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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。
7 H& W. Z3 s0 `$ h/ ?, dnetlogo自带的social science--traffic grid这一例子当中,
9 X) c& s2 [  r3 @globals! u( G" K) y& d
[
8 U$ f% ^( a! H- h4 R- p7 ]  grid-x-inc               ;; the amount of patches in between two roads in the x direction$ _! e( Z5 R* E
  grid-y-inc               ;; the amount of patches in between two roads in the y direction5 a: p  P- N7 a# n; q
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
4 j; f: l  Q' w6 @' {8 p                           ;; it is to accelerate or decelerate
" Z9 J6 @+ ]$ y" Y  phase                    ;; keeps track of the phase
& E  m2 n. ^$ C  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ [& C* S+ L! {0 x% z$ o, W7 }8 e  current-light            ;; the currently selected light, {# V3 Q' G4 M5 Q' ?- ~/ l
1 @" x: H) _, ]- w
  ;; patch agentsets
! ]$ J4 B4 A, n1 s' q. \  intersections ;; agentset containing the patches that are intersections
( C' _4 H" @  T: t  j2 [  roads         ;; agentset containing the patches that are roads
; e9 ^; |+ }* ^3 _]% Z+ E6 V" r5 e

3 h0 P" J" d" X& A" ~$ o- F, Zturtles-own) B# K) N6 N4 S. g
[( P' o* G+ h4 {/ ?. Y1 y1 l! {
  speed     ;; the speed of the turtle, K2 ^; M, r8 r) H3 h% p
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
0 J7 e7 X7 O) d6 g  wait-time ;; the amount of time since the last time a turtle has moved- N% B" l9 O) |2 K
]
; ?% E5 e; \2 ?) N& l. }# k# E& f
patches-own
# O/ Q  a5 C: k# }% U[
  P& V! u9 h3 g6 M* j# v  intersection?   ;; true if the patch is at the intersection of two roads
" l# a, l" O7 n) h- x  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- s6 W+ I( g# u  ~% J  _
                  ;; false for a non-intersection patches.; a$ a% j* G% e& G9 y
  my-row          ;; the row of the intersection counting from the upper left corner of the
2 Y  y1 t8 R/ D0 I! R. P5 u# u+ E( U                  ;; world.  -1 for non-intersection patches.
8 q1 T; S& r$ `  p5 m  my-column       ;; the column of the intersection counting from the upper left corner of the
1 n8 t  N: g. p! M- L6 }$ J# d                  ;; world.  -1 for non-intersection patches.3 g- Y/ U0 \  U9 ^) B4 ], Y
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. x8 o# N* y0 q1 F4 v# i, `  x/ [  auto?           ;; whether or not this intersection will switch automatically.
! ~) o9 Y6 p+ I. O% n, T8 k3 D- R4 A7 \                  ;; false for non-intersection patches.
$ i( a; a3 a& S1 x7 ]- h' F( L]
, e5 V8 ?* J4 D5 S; G- ?( o
- y3 o# ~! Q8 l4 P
: f3 X/ E2 [6 F$ @) \6 c1 I! q;;;;;;;;;;;;;;;;;;;;;;
3 Q4 |3 |8 P0 k2 |/ e;; Setup Procedures ;;% L4 w3 _. x% u3 l" A! A, |3 S% g
;;;;;;;;;;;;;;;;;;;;;;$ s1 E# m. E6 l9 `
% p2 n3 T9 U5 I7 @% `  G1 T
;; Initialize the display by giving the global and patch variables initial values.2 J+ }% `- Q! z. G4 Q
;; Create num-cars of turtles if there are enough road patches for one turtle to
- H  }" h5 F+ w5 B; s) n;; be created per road patch. Set up the plots.
& t) w4 ?& _9 c' d% a. F$ [to setup$ \7 Z5 [& K( s# D4 h/ h
  ca% |, T# p  x3 X" X, @# d, @
  setup-globals
# K5 p  Y. J1 `/ \0 [. ^$ J) C" ~4 E/ S2 d: k
  ;; First we ask the patches to draw themselves and set up a few variables
3 o2 [. U. C; z7 r  setup-patches. ~1 E6 [* m& c2 E+ d3 @( l7 n* \
  make-current one-of intersections1 |" j) M1 K7 n. V0 t
  label-current! C/ V& J3 x( o+ w% o& v0 S
/ f7 ?; W" \% n. `- v9 k) ^
  set-default-shape turtles "car"
! p8 J; ^, F. G# G: E/ _5 m/ B! U+ V( F8 Q/ \. y# A
  if (num-cars > count roads)6 E0 L8 z8 F8 T. z2 r/ A+ M
  [/ K; X- s! V6 B4 g4 k
    user-message (word "There are too many cars for the amount of "7 L& w9 ?* b! r5 f" x6 n( F' `
                       "road.  Either increase the amount of roads "
- j! ]+ ^- R5 K1 S7 O1 z                       "by increasing the GRID-SIZE-X or "
1 [& \) N! k. T4 N+ A9 o                       "GRID-SIZE-Y sliders, or decrease the "( N) j& ?! l# o* @
                       "number of cars by lowering the NUMBER slider.\n"
5 j6 ~2 `9 E/ A( W0 J5 z% B                       "The setup has stopped.")
; g1 H( y/ @0 Q( O6 J( S- _    stop  g/ S: L5 E; K" _
  ]& q: q3 L4 G: ^+ M( t
9 w8 a$ H$ `, a, m1 n3 [5 F
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. Z% B$ L0 M0 N. L' Z3 r) i  crt num-cars
. P' o; X4 j, G$ E! [/ K# N! ~0 x/ {  [
3 @1 j1 ^& P- c/ K; j$ ?    setup-cars
) i# t# ?- V" t$ [    set-car-color! j$ j1 E$ {. M2 M: D7 b
    record-data6 R3 f% @: p: z% P
  ]0 U9 n: E9 D7 ]' M0 I

, r2 M0 v: I5 G. f2 o  E: e' Z  ;; give the turtles an initial speed' D. J" g3 d, U
  ask turtles [ set-car-speed ]. `3 e6 {/ {# d" U
" x  d# P( H' p. v3 @% j
  reset-ticks! \! b8 v  n/ g/ p5 v$ b
end8 G6 Q, E2 ~# x0 M" v5 Q- ^# N  c5 j4 N

& m6 {" O& n* m;; Initialize the global variables to appropriate values
4 X& K; c9 s. \1 w. wto setup-globals
2 @0 ^* T4 r+ P$ x! K) ^  set current-light nobody ;; just for now, since there are no lights yet
8 q( q; ~- \- x7 f9 X  set phase 0, J/ V" G, w8 q) K
  set num-cars-stopped 0* P3 N$ z3 R/ o
  set grid-x-inc world-width / grid-size-x
. N; C' o! k  B6 [: [  set grid-y-inc world-height / grid-size-y( u7 |+ Y$ |8 B2 N( @8 z

: r7 V* P0 h$ e' G# s% Z6 L- g3 N  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# J6 L$ R/ g& R2 e1 K% T  set acceleration 0.099. I( n( I0 q2 z9 [
end
# j* k6 x9 o, J7 H: x0 Z5 _: P8 c* O! P/ O2 f, e2 ~% |+ I
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. e% W# S3 u% U- |" Y) w$ _+ ]. O
;; and initialize the traffic lights to one setting
5 J) P9 `8 s2 u4 T4 v! Rto setup-patches
" J5 l6 I- ~, L) |. H! X! @0 W  ;; initialize the patch-owned variables and color the patches to a base-color! B! j  k0 X9 W' _8 S
  ask patches' S8 G$ i. |, M
  [% p& ]" V7 |! R" N& V" E, ^" a! t3 f
    set intersection? false5 K  x9 C+ M! |9 K/ m9 N1 o4 g
    set auto? false5 E8 ^, G3 C: \- L. f
    set green-light-up? true
0 G/ N$ a$ p- K8 y, Q' t    set my-row -18 v. c& z. {' R9 V6 g
    set my-column -1
& }7 `4 \! ?8 r. B! K    set my-phase -1* D" ~% a% ]8 S. S/ p  E& O- k! o% @3 s
    set pcolor brown + 3, `6 ?5 |1 S+ G: c  \; D9 [
  ]( z1 R) h9 ]4 \
* E  g, a7 C5 G" q" }; s
  ;; initialize the global variables that hold patch agentsets! U9 Y: ~: B$ @8 l$ V1 S3 a
  set roads patches with+ o; g  B( _4 t1 C5 M* L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" a- {( w; y3 R! }1 R* c! y/ L2 X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 E4 J: i  b# r% H3 r& Y2 b  set intersections roads with; D( d8 @. w! u* n8 I: x0 P
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; E6 n7 I9 {; O8 q* q+ y2 o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 k8 e- G1 @' F7 ~1 s9 B
9 Z+ n' Q# K, f% b  ask roads [ set pcolor white ]
7 k/ e) @" `; R) K/ Z9 o4 s) X! `    setup-intersections
: u9 p2 |1 z2 y* N/ r' ~& Z7 Wend
6 J" N! e8 j. a8 l0 Y) g其中定义道路的句子,如下所示,是什么意思啊?
0 |+ W0 T& c$ }  q* R% U set roads patches with1 Z$ ]* `  A8 X  F  l3 Y. O3 ^* k
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: E; U& k8 Z: c! K3 E7 a! f. P3 P
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, S& \( D) J. e- u  b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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