of the phase+ _0 {7 ?2 s+ |  t& o
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure" K8 L% f6 B/ ]. n$ v2 K4 \
  current-light            ;; the currently selected light8 J" q. T+ @( F9 }# N6 L

. E8 r& o1 G- r/ \7 H  ;; patch agentsets* w7 L7 [1 f  [% n4 }3 ~
  intersections ;; agentset containing the patches that are intersections" X7 ?5 n* B- d+ O6 E8 _) G* U
  roads         ;; agentset containing the patches that are roads6 C8 N6 x' _2 [' V) v; s
]4 U4 p  o2 E# x) G8 C5 o* i8 }

  r0 A9 p5 s, Q+ `: Jturtles-own
' `4 [3 M0 p& v8 |8 k[
- H4 k9 _; ]/ u; w! m2 F0 t  speed     ;; the speed of the turtle
$ p  B. b# B" J2 n2 n$ ^' U  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
# d) P& B+ V9 f# ~- a+ {6 C  wait-time ;; the amount of time since the last time a turtle has moved& E' Z  W# d" o- D$ ~9 U+ J' e
]
& @" M% H0 Y4 H7 V4 Y9 P
6 b) N, R# ?7 X* D, w" F- ^patches-own
) \! A* {) @2 C4 z1 k[
% q. U$ M4 o/ @% g& d6 n! T/ k  intersection?   ;; true if the patch is at the intersection of two roads6 s; w' z% h9 c9 k( k3 s, J4 P
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.3 e, W: Q& @8 H! G) C' _; }4 @) e8 F
                  ;; false for a non-intersection patches.. M7 @* z$ ]  L1 e1 T
  my-row          ;; the row of the intersection counting from the upper left corner of the+ d! ^; a5 h# @) m( ?0 ^
                  ;; world.  -1 for non-intersection patches.% ?5 }- D+ r. F: d( B: m; v
  my-column       ;; the column of the intersection counting from the upper left corner of the
7 n/ J9 m5 H; A1 M. a                  ;; world.  -1 for non-intersection patches.
$ o" Z1 t$ z' g; X; w5 k  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 w  c: U- [6 F# o1 l2 x/ D; ^  auto?           ;; whether or not this intersection will switch automatically.
7 W, ]+ U- w& V* c: S                  ;; false for non-intersection patches.
3 T( A8 R; K1 X$ ?]
0 y2 K, H$ j" r- }# z# p5 P& O6 t) j0 ^, {; N$ w
9 x4 w# L" o- q
;;;;;;;;;;;;;;;;;;;;;;* i* k' H5 H3 h; P- z0 a
;; Setup Procedures ;;
4 m( G& a1 r& {' u. E* j9 `% E1 [;;;;;;;;;;;;;;;;;;;;;;7 q8 l# t. M) v' _+ h8 {) V( D

- H3 l! _" G" I( z, j;; Initialize the display by giving the global and patch variables initial values.$ g3 a+ T/ M% B9 X; @, V+ w
;; Create num-cars of turtles if there are enough road patches for one turtle to
0 i) t% I$ A8 y4 O;; be created per road patch. Set up the plots.
9 W  W  |* m+ U( H8 T8 q1 gto setup6 q  c5 ~( q1 Q1 N* d! Z
  ca9 i7 S& _; A, D( ~$ N8 M, C& U
  setup-globals/ l* X- e4 B2 \

) F$ a5 i3 }" T9 q+ |& t5 ~  ;; First we ask the patches to draw themselves and set up a few variables5 N) b. T3 t) h; a8 D, O
  setup-patches) h& L5 j; Y- c
  make-current one-of intersections$ D' d, j# C9 ~' ~' F
  label-current4 N; _" Y- S, m$ \2 v7 X1 z

9 N6 |( Z0 n' I% T$ j  set-default-shape turtles "car"( a" A8 ]3 g/ w' P* y
+ c" p$ x. i+ M; K( N& s/ l
  if (num-cars > count roads)
- N7 O. P! T% ?  c, r  [4 d1 W& O) s( W- ]# Q7 h( J4 ?
    user-message (word "There are too many cars for the amount of "  S# n, J( X( \
                       "road.  Either increase the amount of roads "; A3 O* Q6 u) E- k
                       "by increasing the GRID-SIZE-X or "( R* u, P7 V0 Z8 U
                       "GRID-SIZE-Y sliders, or decrease the "
0 G. I" Y# M7 o; o6 L# T: ^: p! r                       "number of cars by lowering the NUMBER slider.\n") X" w' o. D$ L6 Z' e7 c
                       "The setup has stopped.")
  x( Q9 a- c6 ~' G    stop
8 j. e4 _& h. c  ]
1 Y5 r1 d/ }( M8 P8 F( z' n9 c3 k& c+ t4 g7 v5 ?
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* s$ ~( P* g9 P- E) p$ v; o
  crt num-cars
* s- b4 `5 Y3 L& i' u! K: l  [
7 V6 C* v8 d6 S' [/ J9 Z    setup-cars
$ ]$ E* W. k( G4 }$ _    set-car-color
, D" q" w# r! C& W2 |8 \5 W    record-data" H3 Z% [/ e; g9 c# ]  _* I; k
  ]: g$ b9 ?5 `9 j5 ~

( a. x' S# Z2 ~1 e6 D( m8 }& t  ;; give the turtles an initial speed+ G2 h  H) j4 [8 ^5 c
  ask turtles [ set-car-speed ]' g6 p, v3 S2 p0 u4 d; |+ c
/ |4 A% f4 ]) q
  reset-ticks: @# N/ ^% Y9 i% G+ g! `
end
- p3 S9 @& j0 l9 H$ ?7 S# g/ `( u) P% p$ G9 A
;; Initialize the global variables to appropriate values' `. O% G. J7 D6 H$ w( t
to setup-globals
/ K5 O$ }- {8 J1 ^  set current-light nobody ;; just for now, since there are no lights yet
# V! ]4 p: Q8 x) K' m1 Z' |# Z4 c  set phase 0. T' t! i2 u+ [. \" \
  set num-cars-stopped 0) H- b% ~2 [- Z! j
  set grid-x-inc world-width / grid-size-x
! g& B) Z4 o9 I, s+ N0 v  set grid-y-inc world-height / grid-size-y3 Q2 w0 W) N$ \! Z

+ K+ ^6 R4 F0 _) s6 k7 m  E  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# n& b- _: f, q8 S& ?: R  set acceleration 0.099( s; l" g# \3 v% ~7 f
end* Z6 S1 e+ [: N0 j8 {5 v

' ~6 A) t% X7 [, ];; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 G# J4 K& A4 `+ d;; and initialize the traffic lights to one setting
3 q, m% V1 ^2 e$ }- Bto setup-patches
3 N( ~8 r  v2 X0 l4 h; h  ;; initialize the patch-owned variables and color the patches to a base-color; i7 w; f+ f- ]3 `5 f
  ask patches
' u# G/ T0 l$ h  [0 U2 u. t( v7 i6 T) A
    set intersection? false
6 p. w! S6 g; _: `) W' y+ B4 }; c+ ]/ U  n' U    set auto? false
5 Z% f- ~( n7 Z7 l8 L, p# G    set green-light-up? true
) N1 _. o/ ~0 P8 A3 H2 ~! H5 p    set my-row -1) m' z$ x& \4 Y/ d8 Y5 l
    set my-column -1$ _' M% ^6 `* B# m3 E
    set my-phase -1
- d8 v( c6 l1 z7 i! M. x    set pcolor brown + 3( G3 ?# T$ c" u1 ~. }# w
  ]( u9 R9 @. C' N- ]& C7 o6 N

2 t& _2 L. A6 }$ `  B0 U, M) j( H! a  ;; initialize the global variables that hold patch agentsets
8 z1 \% U7 N& D% @" l  set roads patches with- E$ W8 @' ]/ T. `# ~+ M. A" q/ ]
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 r( n' f! V% c0 ?) N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. s: J( D, D1 E; s, p9 N5 V2 X9 f
  set intersections roads with
6 c5 l8 P/ d0 b) q, P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) z0 I# a* ]6 H5 G  r% S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ L. N( X! v' [2 a
3 l9 g5 Q- C  h/ h7 s4 O
  ask roads [ set pcolor white ]
6 {! y& x; n" Y0 F- K    setup-intersections7 M; @" ]0 N% P2 F% v- M8 N% K
end
" u; H6 T' O  h3 s+ q& W其中定义道路的句子,如下所示,是什么意思啊?  W8 @# X0 c/ q& n3 \% T+ E/ V
set roads patches with
- R$ o7 G- N/ q7 x3 ?8 l' Z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 k& E. B1 ]* \+ i- n" Z# t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 K/ i: _& E% [' U
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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