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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。, d; P2 w( j' x& K. `$ j
netlogo自带的social science--traffic grid这一例子当中,
" c) ^) h, h/ y% r  o( {- X) gglobals4 G5 b1 G/ R' e0 O
[6 t1 e8 v0 E* P" |% D0 Z7 u
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
- I7 G) E4 M2 Q, J7 v  O  grid-y-inc               ;; the amount of patches in between two roads in the y direction
* j% s' [, o0 h  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 i- z0 u5 P  `/ D                           ;; it is to accelerate or decelerate0 ?4 A4 z  ~+ M+ y5 n6 S+ X
  phase                    ;; keeps track of the phase
$ R5 z1 Q9 Z; p0 [2 u  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ l  ?- D( A# L  ?6 M" I8 l  current-light            ;; the currently selected light# p4 v& z& n- u5 |/ v
; l2 N0 J0 l- ^' O
  ;; patch agentsets3 d: T' ^, ?! N
  intersections ;; agentset containing the patches that are intersections. e( ?) o3 B  Y
  roads         ;; agentset containing the patches that are roads
8 Z$ d5 W* N4 _' h, i! T]
7 V, @7 p% D- `% O" p9 D
: w1 |  I! F0 @4 e* ?turtles-own: s, U4 {9 p3 S9 a" ?5 W: n8 ~
[
& ]4 m+ R9 b$ v" X0 G  speed     ;; the speed of the turtle- Z5 w+ m$ t! a
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 ^0 J/ r- Y  |
  wait-time ;; the amount of time since the last time a turtle has moved+ l2 |5 B9 ?! d$ R! u
]
' M) N* r+ V5 P# M# Q. l/ w' _
8 }- V$ n! m& D2 @0 \: w# S! Jpatches-own
8 S9 ?2 f( ]4 _% ?[: F- L1 Y( |( _* ^% c8 P: D
  intersection?   ;; true if the patch is at the intersection of two roads
/ d; a6 s, @' Q/ `2 X. J; A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  k" U) [( `' ~8 A& y5 H7 o" h
                  ;; false for a non-intersection patches.6 e: J4 h0 K! [* w0 M" @, l) q: F
  my-row          ;; the row of the intersection counting from the upper left corner of the0 t! A1 z" l+ t, h3 P5 {+ B. I
                  ;; world.  -1 for non-intersection patches.
5 V# h$ N1 y# P  my-column       ;; the column of the intersection counting from the upper left corner of the1 V+ R; k: b) t9 i; ^2 I& S+ d% f
                  ;; world.  -1 for non-intersection patches.
% Y& i9 Q" m2 O& R$ u- D! Y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches." T* t7 |% L5 }
  auto?           ;; whether or not this intersection will switch automatically.; _/ `4 @, M+ D, g
                  ;; false for non-intersection patches.7 u2 |: O) @# b# G- H9 Q0 m$ J* w
]
0 V$ H- f& R4 Q2 r; ~* |
  S$ i& {' [% d# ^. k/ S/ M, K1 u! @" k7 h3 P7 y6 k% y
;;;;;;;;;;;;;;;;;;;;;;# a. M% D& `+ r# Q& R
;; Setup Procedures ;;
" i: m# w- V; ~1 v;;;;;;;;;;;;;;;;;;;;;;: Y' {6 F0 B: Y2 @( Y& `, A4 s% U

  Y3 L. ~2 H. v6 a;; Initialize the display by giving the global and patch variables initial values.
5 y% I% W: P5 {; F;; Create num-cars of turtles if there are enough road patches for one turtle to/ x& \. ~" M; a$ r) l$ t' j
;; be created per road patch. Set up the plots.8 l" t; [; ^+ k: U2 e, |
to setup( V0 ]3 v% a# F2 i3 `8 i
  ca
4 c2 N' y1 j# C$ w0 d& c1 L' h' C  setup-globals
: z" `  y) x. j7 T2 C( c# S: x9 `  @5 m3 o4 w$ B; ]% E& ?
  ;; First we ask the patches to draw themselves and set up a few variables, q1 m' V: J2 f- R7 i# R8 L
  setup-patches/ f9 y9 y' F( C) G. _
  make-current one-of intersections& k: ~2 r# e2 x% D5 S$ y
  label-current
1 d1 Z0 j. t! y" G( D4 C1 v% r' Q5 U" @5 |, _. a
  set-default-shape turtles "car") K6 U, C' `( Y* w; {

  Q- G; D: z& z" n7 z; ?  if (num-cars > count roads)
; j  _8 Y# i$ ?! i  [9 D$ }8 e* V9 D( r1 X/ k
    user-message (word "There are too many cars for the amount of "2 r2 x' N+ C! t0 O5 I
                       "road.  Either increase the amount of roads "1 M0 f& v/ C: [. n
                       "by increasing the GRID-SIZE-X or "
8 ?9 q+ J3 D$ O. Y" q                       "GRID-SIZE-Y sliders, or decrease the "& D1 [$ h) @7 `( E0 u& Y' x* f, t
                       "number of cars by lowering the NUMBER slider.\n", G) V7 t( s0 L! g
                       "The setup has stopped.")3 B# g+ V( K: }! ]$ o  N  W
    stop
; l3 ~' L. ?/ a: p  ]- j) Q- X8 G/ k

! e! L2 ~- u2 w  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 ?( V, c% t; b  crt num-cars( D) |) k9 b- H5 v9 Y
  [; v# ]* A* D$ {* F: ?3 x
    setup-cars+ |  M: O8 j) i0 j; s
    set-car-color6 a6 Z& o( `4 p% }( r
    record-data' R7 R3 X' g. ~/ R
  ]' G" T! w/ {% S2 u+ t; O4 k' H7 d
; X2 H" O1 a. G( W9 g8 i
  ;; give the turtles an initial speed
! e7 F. a( l2 }* u/ M- p) j6 k9 K  ask turtles [ set-car-speed ]( O' ~7 |2 i: [6 Y5 b; x; D

: [# K, F* Y: s4 m, \/ Z5 p  reset-ticks* `  M- ?# W( c5 |  U
end
$ P5 l9 j0 r/ C% n# \# ?
9 f* `6 ^; B* ^6 Y;; Initialize the global variables to appropriate values  V9 H& m( r3 f3 R" E/ r
to setup-globals! Z/ r9 U9 m4 J
  set current-light nobody ;; just for now, since there are no lights yet: a7 Q% g- q6 U+ f0 U1 c- u: z
  set phase 03 f  o6 X* H7 K: G, T, W$ p, T
  set num-cars-stopped 0
( p6 c7 L+ N* c: u( T8 N5 O  set grid-x-inc world-width / grid-size-x
  Q; t* |5 v! p/ C  set grid-y-inc world-height / grid-size-y% b) m* D' g$ Q  w2 F
" j" W' E+ S. i2 ^
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. M0 N" i* u" Q8 @1 d4 Z3 |
  set acceleration 0.099
; b2 l+ H: @  k. iend. o* ~- K8 X) S) n1 d8 b
! M* |# n% {- w2 x" P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 o: J6 U( {  y2 U) E
;; and initialize the traffic lights to one setting
! E, Y1 F0 v6 y, T- ~to setup-patches
, ]8 m3 C/ M- q* b4 v; S  ;; initialize the patch-owned variables and color the patches to a base-color+ J& j4 z' C9 m" X
  ask patches% m- C& ~1 ~- v8 b4 m
  [
/ c' W) J! ?3 F% v    set intersection? false: ]2 A6 n" K0 N6 i+ s( e3 y
    set auto? false
; z' ?2 L' r; W% B# _1 Y/ K6 `1 n    set green-light-up? true% f5 M: }9 `6 L: i! ]7 `$ T
    set my-row -1
; ^  ]$ P3 e. J# T    set my-column -11 R- C  v. q) x" p
    set my-phase -12 L0 h0 Y9 ?! s6 T
    set pcolor brown + 3
2 n. a. S% ~% N0 K, A$ S  ]4 K& `8 I( M. S- Z% h- Q' v" o, x

: s8 I& F8 }, [' A9 C$ G9 u0 u  ;; initialize the global variables that hold patch agentsets( O) \5 \$ ]! D8 A2 D, X* w
  set roads patches with* p" p4 U$ |7 K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# o9 Y) ]1 }& V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. u& Y. E- Y6 u2 m) l* p. I) G8 l5 r! O
  set intersections roads with; s  R* B6 R) D4 A! P% N8 ]
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ @  t6 e1 l& i1 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( `; t, F* \! j$ w, v& ^
. I" R6 i) _. J+ k
  ask roads [ set pcolor white ]1 X  A; P$ h1 P$ ?$ l9 O$ h
    setup-intersections/ r1 ~, J, |9 u' b) e
end
; i* ~" w& G8 Q3 N" Z; d其中定义道路的句子,如下所示,是什么意思啊?' K+ ^( k% B$ l
set roads patches with7 w  p/ z) h+ v# P
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, k" U* |( j/ N9 U" D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 ]& o. T# c! H) J; Q3 Z
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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