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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。
6 G0 s8 B6 F% N, }4 u+ Knetlogo自带的social science--traffic grid这一例子当中,
, W. {1 |- M0 Q7 ~# [( U) Gglobals
8 o! F( U' t: N1 ~: H0 u* t[
2 o) I$ X* I: v( R7 b1 j7 V  grid-x-inc               ;; the amount of patches in between two roads in the x direction
$ w) J7 n; ^/ a  U  grid-y-inc               ;; the amount of patches in between two roads in the y direction% G$ F: I2 V  D0 |9 `9 I) [' p( H
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ n2 M$ ?  U: d1 @) _/ b% N
                           ;; it is to accelerate or decelerate
2 b" N- I) j7 u) u  phase                    ;; keeps track of the phase2 j7 f! `  y9 l/ I" [- d; C- j
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
7 e1 x  n4 Q: L) `! Q  current-light            ;; the currently selected light
( K6 _3 l5 v' }' x
0 c4 N; s3 Q( B3 Z  ;; patch agentsets
" M/ z) ^9 P) u) f: g3 k  intersections ;; agentset containing the patches that are intersections; r: _$ U. p. F! o2 C7 I
  roads         ;; agentset containing the patches that are roads- X! j/ P% L, ?7 G2 \: |: W1 L
]( q9 i3 |, H  z3 \  }7 t

# ~2 o: J# B9 n9 m0 Eturtles-own5 s/ p% W* m$ D" r
[2 t( B) _# R* n$ E
  speed     ;; the speed of the turtle
- U' f1 h2 F- j+ F  up-car?   ;; true if the turtle moves downwards and false if it moves to the right/ |) M, M) @! @2 u
  wait-time ;; the amount of time since the last time a turtle has moved
" ?2 k# ]0 p  w, N2 q$ W2 Y+ J]
. m9 z" U5 X8 i0 X  \8 t
' K: _& _# W" rpatches-own! ^* E; B8 |) F6 }% V  d& ^
[
; g6 ~1 y9 ]8 q( O9 x, S  intersection?   ;; true if the patch is at the intersection of two roads
3 m( k* }- q/ |" }  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  a! x# h, k( W( U  Z/ n, }7 O                  ;; false for a non-intersection patches.3 f2 ~- [! C0 j0 P' I
  my-row          ;; the row of the intersection counting from the upper left corner of the
% K- Z: K8 M) T# r9 h                  ;; world.  -1 for non-intersection patches.+ A6 ?3 ?( N: v5 X  O3 q
  my-column       ;; the column of the intersection counting from the upper left corner of the/ L+ Y5 Q) ^' }" j  f
                  ;; world.  -1 for non-intersection patches.: L- ^' o: x! z  F( q. R
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ q' Z7 E/ s' W2 f6 f% a
  auto?           ;; whether or not this intersection will switch automatically.
5 _% Y4 @9 c  S0 E* E9 x: L! `                  ;; false for non-intersection patches.
4 O% [7 a! q% o6 Q( S. X/ z]1 Q: o1 u. E5 M8 [/ b$ E! T

) _5 m# d2 O% E; X- x
$ A& j# |9 z& a' a;;;;;;;;;;;;;;;;;;;;;;, P1 ~4 h8 b* F- {& i- I
;; Setup Procedures ;;
% `; [* k9 B5 }. y! P: [: \7 g& E/ |;;;;;;;;;;;;;;;;;;;;;;0 c1 `% B$ d$ S3 L( M3 v

, \6 }8 J9 C: p  v. ]% `" L;; Initialize the display by giving the global and patch variables initial values.
- H1 \; l+ z+ c" n7 z;; Create num-cars of turtles if there are enough road patches for one turtle to
& L0 N- o# T% d, K" r+ |;; be created per road patch. Set up the plots.
4 T& G1 X' @) W; T8 g" @to setup  {; V/ I4 P5 v5 \, }' N! g5 B
  ca
- A. s/ N5 V: D" K+ x  setup-globals: a2 c! x6 R' @4 F2 r" R
# j0 w" R; Q  k- P
  ;; First we ask the patches to draw themselves and set up a few variables
6 z1 @/ n. |/ ^3 E8 F  setup-patches
1 t) Y, s+ e  B8 V  make-current one-of intersections
, q/ l) a7 o  e4 d- @; k  label-current, U) b# y5 y  E  x! ]

& w0 F# U% R$ M  set-default-shape turtles "car"
6 ^: i" H1 |1 Z" Z% U8 Z; D  j' e: P( [! k
  if (num-cars > count roads)
9 c0 [0 V, ?  e' z8 a  [( U. H6 u5 X# ]- p
    user-message (word "There are too many cars for the amount of "" N. O: k( n$ {7 Q
                       "road.  Either increase the amount of roads "3 ~$ z' {; E/ R1 K( U- v7 }
                       "by increasing the GRID-SIZE-X or "
3 L( M! D# J$ m                       "GRID-SIZE-Y sliders, or decrease the "
  Y6 M1 _2 ?# ^1 b+ D. N                       "number of cars by lowering the NUMBER slider.\n"" }6 p( X' W* g- Z: V9 w/ x" U; d$ n
                       "The setup has stopped.")/ k4 V" e; Y/ F/ B& X
    stop. U# R$ q; t! N6 P" ?* i. _
  ]1 [. ^' u4 r/ @! s- F/ K, ?# ?
& |/ W; ?$ M+ \$ P' }
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 d( {. B; H' K1 \  crt num-cars
! d- ^9 Q: c7 s$ W  [
9 r1 Y# T; r/ S* g    setup-cars
) |; n7 J3 k" A& z+ Z* ^1 @    set-car-color2 N& _0 H# z) L$ v
    record-data) [, C, E4 V* w; r
  ]
: l8 I- L" _$ F1 ]: k* U
! L, F* ?% z8 X. I3 _# y2 N3 F4 [3 y  ;; give the turtles an initial speed& e7 D$ \! p. ^; Z7 d5 Q
  ask turtles [ set-car-speed ]
- P7 g; s' \) H% K8 ]4 P. ?0 x5 i% y% d! r) D
  reset-ticks
( L9 W: n3 U+ E( d$ Cend
) [% K+ }: E& U8 a! k: B. k1 K9 ]7 W+ A- p9 T
;; Initialize the global variables to appropriate values
+ h' C2 x3 o- R7 G1 ^) ito setup-globals# N: n" j8 ^- r* f! P* m
  set current-light nobody ;; just for now, since there are no lights yet
+ K- R9 _2 c! x  @2 C  set phase 09 h# Q* |  W" F* V$ ~9 G
  set num-cars-stopped 00 j: C6 ^! b2 o+ n/ L8 N% [
  set grid-x-inc world-width / grid-size-x) t5 k* j/ B6 a" ?" m+ u7 u  H
  set grid-y-inc world-height / grid-size-y
5 c2 q6 g- B% x0 K9 [/ @6 D! f" ]8 C+ [
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 e  T/ a# F, U2 k4 A, g  set acceleration 0.099/ ]" N. r. {7 s- d! {! r
end
3 [$ s! `0 k# b+ f1 G: {( F* B) z! J4 q9 ?
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. K3 S) m2 P( d/ L' I  ?$ u, R( J;; and initialize the traffic lights to one setting4 o4 ], y, {/ I  b! k6 {- @
to setup-patches
8 d& s. @' U/ j6 Y' m' L) q( L  ;; initialize the patch-owned variables and color the patches to a base-color
; q1 D9 m8 t2 W- E+ O. f  ask patches& p  [9 N" ~9 y# z) ?2 Z
  [8 ]" l/ ~; c; W$ B% f7 P/ V
    set intersection? false' J+ w% N& ?( `' F
    set auto? false
" D% f" l* x- Q4 ]* @    set green-light-up? true
: K8 j: ]7 \3 z# s    set my-row -1% w2 i1 M. s$ U9 f1 Y$ j" ~
    set my-column -1
5 d: _, [& w# X1 D    set my-phase -15 a( e& ]: g2 }2 P+ d8 \6 e
    set pcolor brown + 3  o6 L4 m8 J1 O8 i2 c
  ]
9 |' M# V0 ]6 F# W' a( a  H5 ?: H6 Q( K: n9 d
  ;; initialize the global variables that hold patch agentsets
% |! E  v; P% ~; ^5 a  set roads patches with
% X( |" f5 C$ |5 \    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 W: o( y. e: p7 M% o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ M& @4 y3 l5 A! Z( L: \, X  set intersections roads with8 L8 ?4 W% }* B3 c/ e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ H2 \( i0 H- O1 p3 v$ j4 s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# q8 {7 g) e# J( \/ q8 Q9 Y3 i+ w% E1 _4 d6 `8 z2 E
  ask roads [ set pcolor white ]
2 E6 b8 q+ E. S0 P& o3 f1 T# ?( y    setup-intersections6 C9 a) `0 J9 ], Y6 G3 F2 o4 l
end
$ _6 u, F0 ?& \/ G其中定义道路的句子,如下所示,是什么意思啊?: u7 l/ H8 j( ?4 _: g7 }9 ?
set roads patches with  b9 F9 R; w; z4 Y: j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; o& |9 a: v) A: [) m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# z7 b) f) C) i+ x0 w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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